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<h1>cel.h</h1><a href="cel_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: cel.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">* Refer to the README file provided with WCSLIB for an overview of the</span>
<a name="l00044"></a>00044 <span class="comment">* library.</span>
<a name="l00045"></a>00045 <span class="comment">*</span>
<a name="l00046"></a>00046 <span class="comment">*</span>
<a name="l00047"></a>00047 <span class="comment">* Summary of the cel routines</span>
<a name="l00048"></a>00048 <span class="comment">* ---------------------------</span>
<a name="l00049"></a>00049 <span class="comment">* These routines implement the part of the FITS World Coordinate System (WCS)</span>
<a name="l00050"></a>00050 <span class="comment">* standard that deals with celestial coordinates. They define methods to be</span>
<a name="l00051"></a>00051 <span class="comment">* used for computing celestial world coordinates from intermediate world</span>
<a name="l00052"></a>00052 <span class="comment">* coordinates (a linear transformation of image pixel coordinates), and vice</span>
<a name="l00053"></a>00053 <span class="comment">* versa. They are based on the celprm struct which contains all information</span>
<a name="l00054"></a>00054 <span class="comment">* needed for the computations. This struct contains some elements that must</span>
<a name="l00055"></a>00055 <span class="comment">* be set by the user, and others that are maintained by these routines,</span>
<a name="l00056"></a>00056 <span class="comment">* somewhat like a C++ class but with no encapsulation.</span>
<a name="l00057"></a>00057 <span class="comment">*</span>
<a name="l00058"></a>00058 <span class="comment">* Routine celini() is provided to initialize the celprm struct with default</span>
<a name="l00059"></a>00059 <span class="comment">* values, celfree() reclaims any memory that may have been allocated to store</span>
<a name="l00060"></a>00060 <span class="comment">* an error message, and celprt() prints its contents.</span>
<a name="l00061"></a>00061 <span class="comment">*</span>
<a name="l00062"></a>00062 <span class="comment">* A setup routine, celset(), computes intermediate values in the celprm struct</span>
<a name="l00063"></a>00063 <span class="comment">* from parameters in it that were supplied by the user. The struct always</span>
<a name="l00064"></a>00064 <span class="comment">* needs to be set up by celset() but it need not be called explicitly - refer</span>
<a name="l00065"></a>00065 <span class="comment">* to the explanation of celprm::flag.</span>
<a name="l00066"></a>00066 <span class="comment">*</span>
<a name="l00067"></a>00067 <span class="comment">* celx2s() and cels2x() implement the WCS celestial coordinate</span>
<a name="l00068"></a>00068 <span class="comment">* transformations. In fact, they are high level driver routines for the lower</span>
<a name="l00069"></a>00069 <span class="comment">* level spherical coordinate rotation and projection routines described in</span>
<a name="l00070"></a>00070 <span class="comment">* sph.h and prj.h.</span>
<a name="l00071"></a>00071 <span class="comment">*</span>
<a name="l00072"></a>00072 <span class="comment">*</span>
<a name="l00073"></a>00073 <span class="comment">* celini() - Default constructor for the celprm struct</span>
<a name="l00074"></a>00074 <span class="comment">* ----------------------------------------------------</span>
<a name="l00075"></a>00075 <span class="comment">* celini() sets all members of a celprm struct to default values. It should</span>
<a name="l00076"></a>00076 <span class="comment">* be used to initialize every celprm struct.</span>
<a name="l00077"></a>00077 <span class="comment">*</span>
<a name="l00078"></a>00078 <span class="comment">* Returned:</span>
<a name="l00079"></a>00079 <span class="comment">* cel struct celprm*</span>
<a name="l00080"></a>00080 <span class="comment">* Celestial transformation parameters.</span>
<a name="l00081"></a>00081 <span class="comment">*</span>
<a name="l00082"></a>00082 <span class="comment">* Function return value:</span>
<a name="l00083"></a>00083 <span class="comment">* int Status return value:</span>
<a name="l00084"></a>00084 <span class="comment">* 0: Success.</span>
<a name="l00085"></a>00085 <span class="comment">* 1: Null celprm pointer passed.</span>
<a name="l00086"></a>00086 <span class="comment">*</span>
<a name="l00087"></a>00087 <span class="comment">*</span>
<a name="l00088"></a>00088 <span class="comment">* celfree() - Destructor for the celprm struct</span>
<a name="l00089"></a>00089 <span class="comment">* --------------------------------------------</span>
<a name="l00090"></a>00090 <span class="comment">* celfree() frees any memory that may have been allocated to store an error</span>
<a name="l00091"></a>00091 <span class="comment">* message in the celprm struct.</span>
<a name="l00092"></a>00092 <span class="comment">*</span>
<a name="l00093"></a>00093 <span class="comment">* Given:</span>
<a name="l00094"></a>00094 <span class="comment">* cel struct celprm*</span>
<a name="l00095"></a>00095 <span class="comment">* Celestial transformation parameters.</span>
<a name="l00096"></a>00096 <span class="comment">*</span>
<a name="l00097"></a>00097 <span class="comment">* Function return value:</span>
<a name="l00098"></a>00098 <span class="comment">* int Status return value:</span>
<a name="l00099"></a>00099 <span class="comment">* 0: Success.</span>
<a name="l00100"></a>00100 <span class="comment">* 1: Null celprm pointer passed.</span>
<a name="l00101"></a>00101 <span class="comment">*</span>
<a name="l00102"></a>00102 <span class="comment">*</span>
<a name="l00103"></a>00103 <span class="comment">* celprt() - Print routine for the celprm struct</span>
<a name="l00104"></a>00104 <span class="comment">* ----------------------------------------------</span>
<a name="l00105"></a>00105 <span class="comment">* celprt() prints the contents of a celprm struct using wcsprintf(). Mainly</span>
<a name="l00106"></a>00106 <span class="comment">* intended for diagnostic purposes.</span>
<a name="l00107"></a>00107 <span class="comment">*</span>
<a name="l00108"></a>00108 <span class="comment">* Given:</span>
<a name="l00109"></a>00109 <span class="comment">* cel const struct celprm*</span>
<a name="l00110"></a>00110 <span class="comment">* Celestial transformation parameters.</span>
<a name="l00111"></a>00111 <span class="comment">*</span>
<a name="l00112"></a>00112 <span class="comment">* Function return value:</span>
<a name="l00113"></a>00113 <span class="comment">* int Status return value:</span>
<a name="l00114"></a>00114 <span class="comment">* 0: Success.</span>
<a name="l00115"></a>00115 <span class="comment">* 1: Null celprm pointer passed.</span>
<a name="l00116"></a>00116 <span class="comment">*</span>
<a name="l00117"></a>00117 <span class="comment">*</span>
<a name="l00118"></a>00118 <span class="comment">* celset() - Setup routine for the celprm struct</span>
<a name="l00119"></a>00119 <span class="comment">* ----------------------------------------------</span>
<a name="l00120"></a>00120 <span class="comment">* celset() sets up a celprm struct according to information supplied within</span>
<a name="l00121"></a>00121 <span class="comment">* it.</span>
<a name="l00122"></a>00122 <span class="comment">*</span>
<a name="l00123"></a>00123 <span class="comment">* Note that this routine need not be called directly; it will be invoked by</span>
<a name="l00124"></a>00124 <span class="comment">* celx2s() and cels2x() if celprm::flag is anything other than a predefined</span>
<a name="l00125"></a>00125 <span class="comment">* magic value.</span>
<a name="l00126"></a>00126 <span class="comment">*</span>
<a name="l00127"></a>00127 <span class="comment">* Given and returned:</span>
<a name="l00128"></a>00128 <span class="comment">* cel struct celprm*</span>
<a name="l00129"></a>00129 <span class="comment">* Celestial transformation parameters.</span>
<a name="l00130"></a>00130 <span class="comment">*</span>
<a name="l00131"></a>00131 <span class="comment">* Function return value:</span>
<a name="l00132"></a>00132 <span class="comment">* int Status return value:</span>
<a name="l00133"></a>00133 <span class="comment">* 0: Success.</span>
<a name="l00134"></a>00134 <span class="comment">* 1: Null celprm pointer passed.</span>
<a name="l00135"></a>00135 <span class="comment">* 2: Invalid projection parameters.</span>
<a name="l00136"></a>00136 <span class="comment">* 3: Invalid coordinate transformation parameters.</span>
<a name="l00137"></a>00137 <span class="comment">* 4: Ill-conditioned coordinate transformation</span>
<a name="l00138"></a>00138 <span class="comment">* parameters.</span>
<a name="l00139"></a>00139 <span class="comment">*</span>
<a name="l00140"></a>00140 <span class="comment">* For returns > 1, a detailed error message is set in</span>
<a name="l00141"></a>00141 <span class="comment">* celprm::err if enabled, see wcserr_enable().</span>
<a name="l00142"></a>00142 <span class="comment">*</span>
<a name="l00143"></a>00143 <span class="comment">*</span>
<a name="l00144"></a>00144 <span class="comment">* celx2s() - Pixel-to-world celestial transformation</span>
<a name="l00145"></a>00145 <span class="comment">* --------------------------------------------------</span>
<a name="l00146"></a>00146 <span class="comment">* celx2s() transforms (x,y) coordinates in the plane of projection to</span>
<a name="l00147"></a>00147 <span class="comment">* celestial coordinates (lng,lat).</span>
<a name="l00148"></a>00148 <span class="comment">*</span>
<a name="l00149"></a>00149 <span class="comment">* Given and returned:</span>
<a name="l00150"></a>00150 <span class="comment">* cel struct celprm*</span>
<a name="l00151"></a>00151 <span class="comment">* Celestial transformation parameters.</span>
<a name="l00152"></a>00152 <span class="comment">*</span>
<a name="l00153"></a>00153 <span class="comment">* Given:</span>
<a name="l00154"></a>00154 <span class="comment">* nx,ny int Vector lengths.</span>
<a name="l00155"></a>00155 <span class="comment">*</span>
<a name="l00156"></a>00156 <span class="comment">* sxy,sll int Vector strides.</span>
<a name="l00157"></a>00157 <span class="comment">*</span>
<a name="l00158"></a>00158 <span class="comment">* x,y const double[]</span>
<a name="l00159"></a>00159 <span class="comment">* Projected coordinates in pseudo "degrees".</span>
<a name="l00160"></a>00160 <span class="comment">*</span>
<a name="l00161"></a>00161 <span class="comment">* Returned:</span>
<a name="l00162"></a>00162 <span class="comment">* phi,theta double[] Longitude and latitude (phi,theta) in the native</span>
<a name="l00163"></a>00163 <span class="comment">* coordinate system of the projection [deg].</span>
<a name="l00164"></a>00164 <span class="comment">*</span>
<a name="l00165"></a>00165 <span class="comment">* lng,lat double[] Celestial longitude and latitude (lng,lat) of the</span>
<a name="l00166"></a>00166 <span class="comment">* projected point [deg].</span>
<a name="l00167"></a>00167 <span class="comment">*</span>
<a name="l00168"></a>00168 <span class="comment">* stat int[] Status return value for each vector element:</span>
<a name="l00169"></a>00169 <span class="comment">* 0: Success.</span>
<a name="l00170"></a>00170 <span class="comment">* 1: Invalid value of (x,y).</span>
<a name="l00171"></a>00171 <span class="comment">*</span>
<a name="l00172"></a>00172 <span class="comment">* Function return value:</span>
<a name="l00173"></a>00173 <span class="comment">* int Status return value:</span>
<a name="l00174"></a>00174 <span class="comment">* 0: Success.</span>
<a name="l00175"></a>00175 <span class="comment">* 1: Null celprm pointer passed.</span>
<a name="l00176"></a>00176 <span class="comment">* 2: Invalid projection parameters.</span>
<a name="l00177"></a>00177 <span class="comment">* 3: Invalid coordinate transformation parameters.</span>
<a name="l00178"></a>00178 <span class="comment">* 4: Ill-conditioned coordinate transformation</span>
<a name="l00179"></a>00179 <span class="comment">* parameters.</span>
<a name="l00180"></a>00180 <span class="comment">* 5: One or more of the (x,y) coordinates were</span>
<a name="l00181"></a>00181 <span class="comment">* invalid, as indicated by the stat vector.</span>
<a name="l00182"></a>00182 <span class="comment">*</span>
<a name="l00183"></a>00183 <span class="comment">* For returns > 1, a detailed error message is set in</span>
<a name="l00184"></a>00184 <span class="comment">* celprm::err if enabled, see wcserr_enable().</span>
<a name="l00185"></a>00185 <span class="comment">*</span>
<a name="l00186"></a>00186 <span class="comment">*</span>
<a name="l00187"></a>00187 <span class="comment">* cels2x() - World-to-pixel celestial transformation</span>
<a name="l00188"></a>00188 <span class="comment">* --------------------------------------------------</span>
<a name="l00189"></a>00189 <span class="comment">* cels2x() transforms celestial coordinates (lng,lat) to (x,y) coordinates in</span>
<a name="l00190"></a>00190 <span class="comment">* the plane of projection.</span>
<a name="l00191"></a>00191 <span class="comment">*</span>
<a name="l00192"></a>00192 <span class="comment">* Given and returned:</span>
<a name="l00193"></a>00193 <span class="comment">* cel struct celprm*</span>
<a name="l00194"></a>00194 <span class="comment">* Celestial transformation parameters.</span>
<a name="l00195"></a>00195 <span class="comment">*</span>
<a name="l00196"></a>00196 <span class="comment">* Given:</span>
<a name="l00197"></a>00197 <span class="comment">* nlng,nlat int Vector lengths.</span>
<a name="l00198"></a>00198 <span class="comment">*</span>
<a name="l00199"></a>00199 <span class="comment">* sll,sxy int Vector strides.</span>
<a name="l00200"></a>00200 <span class="comment">*</span>
<a name="l00201"></a>00201 <span class="comment">* lng,lat const double[]</span>
<a name="l00202"></a>00202 <span class="comment">* Celestial longitude and latitude (lng,lat) of the</span>
<a name="l00203"></a>00203 <span class="comment">* projected point [deg].</span>
<a name="l00204"></a>00204 <span class="comment">*</span>
<a name="l00205"></a>00205 <span class="comment">* Returned:</span>
<a name="l00206"></a>00206 <span class="comment">* phi,theta double[] Longitude and latitude (phi,theta) in the native</span>
<a name="l00207"></a>00207 <span class="comment">* coordinate system of the projection [deg].</span>
<a name="l00208"></a>00208 <span class="comment">*</span>
<a name="l00209"></a>00209 <span class="comment">* x,y double[] Projected coordinates in pseudo "degrees".</span>
<a name="l00210"></a>00210 <span class="comment">*</span>
<a name="l00211"></a>00211 <span class="comment">* stat int[] Status return value for each vector element:</span>
<a name="l00212"></a>00212 <span class="comment">* 0: Success.</span>
<a name="l00213"></a>00213 <span class="comment">* 1: Invalid value of (lng,lat).</span>
<a name="l00214"></a>00214 <span class="comment">*</span>
<a name="l00215"></a>00215 <span class="comment">* Function return value:</span>
<a name="l00216"></a>00216 <span class="comment">* int Status return value:</span>
<a name="l00217"></a>00217 <span class="comment">* 0: Success.</span>
<a name="l00218"></a>00218 <span class="comment">* 1: Null celprm pointer passed.</span>
<a name="l00219"></a>00219 <span class="comment">* 2: Invalid projection parameters.</span>
<a name="l00220"></a>00220 <span class="comment">* 3: Invalid coordinate transformation parameters.</span>
<a name="l00221"></a>00221 <span class="comment">* 4: Ill-conditioned coordinate transformation</span>
<a name="l00222"></a>00222 <span class="comment">* parameters.</span>
<a name="l00223"></a>00223 <span class="comment">* 6: One or more of the (lng,lat) coordinates were</span>
<a name="l00224"></a>00224 <span class="comment">* invalid, as indicated by the stat vector.</span>
<a name="l00225"></a>00225 <span class="comment">*</span>
<a name="l00226"></a>00226 <span class="comment">* For returns > 1, a detailed error message is set in</span>
<a name="l00227"></a>00227 <span class="comment">* celprm::err if enabled, see wcserr_enable().</span>
<a name="l00228"></a>00228 <span class="comment">*</span>
<a name="l00229"></a>00229 <span class="comment">*</span>
<a name="l00230"></a>00230 <span class="comment">* celprm struct - Celestial transformation parameters</span>
<a name="l00231"></a>00231 <span class="comment">* ---------------------------------------------------</span>
<a name="l00232"></a>00232 <span class="comment">* The celprm struct contains information required to transform celestial</span>
<a name="l00233"></a>00233 <span class="comment">* coordinates. It consists of certain members that must be set by the user</span>
<a name="l00234"></a>00234 <span class="comment">* ("given") and others that are set by the WCSLIB routines ("returned"). Some</span>
<a name="l00235"></a>00235 <span class="comment">* of the latter are supplied for informational purposes and others are for</span>
<a name="l00236"></a>00236 <span class="comment">* internal use only.</span>
<a name="l00237"></a>00237 <span class="comment">*</span>
<a name="l00238"></a>00238 <span class="comment">* Returned celprm struct members must not be modified by the user.</span>
<a name="l00239"></a>00239 <span class="comment">*</span>
<a name="l00240"></a>00240 <span class="comment">* int flag</span>
<a name="l00241"></a>00241 <span class="comment">* (Given and returned) This flag must be set to zero whenever any of the</span>
<a name="l00242"></a>00242 <span class="comment">* following celprm struct members are set or changed:</span>
<a name="l00243"></a>00243 <span class="comment">*</span>
<a name="l00244"></a>00244 <span class="comment">* - celprm::offset,</span>
<a name="l00245"></a>00245 <span class="comment">* - celprm::phi0,</span>
<a name="l00246"></a>00246 <span class="comment">* - celprm::theta0,</span>
<a name="l00247"></a>00247 <span class="comment">* - celprm::ref[4],</span>
<a name="l00248"></a>00248 <span class="comment">* - celprm::prj:</span>
<a name="l00249"></a>00249 <span class="comment">* - prjprm::code,</span>
<a name="l00250"></a>00250 <span class="comment">* - prjprm::r0,</span>
<a name="l00251"></a>00251 <span class="comment">* - prjprm::pv[],</span>
<a name="l00252"></a>00252 <span class="comment">* - prjprm::phi0,</span>
<a name="l00253"></a>00253 <span class="comment">* - prjprm::theta0.</span>
<a name="l00254"></a>00254 <span class="comment">*</span>
<a name="l00255"></a>00255 <span class="comment">* This signals the initialization routine, celset(), to recompute the</span>
<a name="l00256"></a>00256 <span class="comment">* returned members of the celprm struct. celset() will reset flag to</span>
<a name="l00257"></a>00257 <span class="comment">* indicate that this has been done.</span>
<a name="l00258"></a>00258 <span class="comment">*</span>
<a name="l00259"></a>00259 <span class="comment">* int offset</span>
<a name="l00260"></a>00260 <span class="comment">* (Given) If true (non-zero), an offset will be applied to (x,y) to</span>
<a name="l00261"></a>00261 <span class="comment">* force (x,y) = (0,0) at the fiducial point, (phi_0,theta_0).</span>
<a name="l00262"></a>00262 <span class="comment">* Default is 0 (false).</span>
<a name="l00263"></a>00263 <span class="comment">*</span>
<a name="l00264"></a>00264 <span class="comment">* double phi0</span>
<a name="l00265"></a>00265 <span class="comment">* (Given) The native longitude, phi_0 [deg], and ...</span>
<a name="l00266"></a>00266 <span class="comment">*</span>
<a name="l00267"></a>00267 <span class="comment">* double theta0</span>
<a name="l00268"></a>00268 <span class="comment">* (Given) ... the native latitude, theta_0 [deg], of the fiducial point,</span>
<a name="l00269"></a>00269 <span class="comment">* i.e. the point whose celestial coordinates are given in</span>
<a name="l00270"></a>00270 <span class="comment">* celprm::ref[1:2]. If undefined (set to a magic value by prjini()) the</span>
<a name="l00271"></a>00271 <span class="comment">* initialization routine, celset(), will set this to a projection-specific</span>
<a name="l00272"></a>00272 <span class="comment">* default.</span>
<a name="l00273"></a>00273 <span class="comment">*</span>
<a name="l00274"></a>00274 <span class="comment">* double ref[4]</span>
<a name="l00275"></a>00275 <span class="comment">* (Given) The first pair of values should be set to the celestial</span>
<a name="l00276"></a>00276 <span class="comment">* longitude and latitude of the fiducial point [deg] - typically right</span>
<a name="l00277"></a>00277 <span class="comment">* ascension and declination. These are given by the CRVALia keywords in</span>
<a name="l00278"></a>00278 <span class="comment">* FITS.</span>
<a name="l00279"></a>00279 <span class="comment">*</span>
<a name="l00280"></a>00280 <span class="comment">* (Given and returned) The second pair of values are the native longitude,</span>
<a name="l00281"></a>00281 <span class="comment">* phi_p [deg], and latitude, theta_p [deg], of the celestial pole (the</span>
<a name="l00282"></a>00282 <span class="comment">* latter is the same as the celestial latitude of the native pole,</span>
<a name="l00283"></a>00283 <span class="comment">* delta_p) and these are given by the FITS keywords LONPOLEa and LATPOLEa</span>
<a name="l00284"></a>00284 <span class="comment">* (or by PVi_2a and PVi_3a attached to the longitude axis which take</span>
<a name="l00285"></a>00285 <span class="comment">* precedence if defined).</span>
<a name="l00286"></a>00286 <span class="comment">*</span>
<a name="l00287"></a>00287 <span class="comment">* LONPOLEa defaults to phi_0 (see above) if the celestial latitude of the</span>
<a name="l00288"></a>00288 <span class="comment">* fiducial point of the projection is greater than or equal to the native</span>
<a name="l00289"></a>00289 <span class="comment">* latitude, otherwise phi_0 + 180 [deg]. (This is the condition for the</span>
<a name="l00290"></a>00290 <span class="comment">* celestial latitude to increase in the same direction as the native</span>
<a name="l00291"></a>00291 <span class="comment">* latitude at the fiducial point.) ref[2] may be set to UNDEFINED (from</span>
<a name="l00292"></a>00292 <span class="comment">* wcsmath.h) or 999.0 to indicate that the correct default should be</span>
<a name="l00293"></a>00293 <span class="comment">* substituted.</span>
<a name="l00294"></a>00294 <span class="comment">*</span>
<a name="l00295"></a>00295 <span class="comment">* theta_p, the native latitude of the celestial pole (or equally the</span>
<a name="l00296"></a>00296 <span class="comment">* celestial latitude of the native pole, delta_p) is often determined</span>
<a name="l00297"></a>00297 <span class="comment">* uniquely by CRVALia and LONPOLEa in which case LATPOLEa is ignored.</span>
<a name="l00298"></a>00298 <span class="comment">* However, in some circumstances there are two valid solutions for theta_p</span>
<a name="l00299"></a>00299 <span class="comment">* and LATPOLEa is used to choose between them. LATPOLEa is set in ref[3]</span>
<a name="l00300"></a>00300 <span class="comment">* and the solution closest to this value is used to reset ref[3]. It is</span>
<a name="l00301"></a>00301 <span class="comment">* therefore legitimate, for example, to set ref[3] to +90.0 to choose the</span>
<a name="l00302"></a>00302 <span class="comment">* more northerly solution - the default if the LATPOLEa keyword is omitted</span>
<a name="l00303"></a>00303 <span class="comment">* from the FITS header. For the special case where the fiducial point of</span>
<a name="l00304"></a>00304 <span class="comment">* the projection is at native latitude zero, its celestial latitude is</span>
<a name="l00305"></a>00305 <span class="comment">* zero, and LONPOLEa = +/- 90.0 then the celestial latitude of the native</span>
<a name="l00306"></a>00306 <span class="comment">* pole is not determined by the first three reference values and LATPOLEa</span>
<a name="l00307"></a>00307 <span class="comment">* specifies it completely.</span>
<a name="l00308"></a>00308 <span class="comment">*</span>
<a name="l00309"></a>00309 <span class="comment">* The returned value, celprm::latpreq, specifies how LATPOLEa was actually</span>
<a name="l00310"></a>00310 <span class="comment">* used.</span>
<a name="l00311"></a>00311 <span class="comment">*</span>
<a name="l00312"></a>00312 <span class="comment">* struct prjprm prj</span>
<a name="l00313"></a>00313 <span class="comment">* (Given and returned) Projection parameters described in the prologue to</span>
<a name="l00314"></a>00314 <span class="comment">* prj.h.</span>
<a name="l00315"></a>00315 <span class="comment">*</span>
<a name="l00316"></a>00316 <span class="comment">* double euler[5]</span>
<a name="l00317"></a>00317 <span class="comment">* (Returned) Euler angles and associated intermediaries derived from the</span>
<a name="l00318"></a>00318 <span class="comment">* coordinate reference values. The first three values are the Z-, X-, and</span>
<a name="l00319"></a>00319 <span class="comment">* Z'-Euler angles [deg], and the remaining two are the cosine and sine of</span>
<a name="l00320"></a>00320 <span class="comment">* the X-Euler angle.</span>
<a name="l00321"></a>00321 <span class="comment">*</span>
<a name="l00322"></a>00322 <span class="comment">* int latpreq</span>
<a name="l00323"></a>00323 <span class="comment">* (Returned) For informational purposes, this indicates how the LATPOLEa</span>
<a name="l00324"></a>00324 <span class="comment">* keyword was used</span>
<a name="l00325"></a>00325 <span class="comment">* - 0: Not required, theta_p (== delta_p) was determined uniquely by the</span>
<a name="l00326"></a>00326 <span class="comment">* CRVALia and LONPOLEa keywords.</span>
<a name="l00327"></a>00327 <span class="comment">* - 1: Required to select between two valid solutions of theta_p.</span>
<a name="l00328"></a>00328 <span class="comment">* - 2: theta_p was specified solely by LATPOLEa.</span>
<a name="l00329"></a>00329 <span class="comment">*</span>
<a name="l00330"></a>00330 <span class="comment">* int isolat</span>
<a name="l00331"></a>00331 <span class="comment">* (Returned) True if the spherical rotation preserves the magnitude of the</span>
<a name="l00332"></a>00332 <span class="comment">* latitude, which occurs iff the axes of the native and celestial</span>
<a name="l00333"></a>00333 <span class="comment">* coordinates are coincident. It signals an opportunity to cache</span>
<a name="l00334"></a>00334 <span class="comment">* intermediate calculations common to all elements in a vector</span>
<a name="l00335"></a>00335 <span class="comment">* computation.</span>
<a name="l00336"></a>00336 <span class="comment">*</span>
<a name="l00337"></a>00337 <span class="comment">* struct wcserr *err</span>
<a name="l00338"></a>00338 <span class="comment">* (Returned) If enabled, when an error status is returned this struct</span>
<a name="l00339"></a>00339 <span class="comment">* contains detailed information about the error, see wcserr_enable().</span>
<a name="l00340"></a>00340 <span class="comment">*</span>
<a name="l00341"></a>00341 <span class="comment">* void *padding</span>
<a name="l00342"></a>00342 <span class="comment">* (An unused variable inserted for alignment purposes only.)</span>
<a name="l00343"></a>00343 <span class="comment">*</span>
<a name="l00344"></a>00344 <span class="comment">* Global variable: const char *cel_errmsg[] - Status return messages</span>
<a name="l00345"></a>00345 <span class="comment">* ------------------------------------------------------------------</span>
<a name="l00346"></a>00346 <span class="comment">* Status messages to match the status value returned from each function.</span>
<a name="l00347"></a>00347 <span class="comment">*</span>
<a name="l00348"></a>00348 <span class="comment">*===========================================================================*/</span>
<a name="l00349"></a>00349
<a name="l00350"></a>00350 <span class="preprocessor">#ifndef WCSLIB_CEL</span>
<a name="l00351"></a>00351 <span class="preprocessor"></span><span class="preprocessor">#define WCSLIB_CEL</span>
<a name="l00352"></a>00352 <span class="preprocessor"></span>
<a name="l00353"></a>00353 <span class="preprocessor">#include "<a class="code" href="prj_8h.html">prj.h</a>"</span>
<a name="l00354"></a>00354 <span class="preprocessor">#include "<a class="code" href="wcserr_8h.html">wcserr.h</a>"</span>
<a name="l00355"></a>00355
<a name="l00356"></a>00356 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00357"></a>00357 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {
<a name="l00358"></a>00358 <span class="preprocessor">#endif</span>
<a name="l00359"></a>00359 <span class="preprocessor"></span>
<a name="l00360"></a>00360
<a name="l00361"></a>00361 <span class="keyword">extern</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code" href="cel_8h.html#2ac33dbe3aa2efff60543213b0a691f5">cel_errmsg</a>[];
<a name="l00362"></a>00362
<a name="l00363"></a><a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c31">00363</a> <span class="keyword">enum</span> <a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c31">cel_errmsg_enum</a> {
<a name="l00364"></a><a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c314ca7a593593157772f3788801138dd12">00364</a> <a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c314ca7a593593157772f3788801138dd12">CELERR_SUCCESS</a> = 0, <span class="comment">/* Success. */</span>
<a name="l00365"></a><a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c317fa1e5cb9c23e5f138638dad3f938e1e">00365</a> <a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c317fa1e5cb9c23e5f138638dad3f938e1e">CELERR_NULL_POINTER</a> = 1, <span class="comment">/* Null celprm pointer passed. */</span>
<a name="l00366"></a><a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c3133a743bdcdd17bae9c6961234ed6b642">00366</a> <a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c3133a743bdcdd17bae9c6961234ed6b642">CELERR_BAD_PARAM</a> = 2, <span class="comment">/* Invalid projection parameters. */</span>
<a name="l00367"></a><a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c31367cf89b74764f9462bfa50c2eb50fb6">00367</a> <a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c31367cf89b74764f9462bfa50c2eb50fb6">CELERR_BAD_COORD_TRANS</a> = 3, <span class="comment">/* Invalid coordinate transformation</span>
<a name="l00368"></a>00368 <span class="comment"> parameters. */</span>
<a name="l00369"></a><a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c31cb1dec1ea393b198b93a26425ee901a2">00369</a> <a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c31cb1dec1ea393b198b93a26425ee901a2">CELERR_ILL_COORD_TRANS</a> = 4, <span class="comment">/* Ill-conditioned coordinated transformation</span>
<a name="l00370"></a>00370 <span class="comment"> parameters. */</span>
<a name="l00371"></a><a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c3144042efc5a9894182447dfcbcd24e1d4">00371</a> <a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c3144042efc5a9894182447dfcbcd24e1d4">CELERR_BAD_PIX</a> = 5, <span class="comment">/* One or more of the (x,y) coordinates were</span>
<a name="l00372"></a>00372 <span class="comment"> invalid. */</span>
<a name="l00373"></a><a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c31ac8beaf37d754d1a7a7aab5307a2140b">00373</a> <a class="code" href="cel_8h.html#b20292954fb236dafb2cd78aee121c31ac8beaf37d754d1a7a7aab5307a2140b">CELERR_BAD_WORLD</a> = 6 <span class="comment">/* One or more of the (lng,lat) coordinates</span>
<a name="l00374"></a>00374 <span class="comment"> were invalid. */</span>
<a name="l00375"></a>00375 };
<a name="l00376"></a>00376
<a name="l00377"></a><a class="code" href="structcelprm.html">00377</a> <span class="keyword">struct </span><a class="code" href="structcelprm.html" title="Celestial transformation parameters.">celprm</a> {
<a name="l00378"></a>00378 <span class="comment">/* Initialization flag (see the prologue above). */</span>
<a name="l00379"></a>00379 <span class="comment">/*------------------------------------------------------------------------*/</span>
<a name="l00380"></a><a class="code" href="structcelprm.html#408a39c1d060d5b32f884f8a8c60aaa2">00380</a> <span class="keywordtype">int</span> <a class="code" href="structcelprm.html#408a39c1d060d5b32f884f8a8c60aaa2">flag</a>; <span class="comment">/* Set to zero to force initialization. */</span>
<a name="l00381"></a>00381
<a name="l00382"></a>00382 <span class="comment">/* Parameters to be provided (see the prologue above). */</span>
<a name="l00383"></a>00383 <span class="comment">/*------------------------------------------------------------------------*/</span>
<a name="l00384"></a><a class="code" href="structcelprm.html#74585275b64c292b394b74f2f19a8048">00384</a> <span class="keywordtype">int</span> <a class="code" href="structcelprm.html#74585275b64c292b394b74f2f19a8048">offset</a>; <span class="comment">/* Force (x,y) = (0,0) at (phi_0,theta_0). */</span>
<a name="l00385"></a><a class="code" href="structcelprm.html#011e38b3a5505fdc13855348571bfad1">00385</a> <span class="keywordtype">double</span> <a class="code" href="structcelprm.html#b034f85dc785113c396c9864cdddfe52">phi0</a>, <a class="code" href="structcelprm.html#011e38b3a5505fdc13855348571bfad1">theta0</a>; <span class="comment">/* Native coordinates of fiducial point. */</span>
<a name="l00386"></a><a class="code" href="structcelprm.html#3f9ae993e97f0e73e3f59117929eeda6">00386</a> <span class="keywordtype">double</span> <a class="code" href="structcelprm.html#3f9ae993e97f0e73e3f59117929eeda6">ref</a>[4]; <span class="comment">/* Celestial coordinates of fiducial */</span>
<a name="l00387"></a>00387 <span class="comment">/* point and native coordinates of */</span>
<a name="l00388"></a>00388 <span class="comment">/* celestial pole. */</span>
<a name="l00389"></a>00389
<a name="l00390"></a><a class="code" href="structcelprm.html#be1991f17c0ecb857d5bd30a6a689b84">00390</a> <span class="keyword">struct </span><a class="code" href="structprjprm.html" title="Projection parameters.">prjprm</a> <a class="code" href="structcelprm.html#be1991f17c0ecb857d5bd30a6a689b84">prj</a>; <span class="comment">/* Projection parameters (see prj.h). */</span>
<a name="l00391"></a>00391
<a name="l00392"></a>00392 <span class="comment">/* Information derived from the parameters supplied. */</span>
<a name="l00393"></a>00393 <span class="comment">/*------------------------------------------------------------------------*/</span>
<a name="l00394"></a><a class="code" href="structcelprm.html#80ea2023638ededd2760cc9a260c456b">00394</a> <span class="keywordtype">double</span> <a class="code" href="structcelprm.html#80ea2023638ededd2760cc9a260c456b">euler</a>[5]; <span class="comment">/* Euler angles and functions thereof. */</span>
<a name="l00395"></a><a class="code" href="structcelprm.html#756c8f0991a748ab47361b0215c4577b">00395</a> <span class="keywordtype">int</span> <a class="code" href="structcelprm.html#756c8f0991a748ab47361b0215c4577b">latpreq</a>; <span class="comment">/* LATPOLEa requirement. */</span>
<a name="l00396"></a><a class="code" href="structcelprm.html#7bb5e1ff4d73c884d73eeb0f8f2677d7">00396</a> <span class="keywordtype">int</span> <a class="code" href="structcelprm.html#7bb5e1ff4d73c884d73eeb0f8f2677d7">isolat</a>; <span class="comment">/* True if |latitude| is preserved. */</span>
<a name="l00397"></a>00397
<a name="l00398"></a>00398 <span class="comment">/* Error handling */</span>
<a name="l00399"></a>00399 <span class="comment">/*------------------------------------------------------------------------*/</span>
<a name="l00400"></a><a class="code" href="structcelprm.html#1b9cbfd7cfa2306464d57dc4acd03b06">00400</a> <span class="keyword">struct </span><a class="code" href="structwcserr.html" title="Error message handling.">wcserr</a> *<a class="code" href="structcelprm.html#1b9cbfd7cfa2306464d57dc4acd03b06">err</a>;
<a name="l00401"></a>00401
<a name="l00402"></a>00402 <span class="comment">/* Private */</span>
<a name="l00403"></a>00403 <span class="comment">/*------------------------------------------------------------------------*/</span>
<a name="l00404"></a><a class="code" href="structcelprm.html#07d1785f7d7a8793555147140757956d">00404</a> <span class="keywordtype">void</span> *<a class="code" href="structcelprm.html#07d1785f7d7a8793555147140757956d">padding</a>; <span class="comment">/* (Dummy inserted for alignment purposes.) */</span>
<a name="l00405"></a>00405 };
<a name="l00406"></a>00406
<a name="l00407"></a>00407 <span class="comment">/* Size of the celprm struct in int units, used by the Fortran wrappers. */</span>
<a name="l00408"></a><a class="code" href="cel_8h.html#055ad88aa219a0207e221d62e03d2e23">00408</a> <span class="preprocessor">#define CELLEN (sizeof(struct celprm)/sizeof(int))</span>
<a name="l00409"></a>00409 <span class="preprocessor"></span>
<a name="l00410"></a>00410
<a name="l00411"></a>00411 <span class="keywordtype">int</span> <a class="code" href="cel_8h.html#1fe1b137ade45ea28e61f44d4708fb77" title="Default constructor for the celprm struct.">celini</a>(<span class="keyword">struct</span> <a class="code" href="structcelprm.html" title="Celestial transformation parameters.">celprm</a> *cel);
<a name="l00412"></a>00412
<a name="l00413"></a>00413 <span class="keywordtype">int</span> <a class="code" href="cel_8h.html#39bb7bf8e545c200191d51884ecfb89b" title="Destructor for the celprm struct.">celfree</a>(<span class="keyword">struct</span> <a class="code" href="structcelprm.html" title="Celestial transformation parameters.">celprm</a> *cel);
<a name="l00414"></a>00414
<a name="l00415"></a>00415 <span class="keywordtype">int</span> <a class="code" href="cel_8h.html#db2e4565f61a9de5fe278d9035850dc3" title="Print routine for the celprm struct.">celprt</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code" href="structcelprm.html" title="Celestial transformation parameters.">celprm</a> *cel);
<a name="l00416"></a>00416
<a name="l00417"></a>00417 <span class="keywordtype">int</span> <a class="code" href="cel_8h.html#b0f67d1727750616f71c7bfcb3a037b6" title="Setup routine for the celprm struct.">celset</a>(<span class="keyword">struct</span> <a class="code" href="structcelprm.html" title="Celestial transformation parameters.">celprm</a> *cel);
<a name="l00418"></a>00418
<a name="l00419"></a>00419 <span class="keywordtype">int</span> <a class="code" href="cel_8h.html#1fe7f134670262eb54b6049c0275a27b" title="Pixel-to-world celestial transformation.">celx2s</a>(<span class="keyword">struct</span> <a class="code" href="structcelprm.html" title="Celestial transformation parameters.">celprm</a> *cel, <span class="keywordtype">int</span> nx, <span class="keywordtype">int</span> ny, <span class="keywordtype">int</span> sxy, <span class="keywordtype">int</span> sll,
<a name="l00420"></a>00420 <span class="keyword">const</span> <span class="keywordtype">double</span> x[], <span class="keyword">const</span> <span class="keywordtype">double</span> y[],
<a name="l00421"></a>00421 <span class="keywordtype">double</span> phi[], <span class="keywordtype">double</span> theta[], <span class="keywordtype">double</span> lng[], <span class="keywordtype">double</span> lat[],
<a name="l00422"></a>00422 <span class="keywordtype">int</span> stat[]);
<a name="l00423"></a>00423
<a name="l00424"></a>00424 <span class="keywordtype">int</span> <a class="code" href="cel_8h.html#6661c05703158b0808038b7d551f1ea1" title="World-to-pixel celestial transformation.">cels2x</a>(<span class="keyword">struct</span> <a class="code" href="structcelprm.html" title="Celestial transformation parameters.">celprm</a> *cel, <span class="keywordtype">int</span> nlng, <span class="keywordtype">int</span> nlat, <span class="keywordtype">int</span> sll, <span class="keywordtype">int</span> sxy,
<a name="l00425"></a>00425 <span class="keyword">const</span> <span class="keywordtype">double</span> lng[], <span class="keyword">const</span> <span class="keywordtype">double</span> lat[],
<a name="l00426"></a>00426 <span class="keywordtype">double</span> phi[], <span class="keywordtype">double</span> theta[], <span class="keywordtype">double</span> x[], <span class="keywordtype">double</span> y[],
<a name="l00427"></a>00427 <span class="keywordtype">int</span> stat[]);
<a name="l00428"></a>00428
<a name="l00429"></a>00429
<a name="l00430"></a>00430 <span class="comment">/* Deprecated. */</span>
<a name="l00431"></a><a class="code" href="cel_8h.html#0474e3e2d6c39249acbe58cedd573e84">00431</a> <span class="preprocessor">#define celini_errmsg cel_errmsg</span>
<a name="l00432"></a><a class="code" href="cel_8h.html#9e188b582ee4eb815466e86bb684fc82">00432</a> <span class="preprocessor"></span><span class="preprocessor">#define celprt_errmsg cel_errmsg</span>
<a name="l00433"></a><a class="code" href="cel_8h.html#2fe5a30084717036a54e7f0a920da105">00433</a> <span class="preprocessor"></span><span class="preprocessor">#define celset_errmsg cel_errmsg</span>
<a name="l00434"></a><a class="code" href="cel_8h.html#f72e24d2f169c3c343c55c880a74050f">00434</a> <span class="preprocessor"></span><span class="preprocessor">#define celx2s_errmsg cel_errmsg</span>
<a name="l00435"></a><a class="code" href="cel_8h.html#c398f2bea2deac6d86c10a7b3efca966">00435</a> <span class="preprocessor"></span><span class="preprocessor">#define cels2x_errmsg cel_errmsg</span>
<a name="l00436"></a>00436 <span class="preprocessor"></span>
<a name="l00437"></a>00437 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00438"></a>00438 <span class="preprocessor"></span>}
<a name="l00439"></a>00439 <span class="preprocessor">#endif</span>
<a name="l00440"></a>00440 <span class="preprocessor"></span>
<a name="l00441"></a>00441 <span class="preprocessor">#endif </span><span class="comment">/* WCSLIB_CEL */</span>
</pre></div></div>
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