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<h1>wcs.h</h1><a href="wcs_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*============================================================================</span>
<a name="l00002"></a>00002 <span class="comment"></span>
<a name="l00003"></a>00003 <span class="comment"> WCSLIB 4.8 - an implementation of the FITS WCS standard.</span>
<a name="l00004"></a>00004 <span class="comment"> Copyright (C) 1995-2011, Mark Calabretta</span>
<a name="l00005"></a>00005 <span class="comment"></span>
<a name="l00006"></a>00006 <span class="comment"> This file is part of WCSLIB.</span>
<a name="l00007"></a>00007 <span class="comment"></span>
<a name="l00008"></a>00008 <span class="comment"> WCSLIB is free software: you can redistribute it and/or modify it under the</span>
<a name="l00009"></a>00009 <span class="comment"> terms of the GNU Lesser General Public License as published by the Free</span>
<a name="l00010"></a>00010 <span class="comment"> Software Foundation, either version 3 of the License, or (at your option)</span>
<a name="l00011"></a>00011 <span class="comment"> any later version.</span>
<a name="l00012"></a>00012 <span class="comment"></span>
<a name="l00013"></a>00013 <span class="comment"> WCSLIB is distributed in the hope that it will be useful, but WITHOUT ANY</span>
<a name="l00014"></a>00014 <span class="comment"> WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS</span>
<a name="l00015"></a>00015 <span class="comment"> FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for</span>
<a name="l00016"></a>00016 <span class="comment"> more details.</span>
<a name="l00017"></a>00017 <span class="comment"></span>
<a name="l00018"></a>00018 <span class="comment"> You should have received a copy of the GNU Lesser General Public License</span>
<a name="l00019"></a>00019 <span class="comment"> along with WCSLIB. If not, see <http://www.gnu.org/licenses/>.</span>
<a name="l00020"></a>00020 <span class="comment"></span>
<a name="l00021"></a>00021 <span class="comment"> Correspondence concerning WCSLIB may be directed to:</span>
<a name="l00022"></a>00022 <span class="comment"> Internet email: mcalabre@atnf.csiro.au</span>
<a name="l00023"></a>00023 <span class="comment"> Postal address: Dr. Mark Calabretta</span>
<a name="l00024"></a>00024 <span class="comment"> Australia Telescope National Facility, CSIRO</span>
<a name="l00025"></a>00025 <span class="comment"> PO Box 76</span>
<a name="l00026"></a>00026 <span class="comment"> Epping NSW 1710</span>
<a name="l00027"></a>00027 <span class="comment"> AUSTRALIA</span>
<a name="l00028"></a>00028 <span class="comment"></span>
<a name="l00029"></a>00029 <span class="comment"> Author: Mark Calabretta, Australia Telescope National Facility</span>
<a name="l00030"></a>00030 <span class="comment"> http://www.atnf.csiro.au/~mcalabre/index.html</span>
<a name="l00031"></a>00031 <span class="comment"> $Id: wcs.h,v 4.8.1.1 2011/08/15 08:07:06 cal103 Exp cal103 $</span>
<a name="l00032"></a>00032 <span class="comment">*=============================================================================</span>
<a name="l00033"></a>00033 <span class="comment">*</span>
<a name="l00034"></a>00034 <span class="comment">* WCSLIB 4.8 - C routines that implement the FITS World Coordinate System</span>
<a name="l00035"></a>00035 <span class="comment">* (WCS) standard. Refer to</span>
<a name="l00036"></a>00036 <span class="comment">*</span>
<a name="l00037"></a>00037 <span class="comment">* "Representations of world coordinates in FITS",</span>
<a name="l00038"></a>00038 <span class="comment">* Greisen, E.W., & Calabretta, M.R. 2002, A&A, 395, 1061 (Paper I)</span>
<a name="l00039"></a>00039 <span class="comment">*</span>
<a name="l00040"></a>00040 <span class="comment">* "Representations of celestial coordinates in FITS",</span>
<a name="l00041"></a>00041 <span class="comment">* Calabretta, M.R., & Greisen, E.W. 2002, A&A, 395, 1077 (Paper II)</span>
<a name="l00042"></a>00042 <span class="comment">*</span>
<a name="l00043"></a>00043 <span class="comment">* "Representations of spectral coordinates in FITS",</span>
<a name="l00044"></a>00044 <span class="comment">* Greisen, E.W., Calabretta, M.R., Valdes, F.G., & Allen, S.L.</span>
<a name="l00045"></a>00045 <span class="comment">* 2006, A&A, 446, 747 (Paper III)</span>
<a name="l00046"></a>00046 <span class="comment">*</span>
<a name="l00047"></a>00047 <span class="comment">* Refer to the README file provided with WCSLIB for an overview of the</span>
<a name="l00048"></a>00048 <span class="comment">* library.</span>
<a name="l00049"></a>00049 <span class="comment">*</span>
<a name="l00050"></a>00050 <span class="comment">*</span>
<a name="l00051"></a>00051 <span class="comment">* Summary of the wcs routines</span>
<a name="l00052"></a>00052 <span class="comment">* ---------------------------</span>
<a name="l00053"></a>00053 <span class="comment">* These routines implement the FITS World Coordinate System (WCS) standard</span>
<a name="l00054"></a>00054 <span class="comment">* which defines methods to be used for computing world coordinates from image</span>
<a name="l00055"></a>00055 <span class="comment">* pixel coordinates, and vice versa. They are based on the wcsprm struct</span>
<a name="l00056"></a>00056 <span class="comment">* which contains all information needed for the computations. The struct</span>
<a name="l00057"></a>00057 <span class="comment">* contains some members that must be set by the user, and others that are</span>
<a name="l00058"></a>00058 <span class="comment">* maintained by these routines, somewhat like a C++ class but with no</span>
<a name="l00059"></a>00059 <span class="comment">* encapsulation.</span>
<a name="l00060"></a>00060 <span class="comment">*</span>
<a name="l00061"></a>00061 <span class="comment">* Three routines, wcsini(), wcssub(), and wcsfree() are provided to manage the</span>
<a name="l00062"></a>00062 <span class="comment">* wcsprm struct and another, wcsprt(), to prints its contents. Refer to the</span>
<a name="l00063"></a>00063 <span class="comment">* description of the wcsprm struct for an explanation of the anticipated usage</span>
<a name="l00064"></a>00064 <span class="comment">* of these routines. wcscopy(), which does a deep copy of one wcsprm struct</span>
<a name="l00065"></a>00065 <span class="comment">* to another, is defined as a preprocessor macro function that invokes</span>
<a name="l00066"></a>00066 <span class="comment">* wcssub().</span>
<a name="l00067"></a>00067 <span class="comment">*</span>
<a name="l00068"></a>00068 <span class="comment">* wcsperr() prints the error message(s) (if any) stored in a wcsprm struct,</span>
<a name="l00069"></a>00069 <span class="comment">* and the linprm, celprm, prjprm, spcprm, and tabprm structs that it contains.</span>
<a name="l00070"></a>00070 <span class="comment">*</span>
<a name="l00071"></a>00071 <span class="comment">* A setup routine, wcsset(), computes intermediate values in the wcsprm struct</span>
<a name="l00072"></a>00072 <span class="comment">* from parameters in it that were supplied by the user. The struct always</span>
<a name="l00073"></a>00073 <span class="comment">* needs to be set up by wcsset() but this need not be called explicitly -</span>
<a name="l00074"></a>00074 <span class="comment">* refer to the explanation of wcsprm::flag.</span>
<a name="l00075"></a>00075 <span class="comment">*</span>
<a name="l00076"></a>00076 <span class="comment">* wcsp2s() and wcss2p() implement the WCS world coordinate transformations.</span>
<a name="l00077"></a>00077 <span class="comment">* In fact, they are high level driver routines for the WCS linear,</span>
<a name="l00078"></a>00078 <span class="comment">* logarithmic, celestial, spectral and tabular transformation routines</span>
<a name="l00079"></a>00079 <span class="comment">* described in lin.h, log.h, cel.h, spc.h and tab.h.</span>
<a name="l00080"></a>00080 <span class="comment">*</span>
<a name="l00081"></a>00081 <span class="comment">* Given either the celestial longitude or latitude plus an element of the</span>
<a name="l00082"></a>00082 <span class="comment">* pixel coordinate a hybrid routine, wcsmix(), iteratively solves for the</span>
<a name="l00083"></a>00083 <span class="comment">* unknown elements.</span>
<a name="l00084"></a>00084 <span class="comment">*</span>
<a name="l00085"></a>00085 <span class="comment">* wcssptr() translates the spectral axis in a wcsprm struct. For example, a</span>
<a name="l00086"></a>00086 <span class="comment">* 'FREQ' axis may be translated into 'ZOPT-F2W' and vice versa.</span>
<a name="l00087"></a>00087 <span class="comment">*</span>
<a name="l00088"></a>00088 <span class="comment">* Quadcube projections:</span>
<a name="l00089"></a>00089 <span class="comment">* ---------------------</span>
<a name="l00090"></a>00090 <span class="comment">* The quadcube projections (TSC, CSC, QSC) may be represented in FITS in</span>
<a name="l00091"></a>00091 <span class="comment">* either of two ways:</span>
<a name="l00092"></a>00092 <span class="comment">*</span>
<a name="l00093"></a>00093 <span class="comment">* a: The six faces may be laid out in one plane and numbered as follows:</span>
<a name="l00094"></a>00094 <span class="comment">*</span>
<a name="l00095"></a>00095 <span class="comment">= 0</span>
<a name="l00096"></a>00096 <span class="comment">=</span>
<a name="l00097"></a>00097 <span class="comment">= 4 3 2 1 4 3 2</span>
<a name="l00098"></a>00098 <span class="comment">=</span>
<a name="l00099"></a>00099 <span class="comment">= 5</span>
<a name="l00100"></a>00100 <span class="comment">*</span>
<a name="l00101"></a>00101 <span class="comment">* Faces 2, 3 and 4 may appear on one side or the other (or both). The</span>
<a name="l00102"></a>00102 <span class="comment">* world-to-pixel routines map faces 2, 3 and 4 to the left but the</span>
<a name="l00103"></a>00103 <span class="comment">* pixel-to-world routines accept them on either side.</span>
<a name="l00104"></a>00104 <span class="comment">*</span>
<a name="l00105"></a>00105 <span class="comment">* b: The "COBE" convention in which the six faces are stored in a</span>
<a name="l00106"></a>00106 <span class="comment">* three-dimensional structure using a CUBEFACE axis indexed from</span>
<a name="l00107"></a>00107 <span class="comment">* 0 to 5 as above.</span>
<a name="l00108"></a>00108 <span class="comment">*</span>
<a name="l00109"></a>00109 <span class="comment">* These routines support both methods; wcsset() determines which is being</span>
<a name="l00110"></a>00110 <span class="comment">* used by the presence or absence of a CUBEFACE axis in ctype[]. wcsp2s()</span>
<a name="l00111"></a>00111 <span class="comment">* and wcss2p() translate the CUBEFACE axis representation to the single</span>
<a name="l00112"></a>00112 <span class="comment">* plane representation understood by the lower-level WCSLIB projection</span>
<a name="l00113"></a>00113 <span class="comment">* routines.</span>
<a name="l00114"></a>00114 <span class="comment">*</span>
<a name="l00115"></a>00115 <span class="comment">*</span>
<a name="l00116"></a>00116 <span class="comment">* wcsini() - Default constructor for the wcsprm struct</span>
<a name="l00117"></a>00117 <span class="comment">* ----------------------------------------------------</span>
<a name="l00118"></a>00118 <span class="comment">* wcsini() optionally allocates memory for arrays in a wcsprm struct and sets</span>
<a name="l00119"></a>00119 <span class="comment">* all members of the struct to default values. Memory is allocated for up to</span>
<a name="l00120"></a>00120 <span class="comment">* NPVMAX PVi_ma keywords or NPSMAX PSi_ma keywords per WCS representation.</span>
<a name="l00121"></a>00121 <span class="comment">* These may be changed via wcsnpv() and wcsnps() before wcsini() is called.</span>
<a name="l00122"></a>00122 <span class="comment">*</span>
<a name="l00123"></a>00123 <span class="comment">* PLEASE NOTE: every wcsprm struct should be initialized by wcsini(), possibly</span>
<a name="l00124"></a>00124 <span class="comment">* repeatedly. On the first invokation, and only the first invokation,</span>
<a name="l00125"></a>00125 <span class="comment">* wcsprm::flag must be set to -1 to initialize memory management, regardless</span>
<a name="l00126"></a>00126 <span class="comment">* of whether wcsini() will actually be used to allocate memory.</span>
<a name="l00127"></a>00127 <span class="comment">*</span>
<a name="l00128"></a>00128 <span class="comment">* Given:</span>
<a name="l00129"></a>00129 <span class="comment">* alloc int If true, allocate memory unconditionally for the</span>
<a name="l00130"></a>00130 <span class="comment">* crpix, etc. arrays.</span>
<a name="l00131"></a>00131 <span class="comment">*</span>
<a name="l00132"></a>00132 <span class="comment">* If false, it is assumed that pointers to these arrays</span>
<a name="l00133"></a>00133 <span class="comment">* have been set by the user except if they are null</span>
<a name="l00134"></a>00134 <span class="comment">* pointers in which case memory will be allocated for</span>
<a name="l00135"></a>00135 <span class="comment">* them regardless. (In other words, setting alloc true</span>
<a name="l00136"></a>00136 <span class="comment">* saves having to initalize these pointers to zero.)</span>
<a name="l00137"></a>00137 <span class="comment">*</span>
<a name="l00138"></a>00138 <span class="comment">* naxis int The number of world coordinate axes. This is used to</span>
<a name="l00139"></a>00139 <span class="comment">* determine the length of the various wcsprm vectors and</span>
<a name="l00140"></a>00140 <span class="comment">* matrices and therefore the amount of memory to</span>
<a name="l00141"></a>00141 <span class="comment">* allocate for them.</span>
<a name="l00142"></a>00142 <span class="comment">*</span>
<a name="l00143"></a>00143 <span class="comment">* Given and returned:</span>
<a name="l00144"></a>00144 <span class="comment">* wcs struct wcsprm*</span>
<a name="l00145"></a>00145 <span class="comment">* Coordinate transformation parameters.</span>
<a name="l00146"></a>00146 <span class="comment">*</span>
<a name="l00147"></a>00147 <span class="comment">* Note that, in order to initialize memory management,</span>
<a name="l00148"></a>00148 <span class="comment">* wcsprm::flag should be set to -1 when wcs is</span>
<a name="l00149"></a>00149 <span class="comment">* initialized for the first time (memory leaks may</span>
<a name="l00150"></a>00150 <span class="comment">* result if it had already been initialized).</span>
<a name="l00151"></a>00151 <span class="comment">*</span>
<a name="l00152"></a>00152 <span class="comment">* Function return value:</span>
<a name="l00153"></a>00153 <span class="comment">* int Status return value:</span>
<a name="l00154"></a>00154 <span class="comment">* 0: Success.</span>
<a name="l00155"></a>00155 <span class="comment">* 1: Null wcsprm pointer passed.</span>
<a name="l00156"></a>00156 <span class="comment">* 2: Memory allocation failed.</span>
<a name="l00157"></a>00157 <span class="comment">*</span>
<a name="l00158"></a>00158 <span class="comment">* For returns > 1, a detailed error message is set in</span>
<a name="l00159"></a>00159 <span class="comment">* wcsprm::err if enabled, see wcserr_enable().</span>
<a name="l00160"></a>00160 <span class="comment">*</span>
<a name="l00161"></a>00161 <span class="comment">*</span>
<a name="l00162"></a>00162 <span class="comment">* wcsnpv() - Memory allocation for PVi_ma</span>
<a name="l00163"></a>00163 <span class="comment">* ---------------------------------------</span>
<a name="l00164"></a>00164 <span class="comment">* wcsnpv() changes the value of NPVMAX (default 64). This global variable</span>
<a name="l00165"></a>00165 <span class="comment">* controls the number of PVi_ma keywords that wcsini() should allocate space</span>
<a name="l00166"></a>00166 <span class="comment">* for.</span>
<a name="l00167"></a>00167 <span class="comment">*</span>
<a name="l00168"></a>00168 <span class="comment">* PLEASE NOTE: This function is not thread-safe.</span>
<a name="l00169"></a>00169 <span class="comment">*</span>
<a name="l00170"></a>00170 <span class="comment">* Given:</span>
<a name="l00171"></a>00171 <span class="comment">* n int Value of NPVMAX; ignored if < 0.</span>
<a name="l00172"></a>00172 <span class="comment">*</span>
<a name="l00173"></a>00173 <span class="comment">* Function return value:</span>
<a name="l00174"></a>00174 <span class="comment">* int Current value of NPVMAX.</span>
<a name="l00175"></a>00175 <span class="comment">*</span>
<a name="l00176"></a>00176 <span class="comment">*</span>
<a name="l00177"></a>00177 <span class="comment">* wcsnps() - Memory allocation for PSi_ma</span>
<a name="l00178"></a>00178 <span class="comment">* ---------------------------------------</span>
<a name="l00179"></a>00179 <span class="comment">* wcsnps() changes the values of NPSMAX (default 8). This global variable</span>
<a name="l00180"></a>00180 <span class="comment">* controls the number of PSi_ma keywords that wcsini() should allocate space</span>
<a name="l00181"></a>00181 <span class="comment">* for.</span>
<a name="l00182"></a>00182 <span class="comment">*</span>
<a name="l00183"></a>00183 <span class="comment">* PLEASE NOTE: This function is not thread-safe.</span>
<a name="l00184"></a>00184 <span class="comment">*</span>
<a name="l00185"></a>00185 <span class="comment">* Given:</span>
<a name="l00186"></a>00186 <span class="comment">* n int Value of NPSMAX; ignored if < 0.</span>
<a name="l00187"></a>00187 <span class="comment">*</span>
<a name="l00188"></a>00188 <span class="comment">* Function return value:</span>
<a name="l00189"></a>00189 <span class="comment">* int Current value of NPSMAX.</span>
<a name="l00190"></a>00190 <span class="comment">*</span>
<a name="l00191"></a>00191 <span class="comment">*</span>
<a name="l00192"></a>00192 <span class="comment">* wcssub() - Subimage extraction routine for the wcsprm struct</span>
<a name="l00193"></a>00193 <span class="comment">* ------------------------------------------------------------</span>
<a name="l00194"></a>00194 <span class="comment">* wcssub() extracts the coordinate description for a subimage from a wcsprm</span>
<a name="l00195"></a>00195 <span class="comment">* struct. It does a deep copy, using wcsini() to allocate memory for its</span>
<a name="l00196"></a>00196 <span class="comment">* arrays if required. Only the "information to be provided" part of the</span>
<a name="l00197"></a>00197 <span class="comment">* struct is extracted; a call to wcsset() is required to set up the remainder.</span>
<a name="l00198"></a>00198 <span class="comment">*</span>
<a name="l00199"></a>00199 <span class="comment">* The world coordinate system of the subimage must be separable in the sense</span>
<a name="l00200"></a>00200 <span class="comment">* that the world coordinates at any point in the subimage must depend only on</span>
<a name="l00201"></a>00201 <span class="comment">* the pixel coordinates of the axes extracted. In practice, this means that</span>
<a name="l00202"></a>00202 <span class="comment">* the PCi_ja matrix of the original image must not contain non-zero</span>
<a name="l00203"></a>00203 <span class="comment">* off-diagonal terms that associate any of the subimage axes with any of the</span>
<a name="l00204"></a>00204 <span class="comment">* non-subimage axes.</span>
<a name="l00205"></a>00205 <span class="comment">*</span>
<a name="l00206"></a>00206 <span class="comment">* Note that while the required elements of the tabprm array are extracted, the</span>
<a name="l00207"></a>00207 <span class="comment">* wtbarr array is not. (Thus it is not appropriate to call wcssub() after</span>
<a name="l00208"></a>00208 <span class="comment">* wcstab() but before filling the tabprm structs - refer to wcshdr.h.)</span>
<a name="l00209"></a>00209 <span class="comment">*</span>
<a name="l00210"></a>00210 <span class="comment">* Given:</span>
<a name="l00211"></a>00211 <span class="comment">* alloc int If true, allocate memory for the crpix, etc. arrays in</span>
<a name="l00212"></a>00212 <span class="comment">* the destination. Otherwise, it is assumed that</span>
<a name="l00213"></a>00213 <span class="comment">* pointers to these arrays have been set by the user</span>
<a name="l00214"></a>00214 <span class="comment">* except if they are null pointers in which case memory</span>
<a name="l00215"></a>00215 <span class="comment">* will be allocated for them regardless.</span>
<a name="l00216"></a>00216 <span class="comment">*</span>
<a name="l00217"></a>00217 <span class="comment">* wcssrc const struct wcsprm*</span>
<a name="l00218"></a>00218 <span class="comment">* Struct to extract from.</span>
<a name="l00219"></a>00219 <span class="comment">*</span>
<a name="l00220"></a>00220 <span class="comment">* Given and returned:</span>
<a name="l00221"></a>00221 <span class="comment">* nsub int*</span>
<a name="l00222"></a>00222 <span class="comment">* axes int[] Vector of length *nsub containing the image axis</span>
<a name="l00223"></a>00223 <span class="comment">* numbers (1-relative) to extract. Order is</span>
<a name="l00224"></a>00224 <span class="comment">* significant; axes[0] is the axis number of the input</span>
<a name="l00225"></a>00225 <span class="comment">* image that corresponds to the first axis in the</span>
<a name="l00226"></a>00226 <span class="comment">* subimage, etc.</span>
<a name="l00227"></a>00227 <span class="comment">*</span>
<a name="l00228"></a>00228 <span class="comment">* nsub (the pointer) may be set to zero, and so also may</span>
<a name="l00229"></a>00229 <span class="comment">* nsub, to indicate the number of axes in the input</span>
<a name="l00230"></a>00230 <span class="comment">* image; the number of axes will be returned if</span>
<a name="l00231"></a>00231 <span class="comment">* nsub != 0. axes itself (the pointer) may be set to</span>
<a name="l00232"></a>00232 <span class="comment">* zero to indicate the first *nsub axes in their</span>
<a name="l00233"></a>00233 <span class="comment">* original order.</span>
<a name="l00234"></a>00234 <span class="comment">*</span>
<a name="l00235"></a>00235 <span class="comment">* Set both nsub and axes to zero to do a deep copy of</span>
<a name="l00236"></a>00236 <span class="comment">* one wcsprm struct to another.</span>
<a name="l00237"></a>00237 <span class="comment">*</span>
<a name="l00238"></a>00238 <span class="comment">* Subimage extraction by coordinate axis type may be</span>
<a name="l00239"></a>00239 <span class="comment">* done by setting the elements of axes[] to the</span>
<a name="l00240"></a>00240 <span class="comment">* following special preprocessor macro values:</span>
<a name="l00241"></a>00241 <span class="comment">*</span>
<a name="l00242"></a>00242 <span class="comment">* WCSSUB_LONGITUDE: Celestial longitude.</span>
<a name="l00243"></a>00243 <span class="comment">* WCSSUB_LATITUDE: Celestial latitude.</span>
<a name="l00244"></a>00244 <span class="comment">* WCSSUB_CUBEFACE: Quadcube CUBEFACE axis.</span>
<a name="l00245"></a>00245 <span class="comment">* WCSSUB_SPECTRAL: Spectral axis.</span>
<a name="l00246"></a>00246 <span class="comment">* WCSSUB_STOKES: Stokes axis.</span>
<a name="l00247"></a>00247 <span class="comment">*</span>
<a name="l00248"></a>00248 <span class="comment">* Refer to the notes (below) for further usage examples.</span>
<a name="l00249"></a>00249 <span class="comment">*</span>
<a name="l00250"></a>00250 <span class="comment">* On return, *nsub will contain the number of axes in</span>
<a name="l00251"></a>00251 <span class="comment">* the subimage; this may be zero if there were no axes</span>
<a name="l00252"></a>00252 <span class="comment">* of the required type(s) (in which case no memory will</span>
<a name="l00253"></a>00253 <span class="comment">* be allocated). axes[] will contain the axis numbers</span>
<a name="l00254"></a>00254 <span class="comment">* that were extracted. The vector length must be</span>
<a name="l00255"></a>00255 <span class="comment">* sufficient to contain all axis numbers. No checks are</span>
<a name="l00256"></a>00256 <span class="comment">* performed to verify that the coordinate axes are</span>
<a name="l00257"></a>00257 <span class="comment">* consistent, this is done by wcsset().</span>
<a name="l00258"></a>00258 <span class="comment">*</span>
<a name="l00259"></a>00259 <span class="comment">* wcsdst struct wcsprm*</span>
<a name="l00260"></a>00260 <span class="comment">* Struct describing the subimage. wcsprm::flag should</span>
<a name="l00261"></a>00261 <span class="comment">* be set to -1 if wcsdst was not previously initialized</span>
<a name="l00262"></a>00262 <span class="comment">* (memory leaks may result if it was previously</span>
<a name="l00263"></a>00263 <span class="comment">* initialized).</span>
<a name="l00264"></a>00264 <span class="comment">*</span>
<a name="l00265"></a>00265 <span class="comment">* Function return value:</span>
<a name="l00266"></a>00266 <span class="comment">* int Status return value:</span>
<a name="l00267"></a>00267 <span class="comment">* 0: Success.</span>
<a name="l00268"></a>00268 <span class="comment">* 1: Null wcsprm pointer passed.</span>
<a name="l00269"></a>00269 <span class="comment">* 2: Memory allocation failed.</span>
<a name="l00270"></a>00270 <span class="comment">* 12: Invalid subimage specification.</span>
<a name="l00271"></a>00271 <span class="comment">* 13: Non-separable subimage coordinate system.</span>
<a name="l00272"></a>00272 <span class="comment">*</span>
<a name="l00273"></a>00273 <span class="comment">* For returns > 1, a detailed error message is set in</span>
<a name="l00274"></a>00274 <span class="comment">* wcsprm::err if enabled, see wcserr_enable().</span>
<a name="l00275"></a>00275 <span class="comment">*</span>
<a name="l00276"></a>00276 <span class="comment">* Notes:</span>
<a name="l00277"></a>00277 <span class="comment">* Combinations of subimage axes of particular types may be extracted in the</span>
<a name="l00278"></a>00278 <span class="comment">* same order as they occur in the input image by combining preprocessor</span>
<a name="l00279"></a>00279 <span class="comment">* codes, for example</span>
<a name="l00280"></a>00280 <span class="comment">*</span>
<a name="l00281"></a>00281 <span class="comment">= *nsub = 1;</span>
<a name="l00282"></a>00282 <span class="comment">= axes[0] = WCSSUB_LONGITUDE | WCSSUB_LATITUDE | WCSSUB_SPECTRAL;</span>
<a name="l00283"></a>00283 <span class="comment">*</span>
<a name="l00284"></a>00284 <span class="comment">* would extract the longitude, latitude, and spectral axes in the same order</span>
<a name="l00285"></a>00285 <span class="comment">* as the input image. If one of each were present, *nsub = 3 would be</span>
<a name="l00286"></a>00286 <span class="comment">* returned.</span>
<a name="l00287"></a>00287 <span class="comment">*</span>
<a name="l00288"></a>00288 <span class="comment">* For convenience, WCSSUB_CELESTIAL is defined as the combination</span>
<a name="l00289"></a>00289 <span class="comment">* WCSSUB_LONGITUDE | WCSSUB_LATITUDE | WCSSUB_CUBEFACE.</span>
<a name="l00290"></a>00290 <span class="comment">*</span>
<a name="l00291"></a>00291 <span class="comment">* The codes may also be negated to extract all but the types specified, for</span>
<a name="l00292"></a>00292 <span class="comment">* example</span>
<a name="l00293"></a>00293 <span class="comment">*</span>
<a name="l00294"></a>00294 <span class="comment">= *nsub = 4;</span>
<a name="l00295"></a>00295 <span class="comment">= axes[0] = WCSSUB_LONGITUDE;</span>
<a name="l00296"></a>00296 <span class="comment">= axes[1] = WCSSUB_LATITUDE;</span>
<a name="l00297"></a>00297 <span class="comment">= axes[2] = WCSSUB_CUBEFACE;</span>
<a name="l00298"></a>00298 <span class="comment">= axes[3] = -(WCSSUB_SPECTRAL | WCSSUB_STOKES);</span>
<a name="l00299"></a>00299 <span class="comment">*</span>
<a name="l00300"></a>00300 <span class="comment">* The last of these specifies all axis types other than spectral or Stokes.</span>
<a name="l00301"></a>00301 <span class="comment">* Extraction is done in the order specified by axes[] a longitude axis (if</span>
<a name="l00302"></a>00302 <span class="comment">* present) would be extracted first (via axes[0]) and not subsequently (via</span>
<a name="l00303"></a>00303 <span class="comment">* axes[3]). Likewise for the latitude and cubeface axes in this example.</span>
<a name="l00304"></a>00304 <span class="comment">*</span>
<a name="l00305"></a>00305 <span class="comment">* From the foregoing, it is apparent that the value of *nsub returned may be</span>
<a name="l00306"></a>00306 <span class="comment">* less than or greater than that given. However, it will never exceed the</span>
<a name="l00307"></a>00307 <span class="comment">* number of axes in the input image.</span>
<a name="l00308"></a>00308 <span class="comment">*</span>
<a name="l00309"></a>00309 <span class="comment">*</span>
<a name="l00310"></a>00310 <span class="comment">* wcscopy() macro - Copy routine for the wcsprm struct</span>
<a name="l00311"></a>00311 <span class="comment">* ----------------------------------------------------</span>
<a name="l00312"></a>00312 <span class="comment">* wcscopy() does a deep copy of one wcsprm struct to another. As of</span>
<a name="l00313"></a>00313 <span class="comment">* WCSLIB 3.6, it is implemented as a preprocessor macro that invokes</span>
<a name="l00314"></a>00314 <span class="comment">* wcssub() with the nsub and axes pointers both set to zero.</span>
<a name="l00315"></a>00315 <span class="comment">*</span>
<a name="l00316"></a>00316 <span class="comment">*</span>
<a name="l00317"></a>00317 <span class="comment">* wcsfree() - Destructor for the wcsprm struct</span>
<a name="l00318"></a>00318 <span class="comment">* --------------------------------------------</span>
<a name="l00319"></a>00319 <span class="comment">* wcsfree() frees memory allocated for the wcsprm arrays by wcsini() and/or</span>
<a name="l00320"></a>00320 <span class="comment">* wcsset(). wcsini() records the memory it allocates and wcsfree() will only</span>
<a name="l00321"></a>00321 <span class="comment">* attempt to free this.</span>
<a name="l00322"></a>00322 <span class="comment">*</span>
<a name="l00323"></a>00323 <span class="comment">* PLEASE NOTE: wcsfree() must not be invoked on a wcsprm struct that was not</span>
<a name="l00324"></a>00324 <span class="comment">* initialized by wcsini().</span>
<a name="l00325"></a>00325 <span class="comment">*</span>
<a name="l00326"></a>00326 <span class="comment">* Returned:</span>
<a name="l00327"></a>00327 <span class="comment">* wcs struct wcsprm*</span>
<a name="l00328"></a>00328 <span class="comment">* Coordinate transformation parameters.</span>
<a name="l00329"></a>00329 <span class="comment">*</span>
<a name="l00330"></a>00330 <span class="comment">* Function return value:</span>
<a name="l00331"></a>00331 <span class="comment">* int Status return value:</span>
<a name="l00332"></a>00332 <span class="comment">* 0: Success.</span>
<a name="l00333"></a>00333 <span class="comment">* 1: Null wcsprm pointer passed.</span>
<a name="l00334"></a>00334 <span class="comment">*</span>
<a name="l00335"></a>00335 <span class="comment">*</span>
<a name="l00336"></a>00336 <span class="comment">* wcsprt() - Print routine for the wcsprm struct</span>
<a name="l00337"></a>00337 <span class="comment">* ----------------------------------------------</span>
<a name="l00338"></a>00338 <span class="comment">* wcsprt() prints the contents of a wcsprm struct using wcsprintf(). Mainly</span>
<a name="l00339"></a>00339 <span class="comment">* intended for diagnostic purposes.</span>
<a name="l00340"></a>00340 <span class="comment">*</span>
<a name="l00341"></a>00341 <span class="comment">* Given:</span>
<a name="l00342"></a>00342 <span class="comment">* wcs const struct wcsprm*</span>
<a name="l00343"></a>00343 <span class="comment">* Coordinate transformation parameters.</span>
<a name="l00344"></a>00344 <span class="comment">*</span>
<a name="l00345"></a>00345 <span class="comment">* Function return value:</span>
<a name="l00346"></a>00346 <span class="comment">* int Status return value:</span>
<a name="l00347"></a>00347 <span class="comment">* 0: Success.</span>
<a name="l00348"></a>00348 <span class="comment">* 1: Null wcsprm pointer passed.</span>
<a name="l00349"></a>00349 <span class="comment">*</span>
<a name="l00350"></a>00350 <span class="comment">*</span>
<a name="l00351"></a>00351 <span class="comment">* wcsperr() - Print error messages from a wcsprm struct</span>
<a name="l00352"></a>00352 <span class="comment">* -----------------------------------------------------</span>
<a name="l00353"></a>00353 <span class="comment">* wcsperr() prints the error message(s), if any, stored in a wcsprm struct,</span>
<a name="l00354"></a>00354 <span class="comment">* and the linprm, celprm, prjprm, spcprm, and tabprm structs that it contains.</span>
<a name="l00355"></a>00355 <span class="comment">* If there are no errors then nothing is printed. It uses wcserr_prt(), q.v.</span>
<a name="l00356"></a>00356 <span class="comment">*</span>
<a name="l00357"></a>00357 <span class="comment">* Given:</span>
<a name="l00358"></a>00358 <span class="comment">* wcs const struct wcsprm*</span>
<a name="l00359"></a>00359 <span class="comment">* Coordinate transformation parameters.</span>
<a name="l00360"></a>00360 <span class="comment">*</span>
<a name="l00361"></a>00361 <span class="comment">* prefix const char *</span>
<a name="l00362"></a>00362 <span class="comment">* If non-NULL, each output line will be prefixed with</span>
<a name="l00363"></a>00363 <span class="comment">* this string.</span>
<a name="l00364"></a>00364 <span class="comment">*</span>
<a name="l00365"></a>00365 <span class="comment">* Function return value:</span>
<a name="l00366"></a>00366 <span class="comment">* int Status return value:</span>
<a name="l00367"></a>00367 <span class="comment">* 0: Success.</span>
<a name="l00368"></a>00368 <span class="comment">* 1: Null wcsprm pointer passed.</span>
<a name="l00369"></a>00369 <span class="comment">*</span>
<a name="l00370"></a>00370 <span class="comment">*</span>
<a name="l00371"></a>00371 <span class="comment">* wcsset() - Setup routine for the wcsprm struct</span>
<a name="l00372"></a>00372 <span class="comment">* ----------------------------------------------</span>
<a name="l00373"></a>00373 <span class="comment">* wcsset() sets up a wcsprm struct according to information supplied within</span>
<a name="l00374"></a>00374 <span class="comment">* it (refer to the description of the wcsprm struct).</span>
<a name="l00375"></a>00375 <span class="comment">*</span>
<a name="l00376"></a>00376 <span class="comment">* wcsset() recognizes the NCP projection and converts it to the equivalent SIN</span>
<a name="l00377"></a>00377 <span class="comment">* projection and likewise translates GLS into SFL. It also translates the</span>
<a name="l00378"></a>00378 <span class="comment">* AIPS spectral types ('FREQ-LSR', 'FELO-HEL', etc.), possibly changing the</span>
<a name="l00379"></a>00379 <span class="comment">* input header keywords wcsprm::ctype and/or wcsprm::specsys if necessary.</span>
<a name="l00380"></a>00380 <span class="comment">*</span>
<a name="l00381"></a>00381 <span class="comment">* Note that this routine need not be called directly; it will be invoked by</span>
<a name="l00382"></a>00382 <span class="comment">* wcsp2s() and wcss2p() if the wcsprm::flag is anything other than a</span>
<a name="l00383"></a>00383 <span class="comment">* predefined magic value.</span>
<a name="l00384"></a>00384 <span class="comment">*</span>
<a name="l00385"></a>00385 <span class="comment">* Given and returned:</span>
<a name="l00386"></a>00386 <span class="comment">* wcs struct wcsprm*</span>
<a name="l00387"></a>00387 <span class="comment">* Coordinate transformation parameters.</span>
<a name="l00388"></a>00388 <span class="comment">*</span>
<a name="l00389"></a>00389 <span class="comment">* Function return value:</span>
<a name="l00390"></a>00390 <span class="comment">* int Status return value:</span>
<a name="l00391"></a>00391 <span class="comment">* 0: Success.</span>
<a name="l00392"></a>00392 <span class="comment">* 1: Null wcsprm pointer passed.</span>
<a name="l00393"></a>00393 <span class="comment">* 2: Memory allocation failed.</span>
<a name="l00394"></a>00394 <span class="comment">* 3: Linear transformation matrix is singular.</span>
<a name="l00395"></a>00395 <span class="comment">* 4: Inconsistent or unrecognized coordinate axis</span>
<a name="l00396"></a>00396 <span class="comment">* types.</span>
<a name="l00397"></a>00397 <span class="comment">* 5: Invalid parameter value.</span>
<a name="l00398"></a>00398 <span class="comment">* 6: Invalid coordinate transformation parameters.</span>
<a name="l00399"></a>00399 <span class="comment">* 7: Ill-conditioned coordinate transformation</span>
<a name="l00400"></a>00400 <span class="comment">* parameters.</span>
<a name="l00401"></a>00401 <span class="comment">*</span>
<a name="l00402"></a>00402 <span class="comment">* For returns > 1, a detailed error message is set in</span>
<a name="l00403"></a>00403 <span class="comment">* wcsprm::err if enabled, see wcserr_enable().</span>
<a name="l00404"></a>00404 <span class="comment">*</span>
<a name="l00405"></a>00405 <span class="comment">*</span>
<a name="l00406"></a>00406 <span class="comment">* wcsp2s() - Pixel-to-world transformation</span>
<a name="l00407"></a>00407 <span class="comment">* ----------------------------------------</span>
<a name="l00408"></a>00408 <span class="comment">* wcsp2s() transforms pixel coordinates to world coordinates.</span>
<a name="l00409"></a>00409 <span class="comment">*</span>
<a name="l00410"></a>00410 <span class="comment">* Given and returned:</span>
<a name="l00411"></a>00411 <span class="comment">* wcs struct wcsprm*</span>
<a name="l00412"></a>00412 <span class="comment">* Coordinate transformation parameters.</span>
<a name="l00413"></a>00413 <span class="comment">*</span>
<a name="l00414"></a>00414 <span class="comment">* Given:</span>
<a name="l00415"></a>00415 <span class="comment">* ncoord,</span>
<a name="l00416"></a>00416 <span class="comment">* nelem int The number of coordinates, each of vector length</span>
<a name="l00417"></a>00417 <span class="comment">* nelem but containing wcs.naxis coordinate elements.</span>
<a name="l00418"></a>00418 <span class="comment">* Thus nelem must equal or exceed the value of the</span>
<a name="l00419"></a>00419 <span class="comment">* NAXIS keyword unless ncoord == 1, in which case nelem</span>
<a name="l00420"></a>00420 <span class="comment">* is not used.</span>
<a name="l00421"></a>00421 <span class="comment">*</span>
<a name="l00422"></a>00422 <span class="comment">* pixcrd const double[ncoord][nelem]</span>
<a name="l00423"></a>00423 <span class="comment">* Array of pixel coordinates.</span>
<a name="l00424"></a>00424 <span class="comment">*</span>
<a name="l00425"></a>00425 <span class="comment">* Returned:</span>
<a name="l00426"></a>00426 <span class="comment">* imgcrd double[ncoord][nelem]</span>
<a name="l00427"></a>00427 <span class="comment">* Array of intermediate world coordinates. For</span>
<a name="l00428"></a>00428 <span class="comment">* celestial axes, imgcrd[][wcs.lng] and</span>
<a name="l00429"></a>00429 <span class="comment">* imgcrd[][wcs.lat] are the projected x-, and</span>
<a name="l00430"></a>00430 <span class="comment">* y-coordinates in pseudo "degrees". For spectral</span>
<a name="l00431"></a>00431 <span class="comment">* axes, imgcrd[][wcs.spec] is the intermediate spectral</span>
<a name="l00432"></a>00432 <span class="comment">* coordinate, in SI units.</span>
<a name="l00433"></a>00433 <span class="comment">*</span>
<a name="l00434"></a>00434 <span class="comment">* phi,theta double[ncoord]</span>
<a name="l00435"></a>00435 <span class="comment">* Longitude and latitude in the native coordinate system</span>
<a name="l00436"></a>00436 <span class="comment">* of the projection [deg].</span>
<a name="l00437"></a>00437 <span class="comment">*</span>
<a name="l00438"></a>00438 <span class="comment">* world double[ncoord][nelem]</span>
<a name="l00439"></a>00439 <span class="comment">* Array of world coordinates. For celestial axes,</span>
<a name="l00440"></a>00440 <span class="comment">* world[][wcs.lng] and world[][wcs.lat] are the</span>
<a name="l00441"></a>00441 <span class="comment">* celestial longitude and latitude [deg]. For</span>
<a name="l00442"></a>00442 <span class="comment">* spectral axes, imgcrd[][wcs.spec] is the intermediate</span>
<a name="l00443"></a>00443 <span class="comment">* spectral coordinate, in SI units.</span>
<a name="l00444"></a>00444 <span class="comment">*</span>
<a name="l00445"></a>00445 <span class="comment">* stat int[ncoord]</span>
<a name="l00446"></a>00446 <span class="comment">* Status return value for each coordinate:</span>
<a name="l00447"></a>00447 <span class="comment">* 0: Success.</span>
<a name="l00448"></a>00448 <span class="comment">* 1+: A bit mask indicating invalid pixel coordinate</span>
<a name="l00449"></a>00449 <span class="comment">* element(s).</span>
<a name="l00450"></a>00450 <span class="comment">*</span>
<a name="l00451"></a>00451 <span class="comment">* Function return value:</span>
<a name="l00452"></a>00452 <span class="comment">* int Status return value:</span>
<a name="l00453"></a>00453 <span class="comment">* 0: Success.</span>
<a name="l00454"></a>00454 <span class="comment">* 1: Null wcsprm pointer passed.</span>
<a name="l00455"></a>00455 <span class="comment">* 2: Memory allocation failed.</span>
<a name="l00456"></a>00456 <span class="comment">* 3: Linear transformation matrix is singular.</span>
<a name="l00457"></a>00457 <span class="comment">* 4: Inconsistent or unrecognized coordinate axis</span>
<a name="l00458"></a>00458 <span class="comment">* types.</span>
<a name="l00459"></a>00459 <span class="comment">* 5: Invalid parameter value.</span>
<a name="l00460"></a>00460 <span class="comment">* 6: Invalid coordinate transformation parameters.</span>
<a name="l00461"></a>00461 <span class="comment">* 7: Ill-conditioned coordinate transformation</span>
<a name="l00462"></a>00462 <span class="comment">* parameters.</span>
<a name="l00463"></a>00463 <span class="comment">* 8: One or more of the pixel coordinates were</span>
<a name="l00464"></a>00464 <span class="comment">* invalid, as indicated by the stat vector.</span>
<a name="l00465"></a>00465 <span class="comment">*</span>
<a name="l00466"></a>00466 <span class="comment">* For returns > 1, a detailed error message is set in</span>
<a name="l00467"></a>00467 <span class="comment">* wcsprm::err if enabled, see wcserr_enable().</span>
<a name="l00468"></a>00468 <span class="comment">*</span>
<a name="l00469"></a>00469 <span class="comment">*</span>
<a name="l00470"></a>00470 <span class="comment">* wcss2p() - World-to-pixel transformation</span>
<a name="l00471"></a>00471 <span class="comment">* ----------------------------------------</span>
<a name="l00472"></a>00472 <span class="comment">* wcss2p() transforms world coordinates to pixel coordinates.</span>
<a name="l00473"></a>00473 <span class="comment">*</span>
<a name="l00474"></a>00474 <span class="comment">* Given and returned:</span>
<a name="l00475"></a>00475 <span class="comment">* wcs struct wcsprm*</span>
<a name="l00476"></a>00476 <span class="comment">* Coordinate transformation parameters.</span>
<a name="l00477"></a>00477 <span class="comment">*</span>
<a name="l00478"></a>00478 <span class="comment">* Given:</span>
<a name="l00479"></a>00479 <span class="comment">* ncoord,</span>
<a name="l00480"></a>00480 <span class="comment">* nelem int The number of coordinates, each of vector length nelem</span>
<a name="l00481"></a>00481 <span class="comment">* but containing wcs.naxis coordinate elements. Thus</span>
<a name="l00482"></a>00482 <span class="comment">* nelem must equal or exceed the value of the NAXIS</span>
<a name="l00483"></a>00483 <span class="comment">* keyword unless ncoord == 1, in which case nelem is not</span>
<a name="l00484"></a>00484 <span class="comment">* used.</span>
<a name="l00485"></a>00485 <span class="comment">*</span>
<a name="l00486"></a>00486 <span class="comment">* world const double[ncoord][nelem]</span>
<a name="l00487"></a>00487 <span class="comment">* Array of world coordinates. For celestial axes,</span>
<a name="l00488"></a>00488 <span class="comment">* world[][wcs.lng] and world[][wcs.lat] are the</span>
<a name="l00489"></a>00489 <span class="comment">* celestial longitude and latitude [deg]. For spectral</span>
<a name="l00490"></a>00490 <span class="comment">* axes, world[][wcs.spec] is the spectral coordinate, in</span>
<a name="l00491"></a>00491 <span class="comment">* SI units.</span>
<a name="l00492"></a>00492 <span class="comment">*</span>
<a name="l00493"></a>00493 <span class="comment">* Returned:</span>
<a name="l00494"></a>00494 <span class="comment">* phi,theta double[ncoord]</span>
<a name="l00495"></a>00495 <span class="comment">* Longitude and latitude in the native coordinate</span>
<a name="l00496"></a>00496 <span class="comment">* system of the projection [deg].</span>
<a name="l00497"></a>00497 <span class="comment">*</span>
<a name="l00498"></a>00498 <span class="comment">* imgcrd double[ncoord][nelem]</span>
<a name="l00499"></a>00499 <span class="comment">* Array of intermediate world coordinates. For</span>
<a name="l00500"></a>00500 <span class="comment">* celestial axes, imgcrd[][wcs.lng] and</span>
<a name="l00501"></a>00501 <span class="comment">* imgcrd[][wcs.lat] are the projected x-, and</span>
<a name="l00502"></a>00502 <span class="comment">* y-coordinates in pseudo "degrees". For quadcube</span>
<a name="l00503"></a>00503 <span class="comment">* projections with a CUBEFACE axis the face number is</span>
<a name="l00504"></a>00504 <span class="comment">* also returned in imgcrd[][wcs.cubeface]. For</span>
<a name="l00505"></a>00505 <span class="comment">* spectral axes, imgcrd[][wcs.spec] is the intermediate</span>
<a name="l00506"></a>00506 <span class="comment">* spectral coordinate, in SI units.</span>
<a name="l00507"></a>00507 <span class="comment">*</span>
<a name="l00508"></a>00508 <span class="comment">* pixcrd double[ncoord][nelem]</span>
<a name="l00509"></a>00509 <span class="comment">* Array of pixel coordinates.</span>
<a name="l00510"></a>00510 <span class="comment">*</span>
<a name="l00511"></a>00511 <span class="comment">* stat int[ncoord]</span>
<a name="l00512"></a>00512 <span class="comment">* Status return value for each coordinate:</span>
<a name="l00513"></a>00513 <span class="comment">* 0: Success.</span>
<a name="l00514"></a>00514 <span class="comment">* 1+: A bit mask indicating invalid world coordinate</span>
<a name="l00515"></a>00515 <span class="comment">* element(s).</span>
<a name="l00516"></a>00516 <span class="comment">*</span>
<a name="l00517"></a>00517 <span class="comment">* Function return value:</span>
<a name="l00518"></a>00518 <span class="comment">* int Status return value:</span>
<a name="l00519"></a>00519 <span class="comment">* 0: Success.</span>
<a name="l00520"></a>00520 <span class="comment">* 1: Null wcsprm pointer passed.</span>
<a name="l00521"></a>00521 <span class="comment">* 2: Memory allocation failed.</span>
<a name="l00522"></a>00522 <span class="comment">* 3: Linear transformation matrix is singular.</span>
<a name="l00523"></a>00523 <span class="comment">* 4: Inconsistent or unrecognized coordinate axis</span>
<a name="l00524"></a>00524 <span class="comment">* types.</span>
<a name="l00525"></a>00525 <span class="comment">* 5: Invalid parameter value.</span>
<a name="l00526"></a>00526 <span class="comment">* 6: Invalid coordinate transformation parameters.</span>
<a name="l00527"></a>00527 <span class="comment">* 7: Ill-conditioned coordinate transformation</span>
<a name="l00528"></a>00528 <span class="comment">* parameters.</span>
<a name="l00529"></a>00529 <span class="comment">* 9: One or more of the world coordinates were</span>
<a name="l00530"></a>00530 <span class="comment">* invalid, as indicated by the stat vector.</span>
<a name="l00531"></a>00531 <span class="comment">*</span>
<a name="l00532"></a>00532 <span class="comment">* For returns > 1, a detailed error message is set in</span>
<a name="l00533"></a>00533 <span class="comment">* wcsprm::err if enabled, see wcserr_enable().</span>
<a name="l00534"></a>00534 <span class="comment">*</span>
<a name="l00535"></a>00535 <span class="comment">*</span>
<a name="l00536"></a>00536 <span class="comment">* wcsmix() - Hybrid coordinate transformation</span>
<a name="l00537"></a>00537 <span class="comment">* -------------------------------------------</span>
<a name="l00538"></a>00538 <span class="comment">* wcsmix(), given either the celestial longitude or latitude plus an element</span>
<a name="l00539"></a>00539 <span class="comment">* of the pixel coordinate, solves for the remaining elements by iterating on</span>
<a name="l00540"></a>00540 <span class="comment">* the unknown celestial coordinate element using wcss2p(). Refer also to the</span>
<a name="l00541"></a>00541 <span class="comment">* notes below.</span>
<a name="l00542"></a>00542 <span class="comment">*</span>
<a name="l00543"></a>00543 <span class="comment">* Given and returned:</span>
<a name="l00544"></a>00544 <span class="comment">* wcs struct wcsprm*</span>
<a name="l00545"></a>00545 <span class="comment">* Indices for the celestial coordinates obtained</span>
<a name="l00546"></a>00546 <span class="comment">* by parsing the wcsprm::ctype[].</span>
<a name="l00547"></a>00547 <span class="comment">*</span>
<a name="l00548"></a>00548 <span class="comment">* Given:</span>
<a name="l00549"></a>00549 <span class="comment">* mixpix int Which element of the pixel coordinate is given.</span>
<a name="l00550"></a>00550 <span class="comment">*</span>
<a name="l00551"></a>00551 <span class="comment">* mixcel int Which element of the celestial coordinate is given:</span>
<a name="l00552"></a>00552 <span class="comment">* 1: Celestial longitude is given in</span>
<a name="l00553"></a>00553 <span class="comment">* world[wcs.lng], latitude returned in</span>
<a name="l00554"></a>00554 <span class="comment">* world[wcs.lat].</span>
<a name="l00555"></a>00555 <span class="comment">* 2: Celestial latitude is given in</span>
<a name="l00556"></a>00556 <span class="comment">* world[wcs.lat], longitude returned in</span>
<a name="l00557"></a>00557 <span class="comment">* world[wcs.lng].</span>
<a name="l00558"></a>00558 <span class="comment">*</span>
<a name="l00559"></a>00559 <span class="comment">* vspan const double[2]</span>
<a name="l00560"></a>00560 <span class="comment">* Solution interval for the celestial coordinate [deg].</span>
<a name="l00561"></a>00561 <span class="comment">* The ordering of the two limits is irrelevant.</span>
<a name="l00562"></a>00562 <span class="comment">* Longitude ranges may be specified with any convenient</span>
<a name="l00563"></a>00563 <span class="comment">* normalization, for example [-120,+120] is the same as</span>
<a name="l00564"></a>00564 <span class="comment">* [240,480], except that the solution will be returned</span>
<a name="l00565"></a>00565 <span class="comment">* with the same normalization, i.e. lie within the</span>
<a name="l00566"></a>00566 <span class="comment">* interval specified.</span>
<a name="l00567"></a>00567 <span class="comment">*</span>
<a name="l00568"></a>00568 <span class="comment">* vstep const double</span>
<a name="l00569"></a>00569 <span class="comment">* Step size for solution search [deg]. If zero, a</span>
<a name="l00570"></a>00570 <span class="comment">* sensible, although perhaps non-optimal default will be</span>
<a name="l00571"></a>00571 <span class="comment">* used.</span>
<a name="l00572"></a>00572 <span class="comment">*</span>
<a name="l00573"></a>00573 <span class="comment">* viter int If a solution is not found then the step size will be</span>
<a name="l00574"></a>00574 <span class="comment">* halved and the search recommenced. viter controls how</span>
<a name="l00575"></a>00575 <span class="comment">* many times the step size is halved. The allowed range</span>
<a name="l00576"></a>00576 <span class="comment">* is 5 - 10.</span>
<a name="l00577"></a>00577 <span class="comment">*</span>
<a name="l00578"></a>00578 <span class="comment">* Given and returned:</span>
<a name="l00579"></a>00579 <span class="comment">* world double[naxis]</span>
<a name="l00580"></a>00580 <span class="comment">* World coordinate elements. world[wcs.lng] and</span>
<a name="l00581"></a>00581 <span class="comment">* world[wcs.lat] are the celestial longitude and</span>
<a name="l00582"></a>00582 <span class="comment">* latitude [deg]. Which is given and which returned</span>
<a name="l00583"></a>00583 <span class="comment">* depends on the value of mixcel. All other elements</span>
<a name="l00584"></a>00584 <span class="comment">* are given.</span>
<a name="l00585"></a>00585 <span class="comment">*</span>
<a name="l00586"></a>00586 <span class="comment">* Returned:</span>
<a name="l00587"></a>00587 <span class="comment">* phi,theta double[naxis]</span>
<a name="l00588"></a>00588 <span class="comment">* Longitude and latitude in the native coordinate</span>
<a name="l00589"></a>00589 <span class="comment">* system of the projection [deg].</span>
<a name="l00590"></a>00590 <span class="comment">*</span>
<a name="l00591"></a>00591 <span class="comment">* imgcrd double[naxis]</span>
<a name="l00592"></a>00592 <span class="comment">* Image coordinate elements. imgcrd[wcs.lng] and</span>
<a name="l00593"></a>00593 <span class="comment">* imgcrd[wcs.lat] are the projected x-, and</span>
<a name="l00594"></a>00594 <span class="comment">* y-coordinates in pseudo "degrees".</span>
<a name="l00595"></a>00595 <span class="comment">*</span>
<a name="l00596"></a>00596 <span class="comment">* Given and returned:</span>
<a name="l00597"></a>00597 <span class="comment">* pixcrd double[naxis]</span>
<a name="l00598"></a>00598 <span class="comment">* Pixel coordinate. The element indicated by mixpix is</span>
<a name="l00599"></a>00599 <span class="comment">* given and the remaining elements are returned.</span>
<a name="l00600"></a>00600 <span class="comment">*</span>
<a name="l00601"></a>00601 <span class="comment">* Function return value:</span>
<a name="l00602"></a>00602 <span class="comment">* int Status return value:</span>
<a name="l00603"></a>00603 <span class="comment">* 0: Success.</span>
<a name="l00604"></a>00604 <span class="comment">* 1: Null wcsprm pointer passed.</span>
<a name="l00605"></a>00605 <span class="comment">* 2: Memory allocation failed.</span>
<a name="l00606"></a>00606 <span class="comment">* 3: Linear transformation matrix is singular.</span>
<a name="l00607"></a>00607 <span class="comment">* 4: Inconsistent or unrecognized coordinate axis</span>
<a name="l00608"></a>00608 <span class="comment">* types.</span>
<a name="l00609"></a>00609 <span class="comment">* 5: Invalid parameter value.</span>
<a name="l00610"></a>00610 <span class="comment">* 6: Invalid coordinate transformation parameters.</span>
<a name="l00611"></a>00611 <span class="comment">* 7: Ill-conditioned coordinate transformation</span>
<a name="l00612"></a>00612 <span class="comment">* parameters.</span>
<a name="l00613"></a>00613 <span class="comment">* 10: Invalid world coordinate.</span>
<a name="l00614"></a>00614 <span class="comment">* 11: No solution found in the specified interval.</span>
<a name="l00615"></a>00615 <span class="comment">*</span>
<a name="l00616"></a>00616 <span class="comment">* For returns > 1, a detailed error message is set in</span>
<a name="l00617"></a>00617 <span class="comment">* wcsprm::err if enabled, see wcserr_enable().</span>
<a name="l00618"></a>00618 <span class="comment">*</span>
<a name="l00619"></a>00619 <span class="comment">* Notes:</span>
<a name="l00620"></a>00620 <span class="comment">* Initially the specified solution interval is checked to see if it's a</span>
<a name="l00621"></a>00621 <span class="comment">* "crossing" interval. If it isn't, a search is made for a crossing</span>
<a name="l00622"></a>00622 <span class="comment">* solution by iterating on the unknown celestial coordinate starting at the</span>
<a name="l00623"></a>00623 <span class="comment">* upper limit of the solution interval and decrementing by the specified</span>
<a name="l00624"></a>00624 <span class="comment">* step size. A crossing is indicated if the trial value of the pixel</span>
<a name="l00625"></a>00625 <span class="comment">* coordinate steps through the value specified. If a crossing interval is</span>
<a name="l00626"></a>00626 <span class="comment">* found then the solution is determined by a modified form of "regula falsi"</span>
<a name="l00627"></a>00627 <span class="comment">* division of the crossing interval. If no crossing interval was found</span>
<a name="l00628"></a>00628 <span class="comment">* within the specified solution interval then a search is made for a</span>
<a name="l00629"></a>00629 <span class="comment">* "non-crossing" solution as may arise from a point of tangency. The</span>
<a name="l00630"></a>00630 <span class="comment">* process is complicated by having to make allowance for the discontinuities</span>
<a name="l00631"></a>00631 <span class="comment">* that occur in all map projections.</span>
<a name="l00632"></a>00632 <span class="comment">*</span>
<a name="l00633"></a>00633 <span class="comment">* Once one solution has been determined others may be found by subsequent</span>
<a name="l00634"></a>00634 <span class="comment">* invokations of wcsmix() with suitably restricted solution intervals.</span>
<a name="l00635"></a>00635 <span class="comment">*</span>
<a name="l00636"></a>00636 <span class="comment">* Note the circumstance that arises when the solution point lies at a native</span>
<a name="l00637"></a>00637 <span class="comment">* pole of a projection in which the pole is represented as a finite curve,</span>
<a name="l00638"></a>00638 <span class="comment">* for example the zenithals and conics. In such cases two or more valid</span>
<a name="l00639"></a>00639 <span class="comment">* solutions may exist but wcsmix() only ever returns one.</span>
<a name="l00640"></a>00640 <span class="comment">*</span>
<a name="l00641"></a>00641 <span class="comment">* Because of its generality wcsmix() is very compute-intensive. For</span>
<a name="l00642"></a>00642 <span class="comment">* compute-limited applications more efficient special-case solvers could be</span>
<a name="l00643"></a>00643 <span class="comment">* written for simple projections, for example non-oblique cylindrical</span>
<a name="l00644"></a>00644 <span class="comment">* projections.</span>
<a name="l00645"></a>00645 <span class="comment">*</span>
<a name="l00646"></a>00646 <span class="comment">*</span>
<a name="l00647"></a>00647 <span class="comment">* wcssptr() - Spectral axis translation</span>
<a name="l00648"></a>00648 <span class="comment">* -------------------------------------</span>
<a name="l00649"></a>00649 <span class="comment">* wcssptr() translates the spectral axis in a wcsprm struct. For example, a</span>
<a name="l00650"></a>00650 <span class="comment">* 'FREQ' axis may be translated into 'ZOPT-F2W' and vice versa.</span>
<a name="l00651"></a>00651 <span class="comment">*</span>
<a name="l00652"></a>00652 <span class="comment">* Given and returned:</span>
<a name="l00653"></a>00653 <span class="comment">* wcs struct wcsprm*</span>
<a name="l00654"></a>00654 <span class="comment">* Coordinate transformation parameters.</span>
<a name="l00655"></a>00655 <span class="comment">*</span>
<a name="l00656"></a>00656 <span class="comment">* i int* Index of the spectral axis (0-relative). If given < 0</span>
<a name="l00657"></a>00657 <span class="comment">* it will be set to the first spectral axis identified</span>
<a name="l00658"></a>00658 <span class="comment">* from the ctype[] keyvalues in the wcsprm struct.</span>
<a name="l00659"></a>00659 <span class="comment">*</span>
<a name="l00660"></a>00660 <span class="comment">* ctype char[9] Desired spectral CTYPEia. Wildcarding may be used as</span>
<a name="l00661"></a>00661 <span class="comment">* for the ctypeS2 argument to spctrn() as described in</span>
<a name="l00662"></a>00662 <span class="comment">* the prologue of spc.h, i.e. if the final three</span>
<a name="l00663"></a>00663 <span class="comment">* characters are specified as "???", or if just the</span>
<a name="l00664"></a>00664 <span class="comment">* eighth character is specified as '?', the correct</span>
<a name="l00665"></a>00665 <span class="comment">* algorithm code will be substituted and returned.</span>
<a name="l00666"></a>00666 <span class="comment">*</span>
<a name="l00667"></a>00667 <span class="comment">* Function return value:</span>
<a name="l00668"></a>00668 <span class="comment">* int Status return value:</span>
<a name="l00669"></a>00669 <span class="comment">* 0: Success.</span>
<a name="l00670"></a>00670 <span class="comment">* 1: Null wcsprm pointer passed.</span>
<a name="l00671"></a>00671 <span class="comment">* 2: Memory allocation failed.</span>
<a name="l00672"></a>00672 <span class="comment">* 3: Linear transformation matrix is singular.</span>
<a name="l00673"></a>00673 <span class="comment">* 4: Inconsistent or unrecognized coordinate axis</span>
<a name="l00674"></a>00674 <span class="comment">* types.</span>
<a name="l00675"></a>00675 <span class="comment">* 5: Invalid parameter value.</span>
<a name="l00676"></a>00676 <span class="comment">* 6: Invalid coordinate transformation parameters.</span>
<a name="l00677"></a>00677 <span class="comment">* 7: Ill-conditioned coordinate transformation</span>
<a name="l00678"></a>00678 <span class="comment">* parameters.</span>
<a name="l00679"></a>00679 <span class="comment">* 12: Invalid subimage specification (no spectral</span>
<a name="l00680"></a>00680 <span class="comment">* axis).</span>
<a name="l00681"></a>00681 <span class="comment">*</span>
<a name="l00682"></a>00682 <span class="comment">* For returns > 1, a detailed error message is set in</span>
<a name="l00683"></a>00683 <span class="comment">* wcsprm::err if enabled, see wcserr_enable().</span>
<a name="l00684"></a>00684 <span class="comment">*</span>
<a name="l00685"></a>00685 <span class="comment">*</span>
<a name="l00686"></a>00686 <span class="comment">* wcsprm struct - Coordinate transformation parameters</span>
<a name="l00687"></a>00687 <span class="comment">* ----------------------------------------------------</span>
<a name="l00688"></a>00688 <span class="comment">* The wcsprm struct contains information required to transform world</span>
<a name="l00689"></a>00689 <span class="comment">* coordinates. It consists of certain members that must be set by the user</span>
<a name="l00690"></a>00690 <span class="comment">* ("given") and others that are set by the WCSLIB routines ("returned").</span>
<a name="l00691"></a>00691 <span class="comment">* Some of the former are not actually required for transforming coordinates.</span>
<a name="l00692"></a>00692 <span class="comment">* These are described as "auxiliary"; the struct simply provides a place to</span>
<a name="l00693"></a>00693 <span class="comment">* store them, though they may be used by wcshdo() in constructing a FITS</span>
<a name="l00694"></a>00694 <span class="comment">* header from a wcsprm struct. Some of the returned values are supplied for</span>
<a name="l00695"></a>00695 <span class="comment">* informational purposes and others are for internal use only as indicated.</span>
<a name="l00696"></a>00696 <span class="comment">*</span>
<a name="l00697"></a>00697 <span class="comment">* In practice, it is expected that a WCS parser would scan the FITS header to</span>
<a name="l00698"></a>00698 <span class="comment">* determine the number of coordinate axes. It would then use wcsini() to</span>
<a name="l00699"></a>00699 <span class="comment">* allocate memory for arrays in the wcsprm struct and set default values.</span>
<a name="l00700"></a>00700 <span class="comment">* Then as it reread the header and identified each WCS keyrecord it would load</span>
<a name="l00701"></a>00701 <span class="comment">* the value into the relevant wcsprm array element. This is essentially what</span>
<a name="l00702"></a>00702 <span class="comment">* wcspih() does - refer to the prologue of wcshdr.h. As the final step,</span>
<a name="l00703"></a>00703 <span class="comment">* wcsset() is invoked, either directly or indirectly, to set the derived</span>
<a name="l00704"></a>00704 <span class="comment">* members of the wcsprm struct. wcsset() strips off trailing blanks in all</span>
<a name="l00705"></a>00705 <span class="comment">* string members and null-fills the character array.</span>
<a name="l00706"></a>00706 <span class="comment">*</span>
<a name="l00707"></a>00707 <span class="comment">* int flag</span>
<a name="l00708"></a>00708 <span class="comment">* (Given and returned) This flag must be set to zero whenever any of the</span>
<a name="l00709"></a>00709 <span class="comment">* following wcsprm struct members are set or changed:</span>
<a name="l00710"></a>00710 <span class="comment">*</span>
<a name="l00711"></a>00711 <span class="comment">* - wcsprm::naxis (q.v., not normally set by the user),</span>
<a name="l00712"></a>00712 <span class="comment">* - wcsprm::crpix,</span>
<a name="l00713"></a>00713 <span class="comment">* - wcsprm::pc,</span>
<a name="l00714"></a>00714 <span class="comment">* - wcsprm::cdelt,</span>
<a name="l00715"></a>00715 <span class="comment">* - wcsprm::crval,</span>
<a name="l00716"></a>00716 <span class="comment">* - wcsprm::cunit,</span>
<a name="l00717"></a>00717 <span class="comment">* - wcsprm::ctype,</span>
<a name="l00718"></a>00718 <span class="comment">* - wcsprm::lonpole,</span>
<a name="l00719"></a>00719 <span class="comment">* - wcsprm::latpole,</span>
<a name="l00720"></a>00720 <span class="comment">* - wcsprm::restfrq,</span>
<a name="l00721"></a>00721 <span class="comment">* - wcsprm::restwav,</span>
<a name="l00722"></a>00722 <span class="comment">* - wcsprm::npv,</span>
<a name="l00723"></a>00723 <span class="comment">* - wcsprm::pv,</span>
<a name="l00724"></a>00724 <span class="comment">* - wcsprm::nps,</span>
<a name="l00725"></a>00725 <span class="comment">* - wcsprm::ps,</span>
<a name="l00726"></a>00726 <span class="comment">* - wcsprm::cd,</span>
<a name="l00727"></a>00727 <span class="comment">* - wcsprm::crota,</span>
<a name="l00728"></a>00728 <span class="comment">* - wcsprm::altlin.</span>
<a name="l00729"></a>00729 <span class="comment">*</span>
<a name="l00730"></a>00730 <span class="comment">* This signals the initialization routine, wcsset(), to recompute the</span>
<a name="l00731"></a>00731 <span class="comment">* returned members of the celprm struct. celset() will reset flag to</span>
<a name="l00732"></a>00732 <span class="comment">* indicate that this has been done.</span>
<a name="l00733"></a>00733 <span class="comment">*</span>
<a name="l00734"></a>00734 <span class="comment">* PLEASE NOTE: flag should be set to -1 when wcsini() is called for the</span>
<a name="l00735"></a>00735 <span class="comment">* first time for a particular wcsprm struct in order to initialize memory</span>
<a name="l00736"></a>00736 <span class="comment">* management. It must ONLY be used on the first initialization otherwise</span>
<a name="l00737"></a>00737 <span class="comment">* memory leaks may result.</span>
<a name="l00738"></a>00738 <span class="comment">*</span>
<a name="l00739"></a>00739 <span class="comment">* int naxis</span>
<a name="l00740"></a>00740 <span class="comment">* (Given or returned) Number of pixel and world coordinate elements.</span>
<a name="l00741"></a>00741 <span class="comment">*</span>
<a name="l00742"></a>00742 <span class="comment">* If wcsini() is used to initialize the linprm struct (as would normally</span>
<a name="l00743"></a>00743 <span class="comment">* be the case) then it will set naxis from the value passed to it as a</span>
<a name="l00744"></a>00744 <span class="comment">* function argument. The user should not subsequently modify it.</span>
<a name="l00745"></a>00745 <span class="comment">*</span>
<a name="l00746"></a>00746 <span class="comment">* double *crpix</span>
<a name="l00747"></a>00747 <span class="comment">* (Given) Address of the first element of an array of double containing</span>
<a name="l00748"></a>00748 <span class="comment">* the coordinate reference pixel, CRPIXja.</span>
<a name="l00749"></a>00749 <span class="comment">*</span>
<a name="l00750"></a>00750 <span class="comment">* double *pc</span>
<a name="l00751"></a>00751 <span class="comment">* (Given) Address of the first element of the PCi_ja (pixel coordinate)</span>
<a name="l00752"></a>00752 <span class="comment">* transformation matrix. The expected order is</span>
<a name="l00753"></a>00753 <span class="comment">*</span>
<a name="l00754"></a>00754 <span class="comment">= struct wcsprm wcs;</span>
<a name="l00755"></a>00755 <span class="comment">= wcs.pc = {PC1_1, PC1_2, PC2_1, PC2_2};</span>
<a name="l00756"></a>00756 <span class="comment">*</span>
<a name="l00757"></a>00757 <span class="comment">* This may be constructed conveniently from a 2-D array via</span>
<a name="l00758"></a>00758 <span class="comment">*</span>
<a name="l00759"></a>00759 <span class="comment">= double m[2][2] = {{PC1_1, PC1_2},</span>
<a name="l00760"></a>00760 <span class="comment">= {PC2_1, PC2_2}};</span>
<a name="l00761"></a>00761 <span class="comment">*</span>
<a name="l00762"></a>00762 <span class="comment">* which is equivalent to</span>
<a name="l00763"></a>00763 <span class="comment">*</span>
<a name="l00764"></a>00764 <span class="comment">= double m[2][2];</span>
<a name="l00765"></a>00765 <span class="comment">= m[0][0] = PC1_1;</span>
<a name="l00766"></a>00766 <span class="comment">= m[0][1] = PC1_2;</span>
<a name="l00767"></a>00767 <span class="comment">= m[1][0] = PC2_1;</span>
<a name="l00768"></a>00768 <span class="comment">= m[1][1] = PC2_2;</span>
<a name="l00769"></a>00769 <span class="comment">*</span>
<a name="l00770"></a>00770 <span class="comment">* The storage order for this 2-D array is the same as for the 1-D array,</span>
<a name="l00771"></a>00771 <span class="comment">* whence</span>
<a name="l00772"></a>00772 <span class="comment">*</span>
<a name="l00773"></a>00773 <span class="comment">= wcs.pc = *m;</span>
<a name="l00774"></a>00774 <span class="comment">*</span>
<a name="l00775"></a>00775 <span class="comment">* would be legitimate.</span>
<a name="l00776"></a>00776 <span class="comment">*</span>
<a name="l00777"></a>00777 <span class="comment">* double *cdelt</span>
<a name="l00778"></a>00778 <span class="comment">* (Given) Address of the first element of an array of double containing</span>
<a name="l00779"></a>00779 <span class="comment">* the coordinate increments, CDELTia.</span>
<a name="l00780"></a>00780 <span class="comment">*</span>
<a name="l00781"></a>00781 <span class="comment">* double *crval</span>
<a name="l00782"></a>00782 <span class="comment">* (Given) Address of the first element of an array of double containing</span>
<a name="l00783"></a>00783 <span class="comment">* the coordinate reference values, CRVALia.</span>
<a name="l00784"></a>00784 <span class="comment">*</span>
<a name="l00785"></a>00785 <span class="comment">* char (*cunit)[72]</span>
<a name="l00786"></a>00786 <span class="comment">* (Given) Address of the first element of an array of char[72] containing</span>
<a name="l00787"></a>00787 <span class="comment">* the CUNITia keyvalues which define the units of measurement of the</span>
<a name="l00788"></a>00788 <span class="comment">* CRVALia, CDELTia, and CDi_ja keywords.</span>
<a name="l00789"></a>00789 <span class="comment">*</span>
<a name="l00790"></a>00790 <span class="comment">* As CUNITia is an optional header keyword, cunit[][72] may be left blank</span>
<a name="l00791"></a>00791 <span class="comment">* but otherwise is expected to contain a standard units specification as</span>
<a name="l00792"></a>00792 <span class="comment">* defined by WCS Paper I. Utility function wcsutrn(), described in</span>
<a name="l00793"></a>00793 <span class="comment">* wcsunits.h, is available to translate commonly used non-standard units</span>
<a name="l00794"></a>00794 <span class="comment">* specifications but this must be done as a separate step before invoking</span>
<a name="l00795"></a>00795 <span class="comment">* wcsset().</span>
<a name="l00796"></a>00796 <span class="comment">*</span>
<a name="l00797"></a>00797 <span class="comment">* For celestial axes, if cunit[][72] is not blank, wcsset() uses</span>
<a name="l00798"></a>00798 <span class="comment">* wcsunits() to parse it and scale cdelt[], crval[], and cd[][*] to</span>
<a name="l00799"></a>00799 <span class="comment">* degrees. It then resets cunit[][72] to "deg".</span>
<a name="l00800"></a>00800 <span class="comment">*</span>
<a name="l00801"></a>00801 <span class="comment">* For spectral axes, if cunit[][72] is not blank, wcsset() uses wcsunits()</span>
<a name="l00802"></a>00802 <span class="comment">* to parse it and scale cdelt[], crval[], and cd[][*] to SI units. It</span>
<a name="l00803"></a>00803 <span class="comment">* then resets cunit[][72] accordingly.</span>
<a name="l00804"></a>00804 <span class="comment">*</span>
<a name="l00805"></a>00805 <span class="comment">* wcsset() ignores cunit[][72] for other coordinate types; cunit[][72] may</span>
<a name="l00806"></a>00806 <span class="comment">* be used to label coordinate values.</span>
<a name="l00807"></a>00807 <span class="comment">*</span>
<a name="l00808"></a>00808 <span class="comment">* These variables accomodate the longest allowed string-valued FITS</span>
<a name="l00809"></a>00809 <span class="comment">* keyword, being limited to 68 characters, plus the null-terminating</span>
<a name="l00810"></a>00810 <span class="comment">* character.</span>
<a name="l00811"></a>00811 <span class="comment">*</span>
<a name="l00812"></a>00812 <span class="comment">* char (*ctype)[72]</span>
<a name="l00813"></a>00813 <span class="comment">* (Given) Address of the first element of an array of char[72] containing</span>
<a name="l00814"></a>00814 <span class="comment">* the coordinate axis types, CTYPEia.</span>
<a name="l00815"></a>00815 <span class="comment">*</span>
<a name="l00816"></a>00816 <span class="comment">* The ctype[][72] keyword values must be in upper case and there must be</span>
<a name="l00817"></a>00817 <span class="comment">* zero or one pair of matched celestial axis types, and zero or one</span>
<a name="l00818"></a>00818 <span class="comment">* spectral axis. The ctype[][72] strings should be padded with blanks on</span>
<a name="l00819"></a>00819 <span class="comment">* the right and null-terminated so that they are at least eight characters</span>
<a name="l00820"></a>00820 <span class="comment">* in length.</span>
<a name="l00821"></a>00821 <span class="comment">*</span>
<a name="l00822"></a>00822 <span class="comment">* These variables accomodate the longest allowed string-valued FITS</span>
<a name="l00823"></a>00823 <span class="comment">* keyword, being limited to 68 characters, plus the null-terminating</span>
<a name="l00824"></a>00824 <span class="comment">* character.</span>
<a name="l00825"></a>00825 <span class="comment">*</span>
<a name="l00826"></a>00826 <span class="comment">* double lonpole</span>
<a name="l00827"></a>00827 <span class="comment">* (Given and returned) The native longitude of the celestial pole, phi_p,</span>
<a name="l00828"></a>00828 <span class="comment">* given by LONPOLEa [deg] or by PVi_2a [deg] attached to the longitude</span>
<a name="l00829"></a>00829 <span class="comment">* axis which takes precedence if defined, and ...</span>
<a name="l00830"></a>00830 <span class="comment">* double latpole</span>
<a name="l00831"></a>00831 <span class="comment">* (Given and returned) ... the native latitude of the celestial pole,</span>
<a name="l00832"></a>00832 <span class="comment">* theta_p, given by LATPOLEa [deg] or by PVi_3a [deg] attached to the</span>
<a name="l00833"></a>00833 <span class="comment">* longitude axis which takes precedence if defined.</span>
<a name="l00834"></a>00834 <span class="comment">*</span>
<a name="l00835"></a>00835 <span class="comment">* lonpole and latpole may be left to default to values set by wcsini()</span>
<a name="l00836"></a>00836 <span class="comment">* (see celprm::ref), but in any case they will be reset by wcsset() to</span>
<a name="l00837"></a>00837 <span class="comment">* the values actually used. Note therefore that if the wcsprm struct is</span>
<a name="l00838"></a>00838 <span class="comment">* reused without resetting them, whether directly or via wcsini(), they</span>
<a name="l00839"></a>00839 <span class="comment">* will no longer have their default values.</span>
<a name="l00840"></a>00840 <span class="comment">*</span>
<a name="l00841"></a>00841 <span class="comment">* double restfrq</span>
<a name="l00842"></a>00842 <span class="comment">* (Given) The rest frequency [Hz], and/or ...</span>
<a name="l00843"></a>00843 <span class="comment">* double restwav</span>
<a name="l00844"></a>00844 <span class="comment">* (Given) ... the rest wavelength in vacuuo [m], only one of which need be</span>
<a name="l00845"></a>00845 <span class="comment">* given, the other should be set to zero.</span>
<a name="l00846"></a>00846 <span class="comment">*</span>
<a name="l00847"></a>00847 <span class="comment">* int npv</span>
<a name="l00848"></a>00848 <span class="comment">* (Given) The number of entries in the wcsprm::pv[] array.</span>
<a name="l00849"></a>00849 <span class="comment">*</span>
<a name="l00850"></a>00850 <span class="comment">* int npvmax</span>
<a name="l00851"></a>00851 <span class="comment">* (Given or returned) The length of the wcsprm::pv[] array.</span>
<a name="l00852"></a>00852 <span class="comment">*</span>
<a name="l00853"></a>00853 <span class="comment">* npvmax will be set by wcsini() if it allocates memory for wcsprm::pv[],</span>
<a name="l00854"></a>00854 <span class="comment">* otherwise it must be set by the user. See also wcsnpv().</span>
<a name="l00855"></a>00855 <span class="comment">*</span>
<a name="l00856"></a>00856 <span class="comment">* struct pvcard *pv</span>
<a name="l00857"></a>00857 <span class="comment">* (Given or returned) Address of the first element of an array of length</span>
<a name="l00858"></a>00858 <span class="comment">* npvmax of pvcard structs. Set by wcsini() if it allocates memory for</span>
<a name="l00859"></a>00859 <span class="comment">* pv[], otherwise it must be set by the user. See also wcsnpv().</span>
<a name="l00860"></a>00860 <span class="comment">*</span>
<a name="l00861"></a>00861 <span class="comment">* As a FITS header parser encounters each PVi_ma keyword it should load it</span>
<a name="l00862"></a>00862 <span class="comment">* into a pvcard struct in the array and increment npv. wcsset()</span>
<a name="l00863"></a>00863 <span class="comment">* interprets these as required.</span>
<a name="l00864"></a>00864 <span class="comment">*</span>
<a name="l00865"></a>00865 <span class="comment">* Note that, if they were not given, wcsset() resets the entries for</span>
<a name="l00866"></a>00866 <span class="comment">* PVi_1a, PVi_2a, PVi_3a, and PVi_4a for longitude axis i to match</span>
<a name="l00867"></a>00867 <span class="comment">* phi_0 and theta_0 (the native longitude and latitude of the reference</span>
<a name="l00868"></a>00868 <span class="comment">* point), LONPOLEa and LATPOLEa respectively.</span>
<a name="l00869"></a>00869 <span class="comment">*</span>
<a name="l00870"></a>00870 <span class="comment">* int nps</span>
<a name="l00871"></a>00871 <span class="comment">* (Given) The number of entries in the wcsprm::ps[] array.</span>
<a name="l00872"></a>00872 <span class="comment">*</span>
<a name="l00873"></a>00873 <span class="comment">* int npsmax</span>
<a name="l00874"></a>00874 <span class="comment">* (Given or returned) The length of the wcsprm::ps[] array.</span>
<a name="l00875"></a>00875 <span class="comment">*</span>
<a name="l00876"></a>00876 <span class="comment">* npsmax will be set by wcsini() if it allocates memory for wcsprm::ps[],</span>
<a name="l00877"></a>00877 <span class="comment">* otherwise it must be set by the user. See also wcsnps().</span>
<a name="l00878"></a>00878 <span class="comment">*</span>
<a name="l00879"></a>00879 <span class="comment">* struct pscard *ps</span>
<a name="l00880"></a>00880 <span class="comment">* (Given or returned) Address of the first element of an array of length</span>
<a name="l00881"></a>00881 <span class="comment">* npsmax of pscard structs. Set by wcsini() if it allocates memory for</span>
<a name="l00882"></a>00882 <span class="comment">* ps[], otherwise it must be set by the user. See also wcsnps().</span>
<a name="l00883"></a>00883 <span class="comment">*</span>
<a name="l00884"></a>00884 <span class="comment">* As a FITS header parser encounters each PSi_ma keyword it should load it</span>
<a name="l00885"></a>00885 <span class="comment">* into a pscard struct in the array and increment nps. wcsset()</span>
<a name="l00886"></a>00886 <span class="comment">* interprets these as required (currently no PSi_ma keyvalues are</span>
<a name="l00887"></a>00887 <span class="comment">* recognized).</span>
<a name="l00888"></a>00888 <span class="comment">*</span>
<a name="l00889"></a>00889 <span class="comment">* double *cd</span>
<a name="l00890"></a>00890 <span class="comment">* (Given) For historical compatibility, the wcsprm struct supports two</span>
<a name="l00891"></a>00891 <span class="comment">* alternate specifications of the linear transformation matrix, those</span>
<a name="l00892"></a>00892 <span class="comment">* associated with the CDi_ja keywords, and ...</span>
<a name="l00893"></a>00893 <span class="comment">* double *crota</span>
<a name="l00894"></a>00894 <span class="comment">* (Given) ... those associated with the CROTAia keywords. Although these</span>
<a name="l00895"></a>00895 <span class="comment">* may not formally co-exist with PCi_ja, the approach taken here is simply</span>
<a name="l00896"></a>00896 <span class="comment">* to ignore them if given in conjunction with PCi_ja.</span>
<a name="l00897"></a>00897 <span class="comment">*</span>
<a name="l00898"></a>00898 <span class="comment">* int altlin</span>
<a name="l00899"></a>00899 <span class="comment">* (Given) altlin is a bit flag that denotes which of the PCi_ja, CDi_ja</span>
<a name="l00900"></a>00900 <span class="comment">* and CROTAia keywords are present in the header:</span>
<a name="l00901"></a>00901 <span class="comment">*</span>
<a name="l00902"></a>00902 <span class="comment">* - Bit 0: PCi_ja is present.</span>
<a name="l00903"></a>00903 <span class="comment">*</span>
<a name="l00904"></a>00904 <span class="comment">* - Bit 1: CDi_ja is present.</span>
<a name="l00905"></a>00905 <span class="comment">*</span>
<a name="l00906"></a>00906 <span class="comment">* Matrix elements in the IRAF convention are</span>
<a name="l00907"></a>00907 <span class="comment">* equivalent to the product CDi_ja = CDELTia * PCi_ja, but the</span>
<a name="l00908"></a>00908 <span class="comment">* defaults differ from that of the PCi_ja matrix. If one or more</span>
<a name="l00909"></a>00909 <span class="comment">* CDi_ja keywords are present then all unspecified CDi_ja default to</span>
<a name="l00910"></a>00910 <span class="comment">* zero. If no CDi_ja (or CROTAia) keywords are present, then the</span>
<a name="l00911"></a>00911 <span class="comment">* header is assumed to be in PCi_ja form whether or not any PCi_ja</span>
<a name="l00912"></a>00912 <span class="comment">* keywords are present since this results in an interpretation of</span>
<a name="l00913"></a>00913 <span class="comment">* CDELTia consistent with the original FITS specification.</span>
<a name="l00914"></a>00914 <span class="comment">*</span>
<a name="l00915"></a>00915 <span class="comment">* While CDi_ja may not formally co-exist with PCi_ja, it may co-exist</span>
<a name="l00916"></a>00916 <span class="comment">* with CDELTia and CROTAia which are to be ignored.</span>
<a name="l00917"></a>00917 <span class="comment">*</span>
<a name="l00918"></a>00918 <span class="comment">* - Bit 2: CROTAia is present.</span>
<a name="l00919"></a>00919 <span class="comment">*</span>
<a name="l00920"></a>00920 <span class="comment">* In the AIPS convention, CROTAia may only be</span>
<a name="l00921"></a>00921 <span class="comment">* associated with the latitude axis of a celestial axis pair. It</span>
<a name="l00922"></a>00922 <span class="comment">* specifies a rotation in the image plane that is applied AFTER the</span>
<a name="l00923"></a>00923 <span class="comment">* CDELTia; any other CROTAia keywords are ignored.</span>
<a name="l00924"></a>00924 <span class="comment">*</span>
<a name="l00925"></a>00925 <span class="comment">* CROTAia may not formally co-exist with PCi_ja.</span>
<a name="l00926"></a>00926 <span class="comment">*</span>
<a name="l00927"></a>00927 <span class="comment">* CROTAia and CDELTia may formally co-exist with CDi_ja but if so are to</span>
<a name="l00928"></a>00928 <span class="comment">* be ignored.</span>
<a name="l00929"></a>00929 <span class="comment">*</span>
<a name="l00930"></a>00930 <span class="comment">* CDi_ja and CROTAia keywords, if found, are to be stored in the</span>
<a name="l00931"></a>00931 <span class="comment">* wcsprm::cd and wcsprm::crota arrays which are dimensioned similarly to</span>
<a name="l00932"></a>00932 <span class="comment">* wcsprm::pc and wcsprm::cdelt. FITS</span>
<a name="l00933"></a>00933 <span class="comment">* header parsers should use the following procedure:</span>
<a name="l00934"></a>00934 <span class="comment">*</span>
<a name="l00935"></a>00935 <span class="comment">* - Whenever a PCi_ja keyword is encountered: altlin |= 1;</span>
<a name="l00936"></a>00936 <span class="comment">*</span>
<a name="l00937"></a>00937 <span class="comment">* - Whenever a CDi_ja keyword is encountered: altlin |= 2;</span>
<a name="l00938"></a>00938 <span class="comment">*</span>
<a name="l00939"></a>00939 <span class="comment">* - Whenever a CROTAia keyword is encountered: altlin |= 4;</span>
<a name="l00940"></a>00940 <span class="comment">*</span>
<a name="l00941"></a>00941 <span class="comment">* If none of these bits are set the PCi_ja representation results, i.e.</span>
<a name="l00942"></a>00942 <span class="comment">* wcsprm::pc and wcsprm::cdelt will be used as given.</span>
<a name="l00943"></a>00943 <span class="comment">*</span>
<a name="l00944"></a>00944 <span class="comment">* These alternate specifications of the linear transformation matrix are</span>
<a name="l00945"></a>00945 <span class="comment">* translated immediately to PCi_ja by wcsset() and are invisible to the</span>
<a name="l00946"></a>00946 <span class="comment">* lower-level WCSLIB routines. In particular, wcsset() resets</span>
<a name="l00947"></a>00947 <span class="comment">* wcsprm::cdelt to unity if CDi_ja is present (and no PCi_ja).</span>
<a name="l00948"></a>00948 <span class="comment">*</span>
<a name="l00949"></a>00949 <span class="comment">* If CROTAia are present but none is associated with the latitude axis</span>
<a name="l00950"></a>00950 <span class="comment">* (and no PCi_ja or CDi_ja), then wcsset() reverts to a unity PCi_ja</span>
<a name="l00951"></a>00951 <span class="comment">* matrix.</span>
<a name="l00952"></a>00952 <span class="comment">*</span>
<a name="l00953"></a>00953 <span class="comment">* int velref</span>
<a name="l00954"></a>00954 <span class="comment">* (Given) AIPS velocity code VELREF, refer to spcaips().</span>
<a name="l00955"></a>00955 <span class="comment">*</span>
<a name="l00956"></a>00956 <span class="comment">* char alt[4]</span>
<a name="l00957"></a>00957 <span class="comment">* (Given, auxiliary) Character code for alternate coordinate descriptions</span>
<a name="l00958"></a>00958 <span class="comment">* (i.e. the 'a' in keyword names such as CTYPEia). This is blank for the</span>
<a name="l00959"></a>00959 <span class="comment">* primary coordinate description, or one of the 26 upper-case letters,</span>
<a name="l00960"></a>00960 <span class="comment">* A-Z.</span>
<a name="l00961"></a>00961 <span class="comment">*</span>
<a name="l00962"></a>00962 <span class="comment">* An array of four characters is provided for alignment purposes, only the</span>
<a name="l00963"></a>00963 <span class="comment">* first is used.</span>
<a name="l00964"></a>00964 <span class="comment">*</span>
<a name="l00965"></a>00965 <span class="comment">* int colnum</span>
<a name="l00966"></a>00966 <span class="comment">* (Given, auxiliary) Where the coordinate representation is associated</span>
<a name="l00967"></a>00967 <span class="comment">* with an image-array column in a FITS binary table, this variable may be</span>
<a name="l00968"></a>00968 <span class="comment">* used to record the relevant column number.</span>
<a name="l00969"></a>00969 <span class="comment">*</span>
<a name="l00970"></a>00970 <span class="comment">* It should be set to zero for an image header or pixel list.</span>
<a name="l00971"></a>00971 <span class="comment">*</span>
<a name="l00972"></a>00972 <span class="comment">* int *colax</span>
<a name="l00973"></a>00973 <span class="comment">* (Given, auxiliary) Address of the first element of an array of int</span>
<a name="l00974"></a>00974 <span class="comment">* recording the column numbers for each axis in a pixel list.</span>
<a name="l00975"></a>00975 <span class="comment">*</span>
<a name="l00976"></a>00976 <span class="comment">* The array elements should be set to zero for an image header or image</span>
<a name="l00977"></a>00977 <span class="comment">* array in a binary table.</span>
<a name="l00978"></a>00978 <span class="comment">*</span>
<a name="l00979"></a>00979 <span class="comment">* char (*cname)[72]</span>
<a name="l00980"></a>00980 <span class="comment">* (Given, auxiliary) The address of the first element of an array of</span>
<a name="l00981"></a>00981 <span class="comment">* char[72] containing the coordinate axis names, CNAMEia.</span>
<a name="l00982"></a>00982 <span class="comment">*</span>
<a name="l00983"></a>00983 <span class="comment">* These variables accomodate the longest allowed string-valued FITS</span>
<a name="l00984"></a>00984 <span class="comment">* keyword, being limited to 68 characters, plus the null-terminating</span>
<a name="l00985"></a>00985 <span class="comment">* character.</span>
<a name="l00986"></a>00986 <span class="comment">*</span>
<a name="l00987"></a>00987 <span class="comment">* double *crder</span>
<a name="l00988"></a>00988 <span class="comment">* (Given, auxiliary) Address of the first element of an array of double</span>
<a name="l00989"></a>00989 <span class="comment">* recording the random error in the coordinate value, CRDERia.</span>
<a name="l00990"></a>00990 <span class="comment">* double *csyer</span>
<a name="l00991"></a>00991 <span class="comment">* (Given, auxiliary) Address of the first element of an array of double</span>
<a name="l00992"></a>00992 <span class="comment">* recording the systematic error in the coordinate value, CSYERia.</span>
<a name="l00993"></a>00993 <span class="comment">*</span>
<a name="l00994"></a>00994 <span class="comment">* char dateavg[72]</span>
<a name="l00995"></a>00995 <span class="comment">* (Given, auxiliary) The date of a representative mid-point of the</span>
<a name="l00996"></a>00996 <span class="comment">* observation in ISO format, yyyy-mm-ddThh:mm:ss.</span>
<a name="l00997"></a>00997 <span class="comment">* char dateobs[72]</span>
<a name="l00998"></a>00998 <span class="comment">* (Given, auxiliary) The date of the start of the observation unless</span>
<a name="l00999"></a>00999 <span class="comment">* otherwise explained in the comment field of the DATE-OBS keyword, in</span>
<a name="l01000"></a>01000 <span class="comment">* ISO format, yyyy-mm-ddThh:mm:ss.</span>
<a name="l01001"></a>01001 <span class="comment">*</span>
<a name="l01002"></a>01002 <span class="comment">* double equinox</span>
<a name="l01003"></a>01003 <span class="comment">* (Given, auxiliary) The equinox associated with dynamical equatorial or</span>
<a name="l01004"></a>01004 <span class="comment">* ecliptic coordinate systems, EQUINOXa (or EPOCH in older headers). Not</span>
<a name="l01005"></a>01005 <span class="comment">* applicable to ICRS equatorial or ecliptic coordinates.</span>
<a name="l01006"></a>01006 <span class="comment">*</span>
<a name="l01007"></a>01007 <span class="comment">* double mjdavg</span>
<a name="l01008"></a>01008 <span class="comment">* (Given, auxiliary) Modified Julian Date (MJD = JD - 2400000.5), MJD-AVG,</span>
<a name="l01009"></a>01009 <span class="comment">* corresponding to DATE-AVG.</span>
<a name="l01010"></a>01010 <span class="comment">* double mjdobs</span>
<a name="l01011"></a>01011 <span class="comment">* (Given, auxiliary) Modified Julian Date (MJD = JD - 2400000.5), MJD-OBS,</span>
<a name="l01012"></a>01012 <span class="comment">* corresponding to DATE-OBS.</span>
<a name="l01013"></a>01013 <span class="comment">*</span>
<a name="l01014"></a>01014 <span class="comment">* double obsgeo[3]</span>
<a name="l01015"></a>01015 <span class="comment">* (Given, auxiliary) Location of the observer in a standard terrestrial</span>
<a name="l01016"></a>01016 <span class="comment">* reference frame, OBSGEO-X, OBSGEO-Y, OBSGEO-Z [m].</span>
<a name="l01017"></a>01017 <span class="comment">*</span>
<a name="l01018"></a>01018 <span class="comment">* char radesys[72]</span>
<a name="l01019"></a>01019 <span class="comment">* (Given, auxiliary) The equatorial or ecliptic coordinate system type,</span>
<a name="l01020"></a>01020 <span class="comment">* RADESYSa.</span>
<a name="l01021"></a>01021 <span class="comment">*</span>
<a name="l01022"></a>01022 <span class="comment">* char specsys[72]</span>
<a name="l01023"></a>01023 <span class="comment">* (Given, auxiliary) Spectral reference frame (standard of rest),</span>
<a name="l01024"></a>01024 <span class="comment">* SPECSYSa, and ...</span>
<a name="l01025"></a>01025 <span class="comment">* char ssysobs[72]</span>
<a name="l01026"></a>01026 <span class="comment">* (Given, auxiliary) ... the actual frame in which there is no</span>
<a name="l01027"></a>01027 <span class="comment">* differential variation in the spectral coordinate across the</span>
<a name="l01028"></a>01028 <span class="comment">* field-of-view, SSYSOBSa.</span>
<a name="l01029"></a>01029 <span class="comment">* double velosys</span>
<a name="l01030"></a>01030 <span class="comment">* (Given, auxiliary) The relative radial velocity [m/s] between the</span>
<a name="l01031"></a>01031 <span class="comment">* observer and the selected standard of rest in the direction of the</span>
<a name="l01032"></a>01032 <span class="comment">* celestial reference coordinate, VELOSYSa.</span>
<a name="l01033"></a>01033 <span class="comment">*</span>
<a name="l01034"></a>01034 <span class="comment">* double zsource</span>
<a name="l01035"></a>01035 <span class="comment">* (Given, auxiliary) The redshift, ZSOURCEa, of the source, and ...</span>
<a name="l01036"></a>01036 <span class="comment">* char ssyssrc[72]</span>
<a name="l01037"></a>01037 <span class="comment">* (Given, auxiliary) ... the spectral reference frame (standard of rest)</span>
<a name="l01038"></a>01038 <span class="comment">* in which this was measured, SSYSSRCa.</span>
<a name="l01039"></a>01039 <span class="comment">*</span>
<a name="l01040"></a>01040 <span class="comment">* double velangl</span>
<a name="l01041"></a>01041 <span class="comment">* (Given, auxiliary) The angle [deg] that should be used to decompose an</span>
<a name="l01042"></a>01042 <span class="comment">* observed velocity into radial and transverse components.</span>
<a name="l01043"></a>01043 <span class="comment">*</span>
<a name="l01044"></a>01044 <span class="comment">* char wcsname[72]</span>
<a name="l01045"></a>01045 <span class="comment">* (Given, auxiliary) The name given to the coordinate representation,</span>
<a name="l01046"></a>01046 <span class="comment">* WCSNAMEa. This variable accomodates the longest allowed string-valued</span>
<a name="l01047"></a>01047 <span class="comment">* FITS keyword, being limited to 68 characters, plus the null-terminating</span>
<a name="l01048"></a>01048 <span class="comment">* character.</span>
<a name="l01049"></a>01049 <span class="comment">*</span>
<a name="l01050"></a>01050 <span class="comment">* int ntab</span>
<a name="l01051"></a>01051 <span class="comment">* (Given) See wcsprm::tab.</span>
<a name="l01052"></a>01052 <span class="comment">*</span>
<a name="l01053"></a>01053 <span class="comment">* int nwtb</span>
<a name="l01054"></a>01054 <span class="comment">* (Given) See wcsprm::wtb.</span>
<a name="l01055"></a>01055 <span class="comment">*</span>
<a name="l01056"></a>01056 <span class="comment">* struct tabprm *tab</span>
<a name="l01057"></a>01057 <span class="comment">* (Given) Address of the first element of an array of ntab tabprm structs</span>
<a name="l01058"></a>01058 <span class="comment">* for which memory has been allocated. These are used to store tabular</span>
<a name="l01059"></a>01059 <span class="comment">* transformation parameters.</span>
<a name="l01060"></a>01060 <span class="comment">*</span>
<a name="l01061"></a>01061 <span class="comment">* Although technically wcsprm::ntab and tab are "given", they will</span>
<a name="l01062"></a>01062 <span class="comment">* normally be set by invoking wcstab(), whether directly or indirectly.</span>
<a name="l01063"></a>01063 <span class="comment">*</span>
<a name="l01064"></a>01064 <span class="comment">* The tabprm structs contain some members that must be supplied and others</span>
<a name="l01065"></a>01065 <span class="comment">* that are derived. The information to be supplied comes primarily from</span>
<a name="l01066"></a>01066 <span class="comment">* arrays stored in one or more FITS binary table extensions. These</span>
<a name="l01067"></a>01067 <span class="comment">* arrays, referred to here as "wcstab arrays", are themselves located by</span>
<a name="l01068"></a>01068 <span class="comment">* parameters stored in the FITS image header.</span>
<a name="l01069"></a>01069 <span class="comment">*</span>
<a name="l01070"></a>01070 <span class="comment">* struct wtbarr *wtb</span>
<a name="l01071"></a>01071 <span class="comment">* (Given) Address of the first element of an array of nwtb wtbarr structs</span>
<a name="l01072"></a>01072 <span class="comment">* for which memory has been allocated. These are used in extracting</span>
<a name="l01073"></a>01073 <span class="comment">* wcstab arrays from a FITS binary table.</span>
<a name="l01074"></a>01074 <span class="comment">*</span>
<a name="l01075"></a>01075 <span class="comment">* Although technically wcsprm::nwtb and wtb are "given", they will</span>
<a name="l01076"></a>01076 <span class="comment">* normally be set by invoking wcstab(), whether directly or indirectly.</span>
<a name="l01077"></a>01077 <span class="comment">*</span>
<a name="l01078"></a>01078 <span class="comment">* char lngtyp[8]</span>
<a name="l01079"></a>01079 <span class="comment">* (Returned) Four-character WCS celestial longitude and ...</span>
<a name="l01080"></a>01080 <span class="comment">* char lattyp[8]</span>
<a name="l01081"></a>01081 <span class="comment">* (Returned) ... latitude axis types. e.g. "RA", "DEC", "GLON", "GLAT",</span>
<a name="l01082"></a>01082 <span class="comment">* etc. extracted from 'RA--', 'DEC-', 'GLON', 'GLAT', etc. in the first</span>
<a name="l01083"></a>01083 <span class="comment">* four characters of CTYPEia but with trailing dashes removed. (Declared</span>
<a name="l01084"></a>01084 <span class="comment">* as char[8] for alignment reasons.)</span>
<a name="l01085"></a>01085 <span class="comment">*</span>
<a name="l01086"></a>01086 <span class="comment">* int lng</span>
<a name="l01087"></a>01087 <span class="comment">* (Returned) Index for the longitude coordinate, and ...</span>
<a name="l01088"></a>01088 <span class="comment">* int lat</span>
<a name="l01089"></a>01089 <span class="comment">* (Returned) ... index for the latitude coordinate, and ...</span>
<a name="l01090"></a>01090 <span class="comment">* int spec</span>
<a name="l01091"></a>01091 <span class="comment">* (Returned) ... index for the spectral coordinate in the imgcrd[][] and</span>
<a name="l01092"></a>01092 <span class="comment">* world[][] arrays in the API of wcsp2s(), wcss2p() and wcsmix().</span>
<a name="l01093"></a>01093 <span class="comment">*</span>
<a name="l01094"></a>01094 <span class="comment">* These may also serve as indices into the pixcrd[][] array provided that</span>
<a name="l01095"></a>01095 <span class="comment">* the PCi_ja matrix does not transpose axes.</span>
<a name="l01096"></a>01096 <span class="comment">*</span>
<a name="l01097"></a>01097 <span class="comment">* int cubeface</span>
<a name="l01098"></a>01098 <span class="comment">* (Returned) Index into the pixcrd[][] array for the CUBEFACE axis. This</span>
<a name="l01099"></a>01099 <span class="comment">* is used for quadcube projections where the cube faces are stored on a</span>
<a name="l01100"></a>01100 <span class="comment">* separate axis (see wcs.h).</span>
<a name="l01101"></a>01101 <span class="comment">*</span>
<a name="l01102"></a>01102 <span class="comment">* int *types</span>
<a name="l01103"></a>01103 <span class="comment">* (Returned) Address of the first element of an array of int containing a</span>
<a name="l01104"></a>01104 <span class="comment">* four-digit type code for each axis.</span>
<a name="l01105"></a>01105 <span class="comment">*</span>
<a name="l01106"></a>01106 <span class="comment">* - First digit (i.e. 1000s):</span>
<a name="l01107"></a>01107 <span class="comment">* - 0: Non-specific coordinate type.</span>
<a name="l01108"></a>01108 <span class="comment">* - 1: Stokes coordinate.</span>
<a name="l01109"></a>01109 <span class="comment">* - 2: Celestial coordinate (including CUBEFACE).</span>
<a name="l01110"></a>01110 <span class="comment">* - 3: Spectral coordinate.</span>
<a name="l01111"></a>01111 <span class="comment">*</span>
<a name="l01112"></a>01112 <span class="comment">* - Second digit (i.e. 100s):</span>
<a name="l01113"></a>01113 <span class="comment">* - 0: Linear axis.</span>
<a name="l01114"></a>01114 <span class="comment">* - 1: Quantized axis (STOKES, CUBEFACE).</span>
<a name="l01115"></a>01115 <span class="comment">* - 2: Non-linear celestial axis.</span>
<a name="l01116"></a>01116 <span class="comment">* - 3: Non-linear spectral axis.</span>
<a name="l01117"></a>01117 <span class="comment">* - 4: Logarithmic axis.</span>
<a name="l01118"></a>01118 <span class="comment">* - 5: Tabular axis.</span>
<a name="l01119"></a>01119 <span class="comment">*</span>
<a name="l01120"></a>01120 <span class="comment">* - Third digit (i.e. 10s):</span>
<a name="l01121"></a>01121 <span class="comment">* - 0: Group number, e.g. lookup table number, being an index into the</span>
<a name="l01122"></a>01122 <span class="comment">* tabprm array (see above).</span>
<a name="l01123"></a>01123 <span class="comment">*</span>
<a name="l01124"></a>01124 <span class="comment">* - The fourth digit is used as a qualifier depending on the axis type.</span>
<a name="l01125"></a>01125 <span class="comment">*</span>
<a name="l01126"></a>01126 <span class="comment">* - For celestial axes:</span>
<a name="l01127"></a>01127 <span class="comment">* - 0: Longitude coordinate.</span>
<a name="l01128"></a>01128 <span class="comment">* - 1: Latitude coordinate.</span>
<a name="l01129"></a>01129 <span class="comment">* - 2: CUBEFACE number.</span>
<a name="l01130"></a>01130 <span class="comment">*</span>
<a name="l01131"></a>01131 <span class="comment">* - For lookup tables: the axis number in a multidimensional table.</span>
<a name="l01132"></a>01132 <span class="comment">*</span>
<a name="l01133"></a>01133 <span class="comment">* CTYPEia in "4-3" form with unrecognized algorithm code will have its</span>
<a name="l01134"></a>01134 <span class="comment">* type set to -1 and generate an error.</span>
<a name="l01135"></a>01135 <span class="comment">*</span>
<a name="l01136"></a>01136 <span class="comment">* void *padding</span>
<a name="l01137"></a>01137 <span class="comment">* (An unused variable inserted for alignment purposes only.)</span>
<a name="l01138"></a>01138 <span class="comment">*</span>
<a name="l01139"></a>01139 <span class="comment">* struct linprm lin</span>
<a name="l01140"></a>01140 <span class="comment">* (Returned) Linear transformation parameters (usage is described in the</span>
<a name="l01141"></a>01141 <span class="comment">* prologue to lin.h).</span>
<a name="l01142"></a>01142 <span class="comment">*</span>
<a name="l01143"></a>01143 <span class="comment">* struct celprm cel</span>
<a name="l01144"></a>01144 <span class="comment">* (Returned) Celestial transformation parameters (usage is described in</span>
<a name="l01145"></a>01145 <span class="comment">* the prologue to cel.h).</span>
<a name="l01146"></a>01146 <span class="comment">*</span>
<a name="l01147"></a>01147 <span class="comment">* struct spcprm spc</span>
<a name="l01148"></a>01148 <span class="comment">* (Returned) Spectral transformation parameters (usage is described in the</span>
<a name="l01149"></a>01149 <span class="comment">* prologue to spc.h).</span>
<a name="l01150"></a>01150 <span class="comment">*</span>
<a name="l01151"></a>01151 <span class="comment">* struct wcserr *err</span>
<a name="l01152"></a>01152 <span class="comment">* (Returned) If enabled, when an error status is returned this struct</span>
<a name="l01153"></a>01153 <span class="comment">* contains detailed information about the error, see wcserr_enable().</span>
<a name="l01154"></a>01154 <span class="comment">*</span>
<a name="l01155"></a>01155 <span class="comment">* void *m_padding</span>
<a name="l01156"></a>01156 <span class="comment">* (For internal use only.)</span>
<a name="l01157"></a>01157 <span class="comment">* int m_flag</span>
<a name="l01158"></a>01158 <span class="comment">* (For internal use only.)</span>
<a name="l01159"></a>01159 <span class="comment">* int m_naxis</span>
<a name="l01160"></a>01160 <span class="comment">* (For internal use only.)</span>
<a name="l01161"></a>01161 <span class="comment">* double *m_crpix</span>
<a name="l01162"></a>01162 <span class="comment">* (For internal use only.)</span>
<a name="l01163"></a>01163 <span class="comment">* double *m_pc</span>
<a name="l01164"></a>01164 <span class="comment">* (For internal use only.)</span>
<a name="l01165"></a>01165 <span class="comment">* double *m_cdelt</span>
<a name="l01166"></a>01166 <span class="comment">* (For internal use only.)</span>
<a name="l01167"></a>01167 <span class="comment">* double *m_crval</span>
<a name="l01168"></a>01168 <span class="comment">* (For internal use only.)</span>
<a name="l01169"></a>01169 <span class="comment">* char (*m_cunit)[72]</span>
<a name="l01170"></a>01170 <span class="comment">* (For internal use only.)</span>
<a name="l01171"></a>01171 <span class="comment">* char (*m_ctype)[72]</span>
<a name="l01172"></a>01172 <span class="comment">* (For internal use only.)</span>
<a name="l01173"></a>01173 <span class="comment">* struct pvcard *m_pv</span>
<a name="l01174"></a>01174 <span class="comment">* (For internal use only.)</span>
<a name="l01175"></a>01175 <span class="comment">* struct pscard *m_ps</span>
<a name="l01176"></a>01176 <span class="comment">* (For internal use only.)</span>
<a name="l01177"></a>01177 <span class="comment">* double *m_cd</span>
<a name="l01178"></a>01178 <span class="comment">* (For internal use only.)</span>
<a name="l01179"></a>01179 <span class="comment">* double *m_crota</span>
<a name="l01180"></a>01180 <span class="comment">* (For internal use only.)</span>
<a name="l01181"></a>01181 <span class="comment">* int *m_colax</span>
<a name="l01182"></a>01182 <span class="comment">* (For internal use only.)</span>
<a name="l01183"></a>01183 <span class="comment">* char (*m_cname)[72]</span>
<a name="l01184"></a>01184 <span class="comment">* (For internal use only.)</span>
<a name="l01185"></a>01185 <span class="comment">* double *m_crder</span>
<a name="l01186"></a>01186 <span class="comment">* (For internal use only.)</span>
<a name="l01187"></a>01187 <span class="comment">* double *m_csyer</span>
<a name="l01188"></a>01188 <span class="comment">* (For internal use only.)</span>
<a name="l01189"></a>01189 <span class="comment">* struct tabprm *m_tab</span>
<a name="l01190"></a>01190 <span class="comment">* (For internal use only.)</span>
<a name="l01191"></a>01191 <span class="comment">* struct wtbarr *m_wtb</span>
<a name="l01192"></a>01192 <span class="comment">* (For internal use only.)</span>
<a name="l01193"></a>01193 <span class="comment">*</span>
<a name="l01194"></a>01194 <span class="comment">*</span>
<a name="l01195"></a>01195 <span class="comment">* pscard struct - Store for PSi_ma keyrecords</span>
<a name="l01196"></a>01196 <span class="comment">* -------------------------------------------</span>
<a name="l01197"></a>01197 <span class="comment">* The pscard struct is used to pass the parsed contents of PSi_ma keyrecords</span>
<a name="l01198"></a>01198 <span class="comment">* to wcsset() via the wcsprm struct.</span>
<a name="l01199"></a>01199 <span class="comment">*</span>
<a name="l01200"></a>01200 <span class="comment">* All members of this struct are to be set by the user.</span>
<a name="l01201"></a>01201 <span class="comment">*</span>
<a name="l01202"></a>01202 <span class="comment">* int i</span>
<a name="l01203"></a>01203 <span class="comment">* (Given) Axis number (1-relative), as in the FITS PSi_ma keyword.</span>
<a name="l01204"></a>01204 <span class="comment">*</span>
<a name="l01205"></a>01205 <span class="comment">* int m</span>
<a name="l01206"></a>01206 <span class="comment">* (Given) Parameter number (non-negative), as in the FITS PSi_ma keyword.</span>
<a name="l01207"></a>01207 <span class="comment">*</span>
<a name="l01208"></a>01208 <span class="comment">* char value[72]</span>
<a name="l01209"></a>01209 <span class="comment">* (Given) Parameter value.</span>
<a name="l01210"></a>01210 <span class="comment">*</span>
<a name="l01211"></a>01211 <span class="comment">*</span>
<a name="l01212"></a>01212 <span class="comment">* pvcard struct - Store for PVi_ma keyrecords</span>
<a name="l01213"></a>01213 <span class="comment">* -------------------------------------------</span>
<a name="l01214"></a>01214 <span class="comment">* The pvcard struct is used to pass the parsed contents of PVi_ma keyrecords</span>
<a name="l01215"></a>01215 <span class="comment">* to wcsset() via the wcsprm struct.</span>
<a name="l01216"></a>01216 <span class="comment">*</span>
<a name="l01217"></a>01217 <span class="comment">* All members of this struct are to be set by the user.</span>
<a name="l01218"></a>01218 <span class="comment">*</span>
<a name="l01219"></a>01219 <span class="comment">* int i</span>
<a name="l01220"></a>01220 <span class="comment">* (Given) Axis number (1-relative), as in the FITS PVi_ma keyword.</span>
<a name="l01221"></a>01221 <span class="comment">*</span>
<a name="l01222"></a>01222 <span class="comment">* int m</span>
<a name="l01223"></a>01223 <span class="comment">* (Given) Parameter number (non-negative), as in the FITS PVi_ma keyword.</span>
<a name="l01224"></a>01224 <span class="comment">*</span>
<a name="l01225"></a>01225 <span class="comment">* double value</span>
<a name="l01226"></a>01226 <span class="comment">* (Given) Parameter value.</span>
<a name="l01227"></a>01227 <span class="comment">*</span>
<a name="l01228"></a>01228 <span class="comment">*</span>
<a name="l01229"></a>01229 <span class="comment">* wtbarr struct - Extraction of coordinate lookup tables from BINTABLE</span>
<a name="l01230"></a>01230 <span class="comment">* --------------------------------------------------------------------</span>
<a name="l01231"></a>01231 <span class="comment">* Function wcstab(), which is invoked automatically by wcspih(), sets up an</span>
<a name="l01232"></a>01232 <span class="comment">* array of wtbarr structs to assist in extracting coordinate lookup tables</span>
<a name="l01233"></a>01233 <span class="comment">* from a binary table extension (BINTABLE) and copying them into the tabprm</span>
<a name="l01234"></a>01234 <span class="comment">* structs stored in wcsprm. Refer to the usage notes for wcspih() and</span>
<a name="l01235"></a>01235 <span class="comment">* wcstab() in wcshdr.h, and also the prologue to tab.h.</span>
<a name="l01236"></a>01236 <span class="comment">*</span>
<a name="l01237"></a>01237 <span class="comment">* For C++ usage, because of a name space conflict with the wtbarr typedef</span>
<a name="l01238"></a>01238 <span class="comment">* defined in CFITSIO header fitsio.h, the wtbarr struct is renamed to wtbarr_s</span>
<a name="l01239"></a>01239 <span class="comment">* by preprocessor macro substitution with scope limited to wcs.h itself.</span>
<a name="l01240"></a>01240 <span class="comment">*</span>
<a name="l01241"></a>01241 <span class="comment">* int i</span>
<a name="l01242"></a>01242 <span class="comment">* (Given) Image axis number.</span>
<a name="l01243"></a>01243 <span class="comment">*</span>
<a name="l01244"></a>01244 <span class="comment">* int m</span>
<a name="l01245"></a>01245 <span class="comment">* (Given) wcstab array axis number for index vectors.</span>
<a name="l01246"></a>01246 <span class="comment">*</span>
<a name="l01247"></a>01247 <span class="comment">* int kind</span>
<a name="l01248"></a>01248 <span class="comment">* (Given) Character identifying the wcstab array type:</span>
<a name="l01249"></a>01249 <span class="comment">* - c: coordinate array,</span>
<a name="l01250"></a>01250 <span class="comment">* - i: index vector.</span>
<a name="l01251"></a>01251 <span class="comment">*</span>
<a name="l01252"></a>01252 <span class="comment">* char extnam[72]</span>
<a name="l01253"></a>01253 <span class="comment">* (Given) EXTNAME identifying the binary table extension.</span>
<a name="l01254"></a>01254 <span class="comment">*</span>
<a name="l01255"></a>01255 <span class="comment">* int extver</span>
<a name="l01256"></a>01256 <span class="comment">* (Given) EXTVER identifying the binary table extension.</span>
<a name="l01257"></a>01257 <span class="comment">*</span>
<a name="l01258"></a>01258 <span class="comment">* int extlev</span>
<a name="l01259"></a>01259 <span class="comment">* (Given) EXTLEV identifying the binary table extension.</span>
<a name="l01260"></a>01260 <span class="comment">*</span>
<a name="l01261"></a>01261 <span class="comment">* char ttype[72]</span>
<a name="l01262"></a>01262 <span class="comment">* (Given) TTYPEn identifying the column of the binary table that contains</span>
<a name="l01263"></a>01263 <span class="comment">* the wcstab array.</span>
<a name="l01264"></a>01264 <span class="comment">*</span>
<a name="l01265"></a>01265 <span class="comment">* long row</span>
<a name="l01266"></a>01266 <span class="comment">* (Given) Table row number.</span>
<a name="l01267"></a>01267 <span class="comment">*</span>
<a name="l01268"></a>01268 <span class="comment">* int ndim</span>
<a name="l01269"></a>01269 <span class="comment">* (Given) Expected dimensionality of the wcstab array.</span>
<a name="l01270"></a>01270 <span class="comment">*</span>
<a name="l01271"></a>01271 <span class="comment">* int *dimlen</span>
<a name="l01272"></a>01272 <span class="comment">* (Given) Address of the first element of an array of int of length ndim</span>
<a name="l01273"></a>01273 <span class="comment">* into which the wcstab array axis lengths are to be written.</span>
<a name="l01274"></a>01274 <span class="comment">*</span>
<a name="l01275"></a>01275 <span class="comment">* double **arrayp</span>
<a name="l01276"></a>01276 <span class="comment">* (Given) Pointer to an array of double which is to be allocated by the</span>
<a name="l01277"></a>01277 <span class="comment">* user and into which the wcstab array is to be written.</span>
<a name="l01278"></a>01278 <span class="comment">*</span>
<a name="l01279"></a>01279 <span class="comment">*</span>
<a name="l01280"></a>01280 <span class="comment">* Global variable: const char *wcs_errmsg[] - Status return messages</span>
<a name="l01281"></a>01281 <span class="comment">* ------------------------------------------------------------------</span>
<a name="l01282"></a>01282 <span class="comment">* Error messages to match the status value returned from each function.</span>
<a name="l01283"></a>01283 <span class="comment">*</span>
<a name="l01284"></a>01284 <span class="comment">*===========================================================================*/</span>
<a name="l01285"></a>01285
<a name="l01286"></a>01286 <span class="preprocessor">#ifndef WCSLIB_WCS</span>
<a name="l01287"></a>01287 <span class="preprocessor"></span><span class="preprocessor">#define WCSLIB_WCS</span>
<a name="l01288"></a>01288 <span class="preprocessor"></span>
<a name="l01289"></a>01289 <span class="preprocessor">#include "<a class="code" href="lin_8h.html">lin.h</a>"</span>
<a name="l01290"></a>01290 <span class="preprocessor">#include "<a class="code" href="cel_8h.html">cel.h</a>"</span>
<a name="l01291"></a>01291 <span class="preprocessor">#include "<a class="code" href="spc_8h.html">spc.h</a>"</span>
<a name="l01292"></a>01292 <span class="preprocessor">#include "<a class="code" href="tab_8h.html">tab.h</a>"</span>
<a name="l01293"></a>01293 <span class="preprocessor">#include "<a class="code" href="wcserr_8h.html">wcserr.h</a>"</span>
<a name="l01294"></a>01294
<a name="l01295"></a>01295 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l01296"></a>01296 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {
<a name="l01297"></a>01297 <span class="preprocessor">#endif</span>
<a name="l01298"></a>01298 <span class="preprocessor"></span>
<a name="l01299"></a><a class="code" href="wcs_8h.html#0653c98b8a1bee5755740ae3f4854094">01299</a> <span class="preprocessor">#define WCSSUB_LONGITUDE 0x1001</span>
<a name="l01300"></a><a class="code" href="wcs_8h.html#5d377c202850ee0eaf44b3e989d0736e">01300</a> <span class="preprocessor"></span><span class="preprocessor">#define WCSSUB_LATITUDE 0x1002</span>
<a name="l01301"></a><a class="code" href="wcs_8h.html#22bbac394b025c4cfc7bd73b6d6e3962">01301</a> <span class="preprocessor"></span><span class="preprocessor">#define WCSSUB_CUBEFACE 0x1004</span>
<a name="l01302"></a><a class="code" href="wcs_8h.html#b9885b02031ff7aa7b094f4a1edee2cd">01302</a> <span class="preprocessor"></span><span class="preprocessor">#define WCSSUB_CELESTIAL 0x1007</span>
<a name="l01303"></a><a class="code" href="wcs_8h.html#4b2dfca2e80fe80ba85dc830cd9c377b">01303</a> <span class="preprocessor"></span><span class="preprocessor">#define WCSSUB_SPECTRAL 0x1008</span>
<a name="l01304"></a><a class="code" href="wcs_8h.html#6ba6d2640572b12a11e3558fa75a01ed">01304</a> <span class="preprocessor"></span><span class="preprocessor">#define WCSSUB_STOKES 0x1010</span>
<a name="l01305"></a>01305 <span class="preprocessor"></span>
<a name="l01306"></a>01306
<a name="l01307"></a>01307 <span class="keyword">extern</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code" href="wcs_8h.html#d16bd8db875ee05b014429efdc1f3471" title="Status return messages.">wcs_errmsg</a>[];
<a name="l01308"></a>01308
<a name="l01309"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f">01309</a> <span class="keyword">enum</span> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f">wcs_errmsg_enum</a> {
<a name="l01310"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f8b87c21d4a2cab41d4eea0a95378fca8">01310</a> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f8b87c21d4a2cab41d4eea0a95378fca8">WCSERR_SUCCESS</a> = 0, <span class="comment">/* Success. */</span>
<a name="l01311"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25fc51c733d8a719dd698f9e96e9a4fa83f">01311</a> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25fc51c733d8a719dd698f9e96e9a4fa83f">WCSERR_NULL_POINTER</a> = 1, <span class="comment">/* Null wcsprm pointer passed. */</span>
<a name="l01312"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f5c58d5530bc7577a70185376c15180af">01312</a> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f5c58d5530bc7577a70185376c15180af">WCSERR_MEMORY</a> = 2, <span class="comment">/* Memory allocation failed. */</span>
<a name="l01313"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f2904278d916c820236347783312a7ce0">01313</a> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f2904278d916c820236347783312a7ce0">WCSERR_SINGULAR_MTX</a> = 3, <span class="comment">/* Linear transformation matrix is</span>
<a name="l01314"></a>01314 <span class="comment"> singular. */</span>
<a name="l01315"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f598db0fcc4961aa3c5e0a296bec2b313">01315</a> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f598db0fcc4961aa3c5e0a296bec2b313">WCSERR_BAD_CTYPE</a> = 4, <span class="comment">/* Inconsistent or unrecognized coordinate</span>
<a name="l01316"></a>01316 <span class="comment"> axis types. */</span>
<a name="l01317"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25ffe9ed842ea8f525c7b8fed2f60015dd9">01317</a> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25ffe9ed842ea8f525c7b8fed2f60015dd9">WCSERR_BAD_PARAM</a> = 5, <span class="comment">/* Invalid parameter value. */</span>
<a name="l01318"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f71cb7eaa633d9e0f560555a016f1f007">01318</a> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f71cb7eaa633d9e0f560555a016f1f007">WCSERR_BAD_COORD_TRANS</a> = 6, <span class="comment">/* Invalid coordinate transformation</span>
<a name="l01319"></a>01319 <span class="comment"> parameters. */</span>
<a name="l01320"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25fdfa2a8cf8021827378091315b8e0a020">01320</a> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25fdfa2a8cf8021827378091315b8e0a020">WCSERR_ILL_COORD_TRANS</a> = 7, <span class="comment">/* Ill-conditioned coordinate transformation</span>
<a name="l01321"></a>01321 <span class="comment"> parameters. */</span>
<a name="l01322"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f08306533cf0c7555dad662e82e8a4a69">01322</a> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f08306533cf0c7555dad662e82e8a4a69">WCSERR_BAD_PIX</a> = 8, <span class="comment">/* One or more of the pixel coordinates were</span>
<a name="l01323"></a>01323 <span class="comment"> invalid. */</span>
<a name="l01324"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f03824b7b5c22e5f0cc91363eb695a804">01324</a> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f03824b7b5c22e5f0cc91363eb695a804">WCSERR_BAD_WORLD</a> = 9, <span class="comment">/* One or more of the world coordinates were</span>
<a name="l01325"></a>01325 <span class="comment"> invalid. */</span>
<a name="l01326"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f5d662102c172495df1f9bb03cedd701d">01326</a> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f5d662102c172495df1f9bb03cedd701d">WCSERR_BAD_WORLD_COORD</a> = 10, <span class="comment">/* Invalid world coordinate. */</span>
<a name="l01327"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f832122bb304560f92df91e391d55948a">01327</a> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f832122bb304560f92df91e391d55948a">WCSERR_NO_SOLUTION</a> = 11, <span class="comment">/* No solution found in the specified</span>
<a name="l01328"></a>01328 <span class="comment"> interval. */</span>
<a name="l01329"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f88e600163f719a759d3569bf1548109e">01329</a> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f88e600163f719a759d3569bf1548109e">WCSERR_BAD_SUBIMAGE</a> = 12, <span class="comment">/* Invalid subimage specification. */</span>
<a name="l01330"></a><a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f37c8aa0aedc12c63df08f39cb7177ff7">01330</a> <a class="code" href="wcs_8h.html#158615aa1622d8feedd228795ff9a25f37c8aa0aedc12c63df08f39cb7177ff7">WCSERR_NON_SEPARABLE</a> = 13 <span class="comment">/* Non-separable subimage coordinate</span>
<a name="l01331"></a>01331 <span class="comment"> system. */</span>
<a name="l01332"></a>01332 };
<a name="l01333"></a>01333
<a name="l01334"></a>01334
<a name="l01335"></a>01335 <span class="comment">/* Struct used for storing PVi_ma keywords. */</span>
<a name="l01336"></a><a class="code" href="structpvcard.html">01336</a> <span class="keyword">struct </span><a class="code" href="structpvcard.html" title="Store for PVi_ma keyrecords.">pvcard</a> {
<a name="l01337"></a><a class="code" href="structpvcard.html#88fa516543184eaffe6bd2c57946d9a7">01337</a> <span class="keywordtype">int</span> <a class="code" href="structpvcard.html#88fa516543184eaffe6bd2c57946d9a7">i</a>; <span class="comment">/* Axis number, as in PVi_ma (1-relative). */</span>
<a name="l01338"></a><a class="code" href="structpvcard.html#f011f1972d6d345540f36a5c08a30d1f">01338</a> <span class="keywordtype">int</span> <a class="code" href="structpvcard.html#f011f1972d6d345540f36a5c08a30d1f">m</a>; <span class="comment">/* Parameter number, ditto (0-relative). */</span>
<a name="l01339"></a><a class="code" href="structpvcard.html#5c97562bbadb55b8a2db59d9c7878059">01339</a> <span class="keywordtype">double</span> <a class="code" href="structpvcard.html#5c97562bbadb55b8a2db59d9c7878059">value</a>; <span class="comment">/* Parameter value. */</span>
<a name="l01340"></a>01340 };
<a name="l01341"></a>01341
<a name="l01342"></a>01342 <span class="comment">/* Struct used for storing PSi_ma keywords. */</span>
<a name="l01343"></a><a class="code" href="structpscard.html">01343</a> <span class="keyword">struct </span><a class="code" href="structpscard.html" title="Store for PSi_ma keyrecords.">pscard</a> {
<a name="l01344"></a><a class="code" href="structpscard.html#37a06c885cf73736f2eb5e78bd1034a1">01344</a> <span class="keywordtype">int</span> <a class="code" href="structpscard.html#37a06c885cf73736f2eb5e78bd1034a1">i</a>; <span class="comment">/* Axis number, as in PSi_ma (1-relative). */</span>
<a name="l01345"></a><a class="code" href="structpscard.html#71912f084bc3cadeb0758756a723071a">01345</a> <span class="keywordtype">int</span> <a class="code" href="structpscard.html#71912f084bc3cadeb0758756a723071a">m</a>; <span class="comment">/* Parameter number, ditto (0-relative). */</span>
<a name="l01346"></a><a class="code" href="structpscard.html#9986f2ace84978f6cc543224b57592c9">01346</a> <span class="keywordtype">char</span> <a class="code" href="structpscard.html#9986f2ace84978f6cc543224b57592c9">value</a>[72]; <span class="comment">/* Parameter value. */</span>
<a name="l01347"></a>01347 };
<a name="l01348"></a>01348
<a name="l01349"></a>01349 <span class="comment">/* For extracting wcstab arrays. Matches */</span>
<a name="l01350"></a>01350 <span class="comment">/* the wtbarr typedef defined in CFITSIO */</span>
<a name="l01351"></a>01351 <span class="comment">/* header fitsio.h. */</span>
<a name="l01352"></a>01352 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l01353"></a>01353 <span class="preprocessor"></span><span class="preprocessor">#define wtbarr wtbarr_s </span><span class="comment">/* See prologue above. */</span>
<a name="l01354"></a>01354 <span class="preprocessor">#endif</span>
<a name="l01355"></a>01355 <span class="preprocessor"></span><span class="keyword">struct </span><a class="code" href="structwtbarr.html" title="Extraction of coordinate lookup tables from BINTABLE.">wtbarr</a> {
<a name="l01356"></a>01356 <span class="keywordtype">int</span> <a class="code" href="structwtbarr.html#8743b84c99b4b5e7ab7bf0653507a180">i</a>; <span class="comment">/* Image axis number. */</span>
<a name="l01357"></a>01357 <span class="keywordtype">int</span> <a class="code" href="structwtbarr.html#1e88ad32570534a006e96cba721489b5">m</a>; <span class="comment">/* Array axis number for index vectors. */</span>
<a name="l01358"></a>01358 <span class="keywordtype">int</span> <a class="code" href="structwtbarr.html#f8ea7b15992ab7a86be63ff83318be41">kind</a>; <span class="comment">/* wcstab array type. */</span>
<a name="l01359"></a>01359 <span class="keywordtype">char</span> <a class="code" href="structwtbarr.html#9f1fcad814aa3da08dfa75ede2a07deb">extnam</a>[72]; <span class="comment">/* EXTNAME of binary table extension. */</span>
<a name="l01360"></a>01360 <span class="keywordtype">int</span> <a class="code" href="structwtbarr.html#24487eda7b17800f41bd4a452c6306d5">extver</a>; <span class="comment">/* EXTVER of binary table extension. */</span>
<a name="l01361"></a>01361 <span class="keywordtype">int</span> <a class="code" href="structwtbarr.html#10c8dba85b62e2794071dd50a41c4bb1">extlev</a>; <span class="comment">/* EXTLEV of binary table extension. */</span>
<a name="l01362"></a>01362 <span class="keywordtype">char</span> <a class="code" href="structwtbarr.html#750832793167bbeebd1074e29844415d">ttype</a>[72]; <span class="comment">/* TTYPEn of column containing the array. */</span>
<a name="l01363"></a>01363 <span class="keywordtype">long</span> <a class="code" href="structwtbarr.html#2ff7c235353320c6dd98951484012ee7">row</a>; <span class="comment">/* Table row number. */</span>
<a name="l01364"></a>01364 <span class="keywordtype">int</span> <a class="code" href="structwtbarr.html#f862b4f90b0406ed8dd0c240768d4bd3">ndim</a>; <span class="comment">/* Expected wcstab array dimensionality. */</span>
<a name="l01365"></a>01365 <span class="keywordtype">int</span> *<a class="code" href="structwtbarr.html#901403d05f985d4a1fbd2fdc9585bd50">dimlen</a>; <span class="comment">/* Where to write the array axis lengths. */</span>
<a name="l01366"></a>01366 <span class="keywordtype">double</span> **<a class="code" href="structwtbarr.html#41c30234dbdf18ac094872cf39562172">arrayp</a>; <span class="comment">/* Where to write the address of the array */</span>
<a name="l01367"></a>01367 <span class="comment">/* allocated to store the wcstab array. */</span>
<a name="l01368"></a>01368 };
<a name="l01369"></a>01369
<a name="l01370"></a>01370
<a name="l01371"></a><a class="code" href="structwcsprm.html">01371</a> <span class="keyword">struct </span><a class="code" href="structwcsprm.html" title="Coordinate transformation parameters.">wcsprm</a> {
<a name="l01372"></a>01372 <span class="comment">/* Initialization flag (see the prologue above). */</span>
<a name="l01373"></a>01373 <span class="comment">/*------------------------------------------------------------------------*/</span>
<a name="l01374"></a><a class="code" href="structwcsprm.html#35bff8de85e5a8892e1b68db69ca7a68">01374</a> <span class="keywordtype">int</span> <a class="code" href="structwcsprm.html#35bff8de85e5a8892e1b68db69ca7a68">flag</a>; <span class="comment">/* Set to zero to force initialization. */</span>
<a name="l01375"></a>01375
<a name="l01376"></a>01376 <span class="comment">/* FITS header keyvalues to be provided (see the prologue above). */</span>
<a name="l01377"></a>01377 <span class="comment">/*------------------------------------------------------------------------*/</span>
<a name="l01378"></a><a class="code" href="structwcsprm.html#70cac2976524a5f0a6aeb2b3fcb95834">01378</a> <span class="keywordtype">int</span> <a class="code" href="structwcsprm.html#70cac2976524a5f0a6aeb2b3fcb95834">naxis</a>; <span class="comment">/* Number of axes (pixel and coordinate). */</span>
<a name="l01379"></a><a class="code" href="structwcsprm.html#adad828f07e3affd1511e533b00da19f">01379</a> <span class="keywordtype">double</span> *<a class="code" href="structwcsprm.html#adad828f07e3affd1511e533b00da19f">crpix</a>; <span class="comment">/* CRPIXja keyvalues for each pixel axis. */</span>
<a name="l01380"></a><a class="code" href="structwcsprm.html#3495a5b0ef529706ec9a0af5c3163d63">01380</a> <span class="keywordtype">double</span> *<a class="code" href="structwcsprm.html#3495a5b0ef529706ec9a0af5c3163d63">pc</a>; <span class="comment">/* PCi_ja linear transformation matrix. */</span>
<a name="l01381"></a><a class="code" href="structwcsprm.html#de355cdce054938cfa36e06ef9c51446">01381</a> <span class="keywordtype">double</span> *<a class="code" href="structwcsprm.html#de355cdce054938cfa36e06ef9c51446">cdelt</a>; <span class="comment">/* CDELTia keyvalues for each coord axis. */</span>
<a name="l01382"></a><a class="code" href="structwcsprm.html#7a0a1ce2432cef9377f70367ea1fd18c">01382</a> <span class="keywordtype">double</span> *<a class="code" href="structwcsprm.html#7a0a1ce2432cef9377f70367ea1fd18c">crval</a>; <span class="comment">/* CRVALia keyvalues for each coord axis. */</span>
<a name="l01383"></a>01383
<a name="l01384"></a><a class="code" href="structwcsprm.html#a0ae3f3605566be2e85e51e5b52c3b52">01384</a> char (*<a class="code" href="structwcsprm.html#a0ae3f3605566be2e85e51e5b52c3b52">cunit</a>)[72]; <span class="comment">/* CUNITia keyvalues for each coord axis. */</span>
<a name="l01385"></a><a class="code" href="structwcsprm.html#e1f462606974e1324cd38f143eda691e">01385</a> char (*<a class="code" href="structwcsprm.html#e1f462606974e1324cd38f143eda691e">ctype</a>)[72]; <span class="comment">/* CTYPEia keyvalues for each coord axis. */</span>
<a name="l01386"></a>01386
<a name="l01387"></a><a class="code" href="structwcsprm.html#f8f679749574250cb9ba09e1f05fab5d">01387</a> <span class="keywordtype">double</span> <a class="code" href="structwcsprm.html#f8f679749574250cb9ba09e1f05fab5d">lonpole</a>; <span class="comment">/* LONPOLEa keyvalue. */</span>
<a name="l01388"></a><a class="code" href="structwcsprm.html#5e04127eb71da6e1350467a7a6d236f5">01388</a> <span class="keywordtype">double</span> <a class="code" href="structwcsprm.html#5e04127eb71da6e1350467a7a6d236f5">latpole</a>; <span class="comment">/* LATPOLEa keyvalue. */</span>
<a name="l01389"></a>01389
<a name="l01390"></a><a class="code" href="structwcsprm.html#da1b98589c0127d34766b4c6b5d6cb41">01390</a> <span class="keywordtype">double</span> <a class="code" href="structwcsprm.html#da1b98589c0127d34766b4c6b5d6cb41">restfrq</a>; <span class="comment">/* RESTFRQa keyvalue. */</span>
<a name="l01391"></a><a class="code" href="structwcsprm.html#5d0b60efc55a61525b9beb26ead4859e">01391</a> <span class="keywordtype">double</span> <a class="code" href="structwcsprm.html#5d0b60efc55a61525b9beb26ead4859e">restwav</a>; <span class="comment">/* RESTWAVa keyvalue. */</span>
<a name="l01392"></a>01392
<a name="l01393"></a><a class="code" href="structwcsprm.html#0e31f1eef036258c2957da9b985945dd">01393</a> <span class="keywordtype">int</span> <a class="code" href="structwcsprm.html#0e31f1eef036258c2957da9b985945dd">npv</a>; <span class="comment">/* Number of PVi_ma keywords, and the */</span>
<a name="l01394"></a><a class="code" href="structwcsprm.html#912eed291f15134e8cfb8750acc6c4bc">01394</a> <span class="keywordtype">int</span> <a class="code" href="structwcsprm.html#912eed291f15134e8cfb8750acc6c4bc">npvmax</a>; <span class="comment">/* number for which space was allocated. */</span>
<a name="l01395"></a><a class="code" href="structwcsprm.html#04fbd6ed1b338e225f2291523e64be2c">01395</a> <span class="keyword">struct </span><a class="code" href="structpvcard.html" title="Store for PVi_ma keyrecords.">pvcard</a> *<a class="code" href="structwcsprm.html#04fbd6ed1b338e225f2291523e64be2c">pv</a>; <span class="comment">/* PVi_ma keywords for each i and m. */</span>
<a name="l01396"></a>01396
<a name="l01397"></a><a class="code" href="structwcsprm.html#4c89dafecd036e169f96cb84d53ace65">01397</a> <span class="keywordtype">int</span> <a class="code" href="structwcsprm.html#4c89dafecd036e169f96cb84d53ace65">nps</a>; <span class="comment">/* Number of PSi_ma keywords, and the */</span>
<a name="l01398"></a><a class="code" href="structwcsprm.html#42052d557bdef2c5640a6d19b6d9ed8b">01398</a> <span class="keywordtype">int</span> <a class="code" href="structwcsprm.html#42052d557bdef2c5640a6d19b6d9ed8b">npsmax</a>; <span class="comment">/* number for which space was allocated. */</span>
<a name="l01399"></a><a class="code" href="structwcsprm.html#9eca2fcc30058310d020181ae16bf256">01399</a> <span class="keyword">struct </span><a class="code" href="structpscard.html" title="Store for PSi_ma keyrecords.">pscard</a> *<a class="code" href="structwcsprm.html#9eca2fcc30058310d020181ae16bf256">ps</a>; <span class="comment">/* PSi_ma keywords for each i and m. */</span>
<a name="l01400"></a>01400
<a name="l01401"></a>01401 <span class="comment">/* Alternative header keyvalues (see the prologue above). */</span>
<a name="l01402"></a>01402 <span class="comment">/*------------------------------------------------------------------------*/</span>
<a name="l01403"></a><a class="code" href="structwcsprm.html#fd2f31d782b3becce4ca2f9b495ec0b1">01403</a> <span class="keywordtype">double</span> *<a class="code" href="structwcsprm.html#fd2f31d782b3becce4ca2f9b495ec0b1">cd</a>; <span class="comment">/* CDi_ja linear transformation matrix. */</span>
<a name="l01404"></a><a class="code" href="structwcsprm.html#f124a4259475ea355ced38e73a05363a">01404</a> <span class="keywordtype">double</span> *<a class="code" href="structwcsprm.html#f124a4259475ea355ced38e73a05363a">crota</a>; <span class="comment">/* CROTAia keyvalues for each coord axis. */</span>
<a name="l01405"></a><a class="code" href="structwcsprm.html#8b3a65921acc0dabfa4efd19a003ea6e">01405</a> <span class="keywordtype">int</span> <a class="code" href="structwcsprm.html#8b3a65921acc0dabfa4efd19a003ea6e">altlin</a>; <span class="comment">/* Alternative representations */</span>
<a name="l01406"></a>01406 <span class="comment">/* Bit 0: PCi_ja is present, */</span>
<a name="l01407"></a>01407 <span class="comment">/* Bit 1: CDi_ja is present, */</span>
<a name="l01408"></a>01408 <span class="comment">/* Bit 2: CROTAia is present. */</span>
<a name="l01409"></a><a class="code" href="structwcsprm.html#c3c9c869bef4e4850dfd9762b33ce908">01409</a> <span class="keywordtype">int</span> <a class="code" href="structwcsprm.html#c3c9c869bef4e4850dfd9762b33ce908">velref</a>; <span class="comment">/* AIPS velocity code, VELREF. */</span>
<a name="l01410"></a>01410
<a name="l01411"></a>01411 <span class="comment">/* Auxiliary coordinate system information, not used by WCSLIB. */</span>
<a name="l01412"></a><a class="code" href="structwcsprm.html#e7609283351ea46484690f873f8ea9c3">01412</a> <span class="keywordtype">char</span> <a class="code" href="structwcsprm.html#e7609283351ea46484690f873f8ea9c3">alt</a>[4];
<a name="l01413"></a><a class="code" href="structwcsprm.html#9ee8fb568ca75874bab00825b768f8ca">01413</a> <span class="keywordtype">int</span> <a class="code" href="structwcsprm.html#9ee8fb568ca75874bab00825b768f8ca">colnum</a>;
<a name="l01414"></a><a class="code" href="structwcsprm.html#7320fc64e7705cc7495eba07482b5c55">01414</a> <span class="keywordtype">int</span> *<a class="code" href="structwcsprm.html#7320fc64e7705cc7495eba07482b5c55">colax</a>;
<a name="l01415"></a>01415
<a name="l01416"></a><a class="code" href="structwcsprm.html#922f0f57b8c35cad3d01ceedeba01d4b">01416</a> char (*<a class="code" href="structwcsprm.html#922f0f57b8c35cad3d01ceedeba01d4b">cname</a>)[72];
<a name="l01417"></a><a class="code" href="structwcsprm.html#49eee6450b1a646d3fe01b8965a63af4">01417</a> <span class="keywordtype">double</span> *<a class="code" href="structwcsprm.html#49eee6450b1a646d3fe01b8965a63af4">crder</a>;
<a name="l01418"></a><a class="code" href="structwcsprm.html#15485177ea8bbacefc29a5a5cba98c8f">01418</a> <span class="keywordtype">double</span> *<a class="code" href="structwcsprm.html#15485177ea8bbacefc29a5a5cba98c8f">csyer</a>;
<a name="l01419"></a><a class="code" href="structwcsprm.html#e6b40e2adeb31414871c7cae68619d63">01419</a> <span class="keywordtype">char</span> <a class="code" href="structwcsprm.html#e6b40e2adeb31414871c7cae68619d63">dateavg</a>[72];
<a name="l01420"></a><a class="code" href="structwcsprm.html#ad387ccbd7847672b5dc2223d9124120">01420</a> <span class="keywordtype">char</span> <a class="code" href="structwcsprm.html#ad387ccbd7847672b5dc2223d9124120">dateobs</a>[72];
<a name="l01421"></a><a class="code" href="structwcsprm.html#88b55f6c8d122f3ff63532de85698864">01421</a> <span class="keywordtype">double</span> <a class="code" href="structwcsprm.html#88b55f6c8d122f3ff63532de85698864">equinox</a>;
<a name="l01422"></a><a class="code" href="structwcsprm.html#0730c37f09502eb364f4e7d7addb8ab8">01422</a> <span class="keywordtype">double</span> <a class="code" href="structwcsprm.html#0730c37f09502eb364f4e7d7addb8ab8">mjdavg</a>;
<a name="l01423"></a><a class="code" href="structwcsprm.html#c0cb013b1505fb7abd4167ac0db0e0aa">01423</a> <span class="keywordtype">double</span> <a class="code" href="structwcsprm.html#c0cb013b1505fb7abd4167ac0db0e0aa">mjdobs</a>;
<a name="l01424"></a><a class="code" href="structwcsprm.html#6a88e64207df5007151c2c25028ce3eb">01424</a> <span class="keywordtype">double</span> <a class="code" href="structwcsprm.html#6a88e64207df5007151c2c25028ce3eb">obsgeo</a>[3];
<a name="l01425"></a><a class="code" href="structwcsprm.html#65801f93622504672ee3faf8f2110e48">01425</a> <span class="keywordtype">char</span> <a class="code" href="structwcsprm.html#65801f93622504672ee3faf8f2110e48">radesys</a>[72];
<a name="l01426"></a><a class="code" href="structwcsprm.html#c089e5d0e3191255ceaea7f8591b27ea">01426</a> <span class="keywordtype">char</span> <a class="code" href="structwcsprm.html#c089e5d0e3191255ceaea7f8591b27ea">specsys</a>[72];
<a name="l01427"></a><a class="code" href="structwcsprm.html#9eac54f497e1244c8106dd3ebba12223">01427</a> <span class="keywordtype">char</span> <a class="code" href="structwcsprm.html#9eac54f497e1244c8106dd3ebba12223">ssysobs</a>[72];
<a name="l01428"></a><a class="code" href="structwcsprm.html#f300da5a94594a9769ab312bb56dde83">01428</a> <span class="keywordtype">double</span> <a class="code" href="structwcsprm.html#f300da5a94594a9769ab312bb56dde83">velosys</a>;
<a name="l01429"></a><a class="code" href="structwcsprm.html#0936d10c2ac93d13d096b1711ac639a1">01429</a> <span class="keywordtype">double</span> <a class="code" href="structwcsprm.html#0936d10c2ac93d13d096b1711ac639a1">zsource</a>;
<a name="l01430"></a><a class="code" href="structwcsprm.html#8715975565c8bbd0c562a32eee40fd20">01430</a> <span class="keywordtype">char</span> <a class="code" href="structwcsprm.html#8715975565c8bbd0c562a32eee40fd20">ssyssrc</a>[72];
<a name="l01431"></a><a class="code" href="structwcsprm.html#9fd60ce9e6bc31df07ed02ce64b48be4">01431</a> <span class="keywordtype">double</span> <a class="code" href="structwcsprm.html#9fd60ce9e6bc31df07ed02ce64b48be4">velangl</a>;
<a name="l01432"></a><a class="code" href="structwcsprm.html#2166fb650f937d8870711d8be5986b66">01432</a> <span class="keywordtype">char</span> <a class="code" href="structwcsprm.html#2166fb650f937d8870711d8be5986b66">wcsname</a>[72];
<a name="l01433"></a>01433
<a name="l01434"></a>01434 <span class="comment">/* Coordinate lookup tables (see the prologue above). */</span>
<a name="l01435"></a>01435 <span class="comment">/*------------------------------------------------------------------------*/</span>
<a name="l01436"></a><a class="code" href="structwcsprm.html#94c26ce331cc876d63baeeada9820241">01436</a> <span class="keywordtype">int</span> <a class="code" href="structwcsprm.html#94c26ce331cc876d63baeeada9820241">ntab</a>; <span class="comment">/* Number of separate tables. */</span>
<a name="l01437"></a><a class="code" href="structwcsprm.html#8625c0a6ff99c754566c46c2372df801">01437</a> <span class="keywordtype">int</span> <a class="code" href="structwcsprm.html#8625c0a6ff99c754566c46c2372df801">nwtb</a>; <span class="comment">/* Number of wtbarr structs. */</span>
<a name="l01438"></a><a class="code" href="structwcsprm.html#292133b2b7143b969a3af6a3f2cf3709">01438</a> <span class="keyword">struct </span><a class="code" href="structtabprm.html" title="Tabular transformation parameters.">tabprm</a> *<a class="code" href="structwcsprm.html#292133b2b7143b969a3af6a3f2cf3709">tab</a>; <span class="comment">/* Tabular transformation parameters. */</span>
<a name="l01439"></a><a class="code" href="structwcsprm.html#9063e8d0c956e9eae7f7d6f3608b9ed2">01439</a> <span class="keyword">struct </span><a class="code" href="structwtbarr.html" title="Extraction of coordinate lookup tables from BINTABLE.">wtbarr</a> *<a class="code" href="structwcsprm.html#9063e8d0c956e9eae7f7d6f3608b9ed2">wtb</a>; <span class="comment">/* Array of wtbarr structs. */</span>
<a name="l01440"></a>01440
<a name="l01441"></a>01441 <span class="comment">/* Information derived from the FITS header keyvalues by wcsset(). */</span>
<a name="l01442"></a>01442 <span class="comment">/*------------------------------------------------------------------------*/</span>
<a name="l01443"></a><a class="code" href="structwcsprm.html#5b56e1b378a6ae9f8dfff5c364f0653c">01443</a> <span class="keywordtype">char</span> <a class="code" href="structwcsprm.html#5b56e1b378a6ae9f8dfff5c364f0653c">lngtyp</a>[8], <a class="code" href="structwcsprm.html#e352318ce3202dab1b5db8b9ceec7703">lattyp</a>[8]; <span class="comment">/* Celestial axis types, e.g. RA, DEC. */</span>
<a name="l01444"></a><a class="code" href="structwcsprm.html#b9729795155b8f37afd80784fb70068b">01444</a> <span class="keywordtype">int</span> <a class="code" href="structwcsprm.html#08098820949433d1336841d32d0b62b5">lng</a>, <a class="code" href="structwcsprm.html#b7f7173e6d2b1b8028a3275bdd751e79">lat</a>, <a class="code" href="structwcsprm.html#b9729795155b8f37afd80784fb70068b">spec</a>; <span class="comment">/* Longitude, latitude and spectral axis */</span>
<a name="l01445"></a>01445 <span class="comment">/* indices (0-relative). */</span>
<a name="l01446"></a><a class="code" href="structwcsprm.html#de8495d3ca5047eeadba5934d0bb2708">01446</a> <span class="keywordtype">int</span> <a class="code" href="structwcsprm.html#de8495d3ca5047eeadba5934d0bb2708">cubeface</a>; <span class="comment">/* True if there is a CUBEFACE axis. */</span>
<a name="l01447"></a><a class="code" href="structwcsprm.html#b63cdcf6ff8febd1b40d0e044ca7d7ef">01447</a> <span class="keywordtype">int</span> *<a class="code" href="structwcsprm.html#b63cdcf6ff8febd1b40d0e044ca7d7ef">types</a>; <span class="comment">/* Coordinate type codes for each axis. */</span>
<a name="l01448"></a><a class="code" href="structwcsprm.html#b253d36f0dc1716952285c6078622e66">01448</a> <span class="keywordtype">void</span> *<a class="code" href="structwcsprm.html#b253d36f0dc1716952285c6078622e66">padding</a>; <span class="comment">/* (Dummy inserted for alignment purposes.) */</span>
<a name="l01449"></a>01449
<a name="l01450"></a><a class="code" href="structwcsprm.html#3224bd06f8f4d2d7d398533eb44a49e8">01450</a> <span class="keyword">struct </span><a class="code" href="structlinprm.html" title="Linear transformation parameters.">linprm</a> <a class="code" href="structwcsprm.html#3224bd06f8f4d2d7d398533eb44a49e8">lin</a>; <span class="comment">/* Linear transformation parameters. */</span>
<a name="l01451"></a><a class="code" href="structwcsprm.html#c8391dd770637dbb841067996b7777ba">01451</a> <span class="keyword">struct </span><a class="code" href="structcelprm.html" title="Celestial transformation parameters.">celprm</a> <a class="code" href="structwcsprm.html#c8391dd770637dbb841067996b7777ba">cel</a>; <span class="comment">/* Celestial transformation parameters. */</span>
<a name="l01452"></a><a class="code" href="structwcsprm.html#e83952aec7c1ac76c090bc89bf4eeea7">01452</a> <span class="keyword">struct </span><a class="code" href="structspcprm.html" title="Spectral transformation parameters.">spcprm</a> <a class="code" href="structwcsprm.html#e83952aec7c1ac76c090bc89bf4eeea7">spc</a>; <span class="comment">/* Spectral transformation parameters. */</span>
<a name="l01453"></a>01453
<a name="l01454"></a>01454 <span class="comment">/* Error handling */</span>
<a name="l01455"></a>01455 <span class="comment">/*------------------------------------------------------------------------*/</span>
<a name="l01456"></a><a class="code" href="structwcsprm.html#f54ce939604be183231f0ee006e2f8ed">01456</a> <span class="keyword">struct </span><a class="code" href="structwcserr.html" title="Error message handling.">wcserr</a> *<a class="code" href="structwcsprm.html#f54ce939604be183231f0ee006e2f8ed">err</a>;
<a name="l01457"></a>01457
<a name="l01458"></a>01458 <span class="comment">/* Private - the remainder are for memory management. */</span>
<a name="l01459"></a>01459 <span class="comment">/*------------------------------------------------------------------------*/</span>
<a name="l01460"></a><a class="code" href="structwcsprm.html#603ef3ab7f3bc42cf8d8bf99b79b63ac">01460</a> <span class="keywordtype">void</span> *<a class="code" href="structwcsprm.html#603ef3ab7f3bc42cf8d8bf99b79b63ac">m_padding</a>;
<a name="l01461"></a><a class="code" href="structwcsprm.html#5ed753e401cda620a04adfb4ebfb8e0d">01461</a> <span class="keywordtype">int</span> <a class="code" href="structwcsprm.html#5780880281f2f9d085d2e06919b7647a">m_flag</a>, <a class="code" href="structwcsprm.html#5ed753e401cda620a04adfb4ebfb8e0d">m_naxis</a>;
<a name="l01462"></a><a class="code" href="structwcsprm.html#6778d31ec5a2ee643dc5f0a8af630b03">01462</a> <span class="keywordtype">double</span> *<a class="code" href="structwcsprm.html#164e3852bcd2dea8b5f73e1dff79ddf5">m_crpix</a>, *<a class="code" href="structwcsprm.html#6778d31ec5a2ee643dc5f0a8af630b03">m_pc</a>, *<a class="code" href="structwcsprm.html#42e0ff2da3b0c1ca0a9509f787ed1951">m_cdelt</a>, *<a class="code" href="structwcsprm.html#5072893bd9beddb33967697d501acdce">m_crval</a>;
<a name="l01463"></a><a class="code" href="structwcsprm.html#f1cb3e68560d1ac42c620cfe3900af95">01463</a> char (*<a class="code" href="structwcsprm.html#f1cb3e68560d1ac42c620cfe3900af95">m_cunit</a>)[72], (*m_ctype)[72];
<a name="l01464"></a><a class="code" href="structwcsprm.html#6a3fa7adc304567271c5cc0eda3ac986">01464</a> <span class="keyword">struct </span><a class="code" href="structpvcard.html" title="Store for PVi_ma keyrecords.">pvcard</a> *<a class="code" href="structwcsprm.html#6a3fa7adc304567271c5cc0eda3ac986">m_pv</a>;
<a name="l01465"></a><a class="code" href="structwcsprm.html#042875def8cab8354c5b2c40ab9fa374">01465</a> <span class="keyword">struct </span><a class="code" href="structpscard.html" title="Store for PSi_ma keyrecords.">pscard</a> *<a class="code" href="structwcsprm.html#042875def8cab8354c5b2c40ab9fa374">m_ps</a>;
<a name="l01466"></a><a class="code" href="structwcsprm.html#5444415c94c7ab0226788f5efe93221d">01466</a> <span class="keywordtype">double</span> *<a class="code" href="structwcsprm.html#7a88af56c4c978c6d4213ae1f4bec87a">m_cd</a>, *<a class="code" href="structwcsprm.html#5444415c94c7ab0226788f5efe93221d">m_crota</a>;
<a name="l01467"></a><a class="code" href="structwcsprm.html#4ed527b90d49e8365c1b727f7bec29c7">01467</a> <span class="keywordtype">int</span> *<a class="code" href="structwcsprm.html#4ed527b90d49e8365c1b727f7bec29c7">m_colax</a>;
<a name="l01468"></a><a class="code" href="structwcsprm.html#092c11d209ecdd16bb79858c68e4d582">01468</a> char (*<a class="code" href="structwcsprm.html#092c11d209ecdd16bb79858c68e4d582">m_cname</a>)[72];
<a name="l01469"></a><a class="code" href="structwcsprm.html#13fab263ca03f35844fdaca289b7dfac">01469</a> <span class="keywordtype">double</span> *<a class="code" href="structwcsprm.html#0d15534535c7f9308c9daa2cceff29e7">m_crder</a>, *<a class="code" href="structwcsprm.html#13fab263ca03f35844fdaca289b7dfac">m_csyer</a>;
<a name="l01470"></a><a class="code" href="structwcsprm.html#e09d5bf005e3bd7ee880353e8816ceb8">01470</a> <span class="keyword">struct </span><a class="code" href="structtabprm.html" title="Tabular transformation parameters.">tabprm</a> *<a class="code" href="structwcsprm.html#e09d5bf005e3bd7ee880353e8816ceb8">m_tab</a>;
<a name="l01471"></a><a class="code" href="structwcsprm.html#ce7e0986c79d73bd3a0613034b71974f">01471</a> <span class="keyword">struct </span><a class="code" href="structwtbarr.html" title="Extraction of coordinate lookup tables from BINTABLE.">wtbarr</a> *<a class="code" href="structwcsprm.html#ce7e0986c79d73bd3a0613034b71974f">m_wtb</a>;
<a name="l01472"></a>01472 };
<a name="l01473"></a>01473
<a name="l01474"></a>01474 <span class="comment">/* Size of the wcsprm struct in int units, used by the Fortran wrappers. */</span>
<a name="l01475"></a><a class="code" href="wcs_8h.html#6852f6dd2883c82296f1108b897d337e">01475</a> <span class="preprocessor">#define WCSLEN (sizeof(struct wcsprm)/sizeof(int))</span>
<a name="l01476"></a>01476 <span class="preprocessor"></span>
<a name="l01477"></a>01477
<a name="l01478"></a>01478 <span class="keywordtype">int</span> <a class="code" href="wcs_8h.html#42b2578d76ace7ca6114d82b7ae46a89" title="Memory allocation for PVi_ma.">wcsnpv</a>(<span class="keywordtype">int</span> n);
<a name="l01479"></a>01479
<a name="l01480"></a>01480 <span class="keywordtype">int</span> <a class="code" href="wcs_8h.html#e790c9ce6c9b7a4845cf1c3c97b1e97a" title="Memory allocation for PSi_ma.">wcsnps</a>(<span class="keywordtype">int</span> n);
<a name="l01481"></a>01481
<a name="l01482"></a>01482 <span class="keywordtype">int</span> <a class="code" href="wcs_8h.html#2afc8255fde0965dddaa374463666d45" title="Default constructor for the wcsprm struct.">wcsini</a>(<span class="keywordtype">int</span> alloc, <span class="keywordtype">int</span> naxis, <span class="keyword">struct</span> <a class="code" href="structwcsprm.html" title="Coordinate transformation parameters.">wcsprm</a> *wcs);
<a name="l01483"></a>01483
<a name="l01484"></a>01484 <span class="keywordtype">int</span> <a class="code" href="wcs_8h.html#864c99fef9f3eee29085ce42d0ee0d64" title="Subimage extraction routine for the wcsprm struct.">wcssub</a>(<span class="keywordtype">int</span> alloc, <span class="keyword">const</span> <span class="keyword">struct</span> <a class="code" href="structwcsprm.html" title="Coordinate transformation parameters.">wcsprm</a> *wcssrc, <span class="keywordtype">int</span> *nsub, <span class="keywordtype">int</span> axes[],
<a name="l01485"></a>01485 <span class="keyword">struct</span> <a class="code" href="structwcsprm.html" title="Coordinate transformation parameters.">wcsprm</a> *wcsdst);
<a name="l01486"></a>01486
<a name="l01487"></a>01487 <span class="keywordtype">int</span> <a class="code" href="wcs_8h.html#4ab38bc642c4656f62c43acf84a849f1" title="Destructor for the wcsprm struct.">wcsfree</a>(<span class="keyword">struct</span> <a class="code" href="structwcsprm.html" title="Coordinate transformation parameters.">wcsprm</a> *wcs);
<a name="l01488"></a>01488
<a name="l01489"></a>01489 <span class="keywordtype">int</span> <a class="code" href="wcs_8h.html#b9aeb8cf1afb1bfb22e989580d90fca8" title="Print routine for the wcsprm struct.">wcsprt</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code" href="structwcsprm.html" title="Coordinate transformation parameters.">wcsprm</a> *wcs);
<a name="l01490"></a>01490
<a name="l01491"></a>01491 <span class="keywordtype">int</span> <a class="code" href="wcs_8h.html#8fe5dcd9927240dc0348b850ee662367" title="Print error messages from a wcsprm struct.">wcsperr</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code" href="structwcsprm.html" title="Coordinate transformation parameters.">wcsprm</a> *wcs, <span class="keyword">const</span> <span class="keywordtype">char</span> *prefix);
<a name="l01492"></a>01492
<a name="l01493"></a>01493 <span class="keywordtype">int</span> <a class="code" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset</a>(<span class="keyword">struct</span> <a class="code" href="structwcsprm.html" title="Coordinate transformation parameters.">wcsprm</a> *wcs);
<a name="l01494"></a>01494
<a name="l01495"></a>01495 <span class="keywordtype">int</span> <a class="code" href="wcs_8h.html#27d3dd209db3e76cf4c50f48c01ba986" title="Pixel-to-world transformation.">wcsp2s</a>(<span class="keyword">struct</span> <a class="code" href="structwcsprm.html" title="Coordinate transformation parameters.">wcsprm</a> *wcs, <span class="keywordtype">int</span> ncoord, <span class="keywordtype">int</span> nelem, <span class="keyword">const</span> <span class="keywordtype">double</span> pixcrd[],
<a name="l01496"></a>01496 <span class="keywordtype">double</span> imgcrd[], <span class="keywordtype">double</span> phi[], <span class="keywordtype">double</span> theta[], <span class="keywordtype">double</span> world[],
<a name="l01497"></a>01497 <span class="keywordtype">int</span> stat[]);
<a name="l01498"></a>01498
<a name="l01499"></a>01499 <span class="keywordtype">int</span> <a class="code" href="wcs_8h.html#60673d05a3513659ac848a9cb3d0cb07" title="World-to-pixel transformation.">wcss2p</a>(<span class="keyword">struct</span> <a class="code" href="structwcsprm.html" title="Coordinate transformation parameters.">wcsprm</a> *wcs, <span class="keywordtype">int</span> ncoord, <span class="keywordtype">int</span> nelem, <span class="keyword">const</span> <span class="keywordtype">double</span> world[],
<a name="l01500"></a>01500 <span class="keywordtype">double</span> phi[], <span class="keywordtype">double</span> theta[], <span class="keywordtype">double</span> imgcrd[], <span class="keywordtype">double</span> pixcrd[],
<a name="l01501"></a>01501 <span class="keywordtype">int</span> stat[]);
<a name="l01502"></a>01502
<a name="l01503"></a>01503 <span class="keywordtype">int</span> <a class="code" href="wcs_8h.html#f3f00b876c8212d43f32a51feeadaa81" title="Hybrid coordinate transformation.">wcsmix</a>(<span class="keyword">struct</span> <a class="code" href="structwcsprm.html" title="Coordinate transformation parameters.">wcsprm</a> *wcs, <span class="keywordtype">int</span> mixpix, <span class="keywordtype">int</span> mixcel, <span class="keyword">const</span> <span class="keywordtype">double</span> vspan[],
<a name="l01504"></a>01504 <span class="keywordtype">double</span> vstep, <span class="keywordtype">int</span> viter, <span class="keywordtype">double</span> world[], <span class="keywordtype">double</span> phi[],
<a name="l01505"></a>01505 <span class="keywordtype">double</span> theta[], <span class="keywordtype">double</span> imgcrd[], <span class="keywordtype">double</span> pixcrd[]);
<a name="l01506"></a>01506
<a name="l01507"></a>01507 <span class="keywordtype">int</span> <a class="code" href="wcs_8h.html#57975833fe0588eb7c7b6d79f13a7693" title="Spectral axis translation.">wcssptr</a>(<span class="keyword">struct</span> <a class="code" href="structwcsprm.html" title="Coordinate transformation parameters.">wcsprm</a> *wcs, <span class="keywordtype">int</span> *<a class="code" href="structwtbarr.html#8743b84c99b4b5e7ab7bf0653507a180">i</a>, <span class="keywordtype">char</span> ctype[9]);
<a name="l01508"></a>01508
<a name="l01509"></a>01509 <span class="comment">/* Defined mainly for backwards compatibility, use wcssub() instead. */</span>
<a name="l01510"></a><a class="code" href="wcs_8h.html#c55946dadc53ac592cb686275902ae7b">01510</a> <span class="preprocessor">#define wcscopy(alloc, wcssrc, wcsdst) wcssub(alloc, wcssrc, 0, 0, wcsdst)</span>
<a name="l01511"></a>01511 <span class="preprocessor"></span>
<a name="l01512"></a>01512
<a name="l01513"></a>01513 <span class="comment">/* Deprecated. */</span>
<a name="l01514"></a><a class="code" href="wcs_8h.html#1bcf49cfe1ed1bb2bc4c930f98d808fa">01514</a> <span class="preprocessor">#define wcsini_errmsg wcs_errmsg</span>
<a name="l01515"></a><a class="code" href="wcs_8h.html#465ef3c77aaf546324dae0692e6de7fe">01515</a> <span class="preprocessor"></span><span class="preprocessor">#define wcssub_errmsg wcs_errmsg</span>
<a name="l01516"></a><a class="code" href="wcs_8h.html#e1738854472218541bda531653ef2709">01516</a> <span class="preprocessor"></span><span class="preprocessor">#define wcscopy_errmsg wcs_errmsg</span>
<a name="l01517"></a><a class="code" href="wcs_8h.html#3d64b57cec404114c75bd25a562e8053">01517</a> <span class="preprocessor"></span><span class="preprocessor">#define wcsfree_errmsg wcs_errmsg</span>
<a name="l01518"></a><a class="code" href="wcs_8h.html#8f5c31a6983b17abbe2fead61550d55c">01518</a> <span class="preprocessor"></span><span class="preprocessor">#define wcsprt_errmsg wcs_errmsg</span>
<a name="l01519"></a><a class="code" href="wcs_8h.html#84a67c964e212bbf004c264b3ca70fee">01519</a> <span class="preprocessor"></span><span class="preprocessor">#define wcsset_errmsg wcs_errmsg</span>
<a name="l01520"></a><a class="code" href="wcs_8h.html#de3959355dc9d0987e7ccc4070795c38">01520</a> <span class="preprocessor"></span><span class="preprocessor">#define wcsp2s_errmsg wcs_errmsg</span>
<a name="l01521"></a><a class="code" href="wcs_8h.html#37c4884cf58baf25b2984ec3bccb80a5">01521</a> <span class="preprocessor"></span><span class="preprocessor">#define wcss2p_errmsg wcs_errmsg</span>
<a name="l01522"></a><a class="code" href="wcs_8h.html#cfbadc770489b6b5186b95eaa35467f1">01522</a> <span class="preprocessor"></span><span class="preprocessor">#define wcsmix_errmsg wcs_errmsg</span>
<a name="l01523"></a>01523 <span class="preprocessor"></span>
<a name="l01524"></a>01524 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l01525"></a>01525 <span class="preprocessor"></span><span class="preprocessor">#undef wtbarr</span>
<a name="l01526"></a>01526 <span class="preprocessor"></span>}
<a name="l01527"></a>01527 <span class="preprocessor">#endif</span>
<a name="l01528"></a>01528 <span class="preprocessor"></span>
<a name="l01529"></a>01529 <span class="preprocessor">#endif </span><span class="comment">/* WCSLIB_WCS */</span>
</pre></div></div>
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