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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>WCSLIB 4.8.2: wcsprm Struct Reference</title>
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<h1>wcsprm Struct Reference</h1><!-- doxytag: class="wcsprm" -->Coordinate transformation parameters.
<a href="#_details">More...</a>
<p>
<code>#include <<a class="el" href="wcs_8h-source.html">wcs.h</a>></code>
<p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Data Fields</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#35bff8de85e5a8892e1b68db69ca7a68">flag</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#70cac2976524a5f0a6aeb2b3fcb95834">naxis</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#adad828f07e3affd1511e533b00da19f">crpix</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#3495a5b0ef529706ec9a0af5c3163d63">pc</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#de355cdce054938cfa36e06ef9c51446">cdelt</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#7a0a1ce2432cef9377f70367ea1fd18c">crval</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char(* </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#a0ae3f3605566be2e85e51e5b52c3b52">cunit</a> )[72]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char(* </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#e1f462606974e1324cd38f143eda691e">ctype</a> )[72]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#f8f679749574250cb9ba09e1f05fab5d">lonpole</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#5e04127eb71da6e1350467a7a6d236f5">latpole</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#da1b98589c0127d34766b4c6b5d6cb41">restfrq</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#5d0b60efc55a61525b9beb26ead4859e">restwav</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#0e31f1eef036258c2957da9b985945dd">npv</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#912eed291f15134e8cfb8750acc6c4bc">npvmax</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structpvcard.html">pvcard</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#04fbd6ed1b338e225f2291523e64be2c">pv</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#4c89dafecd036e169f96cb84d53ace65">nps</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#42052d557bdef2c5640a6d19b6d9ed8b">npsmax</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structpscard.html">pscard</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#9eca2fcc30058310d020181ae16bf256">ps</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#fd2f31d782b3becce4ca2f9b495ec0b1">cd</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#f124a4259475ea355ced38e73a05363a">crota</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#8b3a65921acc0dabfa4efd19a003ea6e">altlin</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#c3c9c869bef4e4850dfd9762b33ce908">velref</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#e7609283351ea46484690f873f8ea9c3">alt</a> [4]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#9ee8fb568ca75874bab00825b768f8ca">colnum</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#7320fc64e7705cc7495eba07482b5c55">colax</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char(* </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#922f0f57b8c35cad3d01ceedeba01d4b">cname</a> )[72]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#49eee6450b1a646d3fe01b8965a63af4">crder</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#15485177ea8bbacefc29a5a5cba98c8f">csyer</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#e6b40e2adeb31414871c7cae68619d63">dateavg</a> [72]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#ad387ccbd7847672b5dc2223d9124120">dateobs</a> [72]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#88b55f6c8d122f3ff63532de85698864">equinox</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#0730c37f09502eb364f4e7d7addb8ab8">mjdavg</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#c0cb013b1505fb7abd4167ac0db0e0aa">mjdobs</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#6a88e64207df5007151c2c25028ce3eb">obsgeo</a> [3]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#65801f93622504672ee3faf8f2110e48">radesys</a> [72]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#c089e5d0e3191255ceaea7f8591b27ea">specsys</a> [72]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#9eac54f497e1244c8106dd3ebba12223">ssysobs</a> [72]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#f300da5a94594a9769ab312bb56dde83">velosys</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#0936d10c2ac93d13d096b1711ac639a1">zsource</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#8715975565c8bbd0c562a32eee40fd20">ssyssrc</a> [72]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#9fd60ce9e6bc31df07ed02ce64b48be4">velangl</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#2166fb650f937d8870711d8be5986b66">wcsname</a> [72]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#94c26ce331cc876d63baeeada9820241">ntab</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#8625c0a6ff99c754566c46c2372df801">nwtb</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structtabprm.html">tabprm</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#292133b2b7143b969a3af6a3f2cf3709">tab</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structwtbarr.html">wtbarr</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#9063e8d0c956e9eae7f7d6f3608b9ed2">wtb</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#5b56e1b378a6ae9f8dfff5c364f0653c">lngtyp</a> [8]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#e352318ce3202dab1b5db8b9ceec7703">lattyp</a> [8]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#08098820949433d1336841d32d0b62b5">lng</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#b7f7173e6d2b1b8028a3275bdd751e79">lat</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#b9729795155b8f37afd80784fb70068b">spec</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#de8495d3ca5047eeadba5934d0bb2708">cubeface</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#b63cdcf6ff8febd1b40d0e044ca7d7ef">types</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#b253d36f0dc1716952285c6078622e66">padding</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structlinprm.html">linprm</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#3224bd06f8f4d2d7d398533eb44a49e8">lin</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structcelprm.html">celprm</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#c8391dd770637dbb841067996b7777ba">cel</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structspcprm.html">spcprm</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#e83952aec7c1ac76c090bc89bf4eeea7">spc</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structwcserr.html">wcserr</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#f54ce939604be183231f0ee006e2f8ed">err</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#603ef3ab7f3bc42cf8d8bf99b79b63ac">m_padding</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#5780880281f2f9d085d2e06919b7647a">m_flag</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#5ed753e401cda620a04adfb4ebfb8e0d">m_naxis</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#164e3852bcd2dea8b5f73e1dff79ddf5">m_crpix</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#6778d31ec5a2ee643dc5f0a8af630b03">m_pc</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#42e0ff2da3b0c1ca0a9509f787ed1951">m_cdelt</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#5072893bd9beddb33967697d501acdce">m_crval</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char(* </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#f1cb3e68560d1ac42c620cfe3900af95">m_cunit</a> )[72]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char((* </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#ee7f71c872491b25e1d1440e5dfa8153">m_ctype</a> )[72]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structpvcard.html">pvcard</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#6a3fa7adc304567271c5cc0eda3ac986">m_pv</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structpscard.html">pscard</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#042875def8cab8354c5b2c40ab9fa374">m_ps</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#7a88af56c4c978c6d4213ae1f4bec87a">m_cd</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#5444415c94c7ab0226788f5efe93221d">m_crota</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#4ed527b90d49e8365c1b727f7bec29c7">m_colax</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char(* </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#092c11d209ecdd16bb79858c68e4d582">m_cname</a> )[72]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#0d15534535c7f9308c9daa2cceff29e7">m_crder</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#13fab263ca03f35844fdaca289b7dfac">m_csyer</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structtabprm.html">tabprm</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#e09d5bf005e3bd7ee880353e8816ceb8">m_tab</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structwtbarr.html">wtbarr</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structwcsprm.html#ce7e0986c79d73bd3a0613034b71974f">m_wtb</a></td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
The <b>wcsprm</b> struct contains information required to transform world coordinates. It consists of certain members that must be set by the user (<em>given</em>) and others that are set by the WCSLIB routines (<em>returned</em>). Some of the former are not actually required for transforming coordinates. These are described as "auxiliary"; the struct simply provides a place to store them, though they may be used by <a class="el" href="wcshdr_8h.html#0b8372e555a2e2bcc63a11f3dc7a1bf6" title="Write out a wcsprm struct as a FITS header.">wcshdo()</a> in constructing a FITS header from a <b>wcsprm</b> struct. Some of the returned values are supplied for informational purposes and others are for internal use only as indicated.<p>
In practice, it is expected that a WCS parser would scan the FITS header to determine the number of coordinate axes. It would then use <a class="el" href="wcs_8h.html#2afc8255fde0965dddaa374463666d45" title="Default constructor for the wcsprm struct.">wcsini()</a> to allocate memory for arrays in the <b>wcsprm</b> struct and set default values. Then as it reread the header and identified each WCS keyrecord it would load the value into the relevant <b>wcsprm</b> array element. This is essentially what <a class="el" href="wcshdr_8h.html#c75623ee805ab7d43b0bba684c719a60" title="FITS WCS parser routine for image headers.">wcspih()</a> does - refer to the prologue of <a class="el" href="wcshdr_8h.html">wcshdr.h</a>. As the final step, <a class="el" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset()</a> is invoked, either directly or indirectly, to set the derived members of the <b>wcsprm</b> struct. <a class="el" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset()</a> strips off trailing blanks in all string members and null-fills the character array. <hr><h2>Field Documentation</h2>
<a class="anchor" name="35bff8de85e5a8892e1b68db69ca7a68"></a><!-- doxytag: member="wcsprm::flag" ref="35bff8de85e5a8892e1b68db69ca7a68" args="" -->
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<td class="memname">int <a class="el" href="structwcsprm.html#35bff8de85e5a8892e1b68db69ca7a68">wcsprm::flag</a> </td>
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(Given and returned) This flag must be set to zero whenever any of the following <b>wcsprm</b> struct members are set or changed:<p>
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<a class="el" href="structwcsprm.html#70cac2976524a5f0a6aeb2b3fcb95834">wcsprm::naxis</a> (q.v., not normally set by the user), </li>
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<a class="el" href="structwcsprm.html#adad828f07e3affd1511e533b00da19f">wcsprm::crpix</a>, </li>
<li>
<a class="el" href="structwcsprm.html#3495a5b0ef529706ec9a0af5c3163d63">wcsprm::pc</a>, </li>
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<a class="el" href="structwcsprm.html#de355cdce054938cfa36e06ef9c51446">wcsprm::cdelt</a>, </li>
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<a class="el" href="structwcsprm.html#7a0a1ce2432cef9377f70367ea1fd18c">wcsprm::crval</a>, </li>
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<a class="el" href="structwcsprm.html#a0ae3f3605566be2e85e51e5b52c3b52">wcsprm::cunit</a>, </li>
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<a class="el" href="structwcsprm.html#e1f462606974e1324cd38f143eda691e">wcsprm::ctype</a>, </li>
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<a class="el" href="structwcsprm.html#f8f679749574250cb9ba09e1f05fab5d">wcsprm::lonpole</a>, </li>
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<a class="el" href="structwcsprm.html#5e04127eb71da6e1350467a7a6d236f5">wcsprm::latpole</a>, </li>
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<a class="el" href="structwcsprm.html#da1b98589c0127d34766b4c6b5d6cb41">wcsprm::restfrq</a>, </li>
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<a class="el" href="structwcsprm.html#5d0b60efc55a61525b9beb26ead4859e">wcsprm::restwav</a>, </li>
<li>
<a class="el" href="structwcsprm.html#0e31f1eef036258c2957da9b985945dd">wcsprm::npv</a>, </li>
<li>
<a class="el" href="structwcsprm.html#04fbd6ed1b338e225f2291523e64be2c">wcsprm::pv</a>, </li>
<li>
<a class="el" href="structwcsprm.html#4c89dafecd036e169f96cb84d53ace65">wcsprm::nps</a>, </li>
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<a class="el" href="structwcsprm.html#9eca2fcc30058310d020181ae16bf256">wcsprm::ps</a>, </li>
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<a class="el" href="structwcsprm.html#fd2f31d782b3becce4ca2f9b495ec0b1">wcsprm::cd</a>, </li>
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<a class="el" href="structwcsprm.html#f124a4259475ea355ced38e73a05363a">wcsprm::crota</a>, </li>
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<a class="el" href="structwcsprm.html#8b3a65921acc0dabfa4efd19a003ea6e">wcsprm::altlin</a>. </li>
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<p>
This signals the initialization routine, <a class="el" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset()</a>, to recompute the returned members of the <a class="el" href="structcelprm.html" title="Celestial transformation parameters.">celprm</a> struct. <a class="el" href="cel_8h.html#b0f67d1727750616f71c7bfcb3a037b6" title="Setup routine for the celprm struct.">celset()</a> will reset flag to indicate that this has been done.<p>
<b>PLEASE NOTE:</b> flag should be set to -1 when <a class="el" href="wcs_8h.html#2afc8255fde0965dddaa374463666d45" title="Default constructor for the wcsprm struct.">wcsini()</a> is called for the first time for a particular <b>wcsprm</b> struct in order to initialize memory management. It must ONLY be used on the first initialization otherwise memory leaks may result.
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<a class="anchor" name="70cac2976524a5f0a6aeb2b3fcb95834"></a><!-- doxytag: member="wcsprm::naxis" ref="70cac2976524a5f0a6aeb2b3fcb95834" args="" -->
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<td class="memname">int <a class="el" href="structwcsprm.html#70cac2976524a5f0a6aeb2b3fcb95834">wcsprm::naxis</a> </td>
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(Given or returned) Number of pixel and world coordinate elements.<p>
If <a class="el" href="wcs_8h.html#2afc8255fde0965dddaa374463666d45" title="Default constructor for the wcsprm struct.">wcsini()</a> is used to initialize the <a class="el" href="structlinprm.html" title="Linear transformation parameters.">linprm</a> struct (as would normally be the case) then it will set naxis from the value passed to it as a function argument. The user should not subsequently modify it.
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<a class="anchor" name="adad828f07e3affd1511e533b00da19f"></a><!-- doxytag: member="wcsprm::crpix" ref="adad828f07e3affd1511e533b00da19f" args="" -->
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<td class="memname">double * <a class="el" href="structwcsprm.html#adad828f07e3affd1511e533b00da19f">wcsprm::crpix</a> </td>
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(<em>Given</em>) Address of the first element of an array of double containing the coordinate reference pixel, <code><b>CRPIX</b>ja</code>.
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<a class="anchor" name="3495a5b0ef529706ec9a0af5c3163d63"></a><!-- doxytag: member="wcsprm::pc" ref="3495a5b0ef529706ec9a0af5c3163d63" args="" -->
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<td class="memname">double * <a class="el" href="structwcsprm.html#3495a5b0ef529706ec9a0af5c3163d63">wcsprm::pc</a> </td>
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(<em>Given</em>) Address of the first element of the <code><b>PC</b>i<b>_</b>ja</code> (pixel coordinate) transformation matrix. The expected order is <div class="fragment"><pre class="fragment"> <span class="keyword">struct </span><a class="code" href="structwcsprm.html" title="Coordinate transformation parameters.">wcsprm</a> wcs;
wcs.pc = {PC1_1, PC1_2, PC2_1, PC2_2};
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This may be constructed conveniently from a 2-D array via <div class="fragment"><pre class="fragment"> <span class="keywordtype">double</span> m[2][2] = {{PC1_1, PC1_2},
{PC2_1, PC2_2}};
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which is equivalent to <div class="fragment"><pre class="fragment"> <span class="keywordtype">double</span> m[2][2];
m[0][0] = PC1_1;
m[0][1] = PC1_2;
m[1][0] = PC2_1;
m[1][1] = PC2_2;
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The storage order for this 2-D array is the same as for the 1-D array, whence <div class="fragment"><pre class="fragment"> wcs.pc = *m;
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would be legitimate.
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<a class="anchor" name="de355cdce054938cfa36e06ef9c51446"></a><!-- doxytag: member="wcsprm::cdelt" ref="de355cdce054938cfa36e06ef9c51446" args="" -->
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<td class="memname">double * <a class="el" href="structwcsprm.html#de355cdce054938cfa36e06ef9c51446">wcsprm::cdelt</a> </td>
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(<em>Given</em>) Address of the first element of an array of double containing the coordinate increments, <code><b>CDELT</b>ia</code>.
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<a class="anchor" name="7a0a1ce2432cef9377f70367ea1fd18c"></a><!-- doxytag: member="wcsprm::crval" ref="7a0a1ce2432cef9377f70367ea1fd18c" args="" -->
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<td class="memname">double * <a class="el" href="structwcsprm.html#7a0a1ce2432cef9377f70367ea1fd18c">wcsprm::crval</a> </td>
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(<em>Given</em>) Address of the first element of an array of double containing the coordinate reference values, <code><b>CRVAL</b>ia</code>.
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<td class="memname"><a class="el" href="structwcsprm.html#a0ae3f3605566be2e85e51e5b52c3b52">wcsprm::cunit</a> </td>
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(<em>Given</em>) Address of the first element of an array of char[72] containing the <code><b>CUNIT</b>ia</code> keyvalues which define the units of measurement of the <code><b>CRVAL</b>ia</code>, <code><b>CDELT</b>ia</code>, and <code><b>CD</b>i<b>_</b>ja</code> keywords.<p>
As <code><b>CUNIT</b>ia</code> is an optional header keyword, cunit[][72] may be left blank but otherwise is expected to contain a standard units specification as defined by WCS Paper I. Utility function <a class="el" href="wcsunits_8h.html#560462cb2a7fa7eae6b4f325c85e7911">wcsutrn()</a>, described in <a class="el" href="wcsunits_8h.html">wcsunits.h</a>, is available to translate commonly used non-standard units specifications but this must be done as a separate step before invoking <a class="el" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset()</a>.<p>
For celestial axes, if cunit[][72] is not blank, <a class="el" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset()</a> uses <a class="el" href="wcsunits_8h.html#ef5d64e333f758458b1edaa617911513">wcsunits()</a> to parse it and scale cdelt[], crval[], and cd[][*] to degrees. It then resets cunit[][72] to "deg".<p>
For spectral axes, if cunit[][72] is not blank, <a class="el" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset()</a> uses <a class="el" href="wcsunits_8h.html#ef5d64e333f758458b1edaa617911513">wcsunits()</a> to parse it and scale cdelt[], crval[], and cd[][*] to SI units. It then resets cunit[][72] accordingly.<p>
<a class="el" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset()</a> ignores cunit[][72] for other coordinate types; cunit[][72] may be used to label coordinate values.<p>
These variables accomodate the longest allowed string-valued FITS keyword, being limited to 68 characters, plus the null-terminating character.
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<td class="memname"><a class="el" href="structwcsprm.html#e1f462606974e1324cd38f143eda691e">wcsprm::ctype</a> </td>
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(<em>Given</em>) Address of the first element of an array of char[72] containing the coordinate axis types, <code><b>CTYPE</b>ia</code>.<p>
The ctype[][72] keyword values must be in upper case and there must be zero or one pair of matched celestial axis types, and zero or one spectral axis. The ctype[][72] strings should be padded with blanks on the right and null-terminated so that they are at least eight characters in length.<p>
These variables accomodate the longest allowed string-valued FITS keyword, being limited to 68 characters, plus the null-terminating character.
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<td class="memname">double <a class="el" href="structwcsprm.html#f8f679749574250cb9ba09e1f05fab5d">wcsprm::lonpole</a> </td>
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(Given and returned) The native longitude of the celestial pole, <img class="formulaInl" alt="$\phi_{\mathrm p}$" src="form_5.png">, given by <code><b>LONPOLE</b>a</code> [deg] or by <b><code>PV</code>i<code>_2</code>a</b> [deg] attached to the longitude axis which takes precedence if defined, and ...
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<td class="memname">double <a class="el" href="structwcsprm.html#5e04127eb71da6e1350467a7a6d236f5">wcsprm::latpole</a> </td>
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(Given and returned) ... the native latitude of the celestial pole, <img class="formulaInl" alt="$\theta_{\mathrm p}$" src="form_6.png">, given by <code><b>LATPOLE</b>a</code> [deg] or by <b><code>PV</code>i<code>_3</code>a</b> [deg] attached to the longitude axis which takes precedence if defined.<p>
lonpole and latpole may be left to default to values set by <a class="el" href="wcs_8h.html#2afc8255fde0965dddaa374463666d45" title="Default constructor for the wcsprm struct.">wcsini()</a> (see <a class="el" href="structcelprm.html#3f9ae993e97f0e73e3f59117929eeda6">celprm::ref</a>), but in any case they will be reset by <a class="el" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset()</a> to the values actually used. Note therefore that if the <b>wcsprm</b> struct is reused without resetting them, whether directly or via <a class="el" href="wcs_8h.html#2afc8255fde0965dddaa374463666d45" title="Default constructor for the wcsprm struct.">wcsini()</a>, they will no longer have their default values.
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<td class="memname">double <a class="el" href="structwcsprm.html#da1b98589c0127d34766b4c6b5d6cb41">wcsprm::restfrq</a> </td>
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(<em>Given</em>) The rest frequency [Hz], and/or ...
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<td class="memname">double <a class="el" href="structwcsprm.html#5d0b60efc55a61525b9beb26ead4859e">wcsprm::restwav</a> </td>
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(<em>Given</em>) ... the rest wavelength in vacuuo [m], only one of which need be given, the other should be set to zero.
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<td class="memname">int <a class="el" href="structwcsprm.html#0e31f1eef036258c2957da9b985945dd">wcsprm::npv</a> </td>
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(<em>Given</em>) The number of entries in the <a class="el" href="structwcsprm.html#04fbd6ed1b338e225f2291523e64be2c">wcsprm::pv</a>[] array.
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<td class="memname">int <a class="el" href="structwcsprm.html#912eed291f15134e8cfb8750acc6c4bc">wcsprm::npvmax</a> </td>
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(Given or returned) The length of the <a class="el" href="structwcsprm.html#04fbd6ed1b338e225f2291523e64be2c">wcsprm::pv</a>[] array.<p>
npvmax will be set by <a class="el" href="wcs_8h.html#2afc8255fde0965dddaa374463666d45" title="Default constructor for the wcsprm struct.">wcsini()</a> if it allocates memory for <a class="el" href="structwcsprm.html#04fbd6ed1b338e225f2291523e64be2c">wcsprm::pv</a>[], otherwise it must be set by the user. See also <a class="el" href="wcs_8h.html#42b2578d76ace7ca6114d82b7ae46a89" title="Memory allocation for PVi_ma.">wcsnpv()</a>.
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<td class="memname">struct <a class="el" href="structpvcard.html">pvcard</a> * <a class="el" href="structwcsprm.html#04fbd6ed1b338e225f2291523e64be2c">wcsprm::pv</a><code> [read]</code> </td>
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(Given or returned) Address of the first element of an array of length npvmax of <a class="el" href="structpvcard.html" title="Store for PVi_ma keyrecords.">pvcard</a> structs. Set by <a class="el" href="wcs_8h.html#2afc8255fde0965dddaa374463666d45" title="Default constructor for the wcsprm struct.">wcsini()</a> if it allocates memory for pv[], otherwise it must be set by the user. See also <a class="el" href="wcs_8h.html#42b2578d76ace7ca6114d82b7ae46a89" title="Memory allocation for PVi_ma.">wcsnpv()</a>.<p>
As a FITS header parser encounters each <code><b>PV</b>i<b>_</b>ma</code> keyword it should load it into a <a class="el" href="structpvcard.html" title="Store for PVi_ma keyrecords.">pvcard</a> struct in the array and increment npv. <a class="el" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset()</a> interprets these as required.<p>
Note that, if they were not given, <a class="el" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset()</a> resets the entries for <b><code>PV</code>i<code>_1</code>a</b>, <b><code>PV</code>i<code>_2</code>a</b>, <b><code>PV</code>i<code>_3</code>a</b>, and <b><code>PV</code>i<code>_4</code>a</b> for longitude axis <b>i</b> to match phi_0 and theta_0 (the native longitude and latitude of the reference point), <code><b>LONPOLE</b>a</code> and <code><b>LATPOLE</b>a</code> respectively.
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<td class="memname">int <a class="el" href="structwcsprm.html#4c89dafecd036e169f96cb84d53ace65">wcsprm::nps</a> </td>
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(<em>Given</em>) The number of entries in the <a class="el" href="structwcsprm.html#9eca2fcc30058310d020181ae16bf256">wcsprm::ps</a>[] array.
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<td class="memname">int <a class="el" href="structwcsprm.html#42052d557bdef2c5640a6d19b6d9ed8b">wcsprm::npsmax</a> </td>
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(Given or returned) The length of the <a class="el" href="structwcsprm.html#9eca2fcc30058310d020181ae16bf256">wcsprm::ps</a>[] array.<p>
npsmax will be set by <a class="el" href="wcs_8h.html#2afc8255fde0965dddaa374463666d45" title="Default constructor for the wcsprm struct.">wcsini()</a> if it allocates memory for <a class="el" href="structwcsprm.html#9eca2fcc30058310d020181ae16bf256">wcsprm::ps</a>[], otherwise it must be set by the user. See also <a class="el" href="wcs_8h.html#e790c9ce6c9b7a4845cf1c3c97b1e97a" title="Memory allocation for PSi_ma.">wcsnps()</a>.
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<td class="memname">struct <a class="el" href="structpscard.html">pscard</a> * <a class="el" href="structwcsprm.html#9eca2fcc30058310d020181ae16bf256">wcsprm::ps</a><code> [read]</code> </td>
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(Given or returned) Address of the first element of an array of length npsmax of <a class="el" href="structpscard.html" title="Store for PSi_ma keyrecords.">pscard</a> structs. Set by <a class="el" href="wcs_8h.html#2afc8255fde0965dddaa374463666d45" title="Default constructor for the wcsprm struct.">wcsini()</a> if it allocates memory for ps[], otherwise it must be set by the user. See also <a class="el" href="wcs_8h.html#e790c9ce6c9b7a4845cf1c3c97b1e97a" title="Memory allocation for PSi_ma.">wcsnps()</a>.<p>
As a FITS header parser encounters each <code><b>PS</b>i<b>_</b>ma</code> keyword it should load it into a <a class="el" href="structpscard.html" title="Store for PSi_ma keyrecords.">pscard</a> struct in the array and increment nps. <a class="el" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset()</a> interprets these as required (currently no <code><b>PS</b>i<b>_</b>ma</code> keyvalues are recognized).
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<td class="memname">double * <a class="el" href="structwcsprm.html#fd2f31d782b3becce4ca2f9b495ec0b1">wcsprm::cd</a> </td>
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(<em>Given</em>) For historical compatibility, the <b>wcsprm</b> struct supports two alternate specifications of the linear transformation matrix, those associated with the <code><b>CD</b>i<b>_</b>ja</code> keywords, and ...
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<td class="memname">double * <a class="el" href="structwcsprm.html#f124a4259475ea355ced38e73a05363a">wcsprm::crota</a> </td>
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(<em>Given</em>) ... those associated with the <code><b>CROTA</b>ia</code> keywords. Although these may not formally co-exist with <code><b>PC</b>i<b>_</b>ja</code>, the approach taken here is simply to ignore them if given in conjunction with <code><b>PC</b>i<b>_</b>ja</code>.
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<a class="anchor" name="8b3a65921acc0dabfa4efd19a003ea6e"></a><!-- doxytag: member="wcsprm::altlin" ref="8b3a65921acc0dabfa4efd19a003ea6e" args="" -->
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<td class="memname">int <a class="el" href="structwcsprm.html#8b3a65921acc0dabfa4efd19a003ea6e">wcsprm::altlin</a> </td>
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(<em>Given</em>) altlin is a bit flag that denotes which of the <code><b>PC</b>i<b>_</b>ja</code>, <code><b>CD</b>i<b>_</b>ja</code> and <code><b>CROTA</b>ia</code> keywords are present in the header:<p>
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Bit 0: <code><b>PC</b>i<b>_</b>ja</code> is present.<p>
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Bit 1: <code><b>CD</b>i<b>_</b>ja</code> is present.<p>
Matrix elements in the IRAF convention are equivalent to the product <code><b>CD</b>i<b>_</b>ja</code> = <code><b>CDELT</b>ia</code> * <code><b>PC</b>i<b>_</b>ja</code>, but the defaults differ from that of the <code><b>PC</b>i<b>_</b>ja</code> matrix. If one or more <code><b>CD</b>i<b>_</b>ja</code> keywords are present then all unspecified <code><b>CD</b>i<b>_</b>ja</code> default to zero. If no <code><b>CD</b>i<b>_</b>ja</code> (or <code><b>CROTA</b>ia</code>) keywords are present, then the header is assumed to be in <code><b>PC</b>i<b>_</b>ja</code> form whether or not any <code><b>PC</b>i<b>_</b>ja</code> keywords are present since this results in an interpretation of <code><b>CDELT</b>ia</code> consistent with the original FITS specification.<p>
While <code><b>CD</b>i<b>_</b>ja</code> may not formally co-exist with <code><b>PC</b>i<b>_</b>ja</code>, it may co-exist with <code><b>CDELT</b>ia</code> and <code><b>CROTA</b>ia</code> which are to be ignored.<p>
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Bit 2: <code><b>CROTA</b>ia</code> is present.<p>
In the AIPS convention, <code><b>CROTA</b>ia</code> may only be associated with the latitude axis of a celestial axis pair. It specifies a rotation in the image plane that is applied AFTER the <code><b>CDELT</b>ia</code>; any other <code><b>CROTA</b>ia</code> keywords are ignored.<p>
<code><b>CROTA</b>ia</code> may not formally co-exist with <code><b>PC</b>i<b>_</b>ja</code>.<p>
<code><b>CROTA</b>ia</code> and <code><b>CDELT</b>ia</code> may formally co-exist with <code><b>CD</b>i<b>_</b>ja</code> but if so are to be ignored. </li>
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<code><b>CD</b>i<b>_</b>ja</code> and <code><b>CROTA</b>ia</code> keywords, if found, are to be stored in the <a class="el" href="structwcsprm.html#fd2f31d782b3becce4ca2f9b495ec0b1">wcsprm::cd</a> and <a class="el" href="structwcsprm.html#f124a4259475ea355ced38e73a05363a">wcsprm::crota</a> arrays which are dimensioned similarly to <a class="el" href="structwcsprm.html#3495a5b0ef529706ec9a0af5c3163d63">wcsprm::pc</a> and <a class="el" href="structwcsprm.html#de355cdce054938cfa36e06ef9c51446">wcsprm::cdelt</a>. FITS header parsers should use the following procedure:<p>
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Whenever a <code><b>PC</b>i<b>_</b>ja</code> keyword is encountered: <div class="fragment"><pre class="fragment"> <a class="code" href="structwcsprm.html#8b3a65921acc0dabfa4efd19a003ea6e">altlin</a> |= 1;
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Whenever a <code><b>CD</b>i<b>_</b>ja</code> keyword is encountered: <div class="fragment"><pre class="fragment"> <a class="code" href="structwcsprm.html#8b3a65921acc0dabfa4efd19a003ea6e">altlin</a> |= 2;
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Whenever a <code><b>CROTA</b>ia</code> keyword is encountered: <div class="fragment"><pre class="fragment"> <a class="code" href="structwcsprm.html#8b3a65921acc0dabfa4efd19a003ea6e">altlin</a> |= 4;
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If none of these bits are set the <code><b>PC</b>i<b>_</b>ja</code> representation results, i.e. <a class="el" href="structwcsprm.html#3495a5b0ef529706ec9a0af5c3163d63">wcsprm::pc</a> and <a class="el" href="structwcsprm.html#de355cdce054938cfa36e06ef9c51446">wcsprm::cdelt</a> will be used as given.<p>
These alternate specifications of the linear transformation matrix are translated immediately to <code><b>PC</b>i<b>_</b>ja</code> by <a class="el" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset()</a> and are invisible to the lower-level WCSLIB routines. In particular, <a class="el" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset()</a> resets <a class="el" href="structwcsprm.html#de355cdce054938cfa36e06ef9c51446">wcsprm::cdelt</a> to unity if <code><b>CD</b>i<b>_</b>ja</code> is present (and no <code><b>PC</b>i<b>_</b>ja</code>).<p>
If <code><b>CROTA</b>ia</code> are present but none is associated with the latitude axis (and no <code><b>PC</b>i<b>_</b>ja</code> or <code><b>CD</b>i<b>_</b>ja</code>), then <a class="el" href="wcs_8h.html#e5cc3f5d249755583403cdf54d2ebb91" title="Setup routine for the wcsprm struct.">wcsset()</a> reverts to a unity <code><b>PC</b>i<b>_</b>ja</code> matrix.
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(<em>Given</em>) AIPS velocity code <code><b>VELREF</b></code>, refer to <a class="el" href="spc_8h.html#615d3ef3a505a8be7da1578d9338d218" title="Translate AIPS-convention spectral keywords.">spcaips()</a>.
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(Given, auxiliary) Character code for alternate coordinate descriptions (i.e. the '<b>a</b>' in keyword names such as <code><b>CTYPE</b>ia</code>). This is blank for the primary coordinate description, or one of the 26 upper-case letters, A-Z.<p>
An array of four characters is provided for alignment purposes, only the first is used.
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(Given, auxiliary) Where the coordinate representation is associated with an image-array column in a FITS binary table, this variable may be used to record the relevant column number.<p>
It should be set to zero for an image header or pixel list.
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(Given, auxiliary) Address of the first element of an array of int recording the column numbers for each axis in a pixel list.<p>
The array elements should be set to zero for an image header or image array in a binary table.
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(Given, auxiliary) The address of the first element of an array of char[72] containing the coordinate axis names, <code><b>CNAME</b>ia</code>.<p>
These variables accomodate the longest allowed string-valued FITS keyword, being limited to 68 characters, plus the null-terminating character.
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(Given, auxiliary) Address of the first element of an array of double recording the random error in the coordinate value, <code><b>CRDER</b>ia</code>.
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(Given, auxiliary) Address of the first element of an array of double recording the systematic error in the coordinate value, <code><b>CSYER</b>ia</code>.
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(Given, auxiliary) The date of a representative mid-point of the observation in ISO format, <em>yyyy-mm-dd</em><code><b>T</b></code><em>hh:mm:ss</em>.
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(Given, auxiliary) The date of the start of the observation unless otherwise explained in the comment field of the <code><b>DATE-OBS</b></code> keyword, in ISO format, <em>yyyy-mm-dd</em><code><b>T</b></code><em>hh:mm:ss</em>.
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<td class="memname">double <a class="el" href="structwcsprm.html#88b55f6c8d122f3ff63532de85698864">wcsprm::equinox</a> </td>
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(Given, auxiliary) The equinox associated with dynamical equatorial or ecliptic coordinate systems, <code><b>EQUINOX</b>a</code> (or <code><b>EPOCH</b></code> in older headers). Not applicable to ICRS equatorial or ecliptic coordinates.
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(Given, auxiliary) Modified Julian Date (MJD = JD - 2400000.5), <code><b>MJD-AVG</b></code>, corresponding to <code><b>DATE-AVG</b></code>.
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(Given, auxiliary) Modified Julian Date (MJD = JD - 2400000.5), <code><b>MJD-OBS</b></code>, corresponding to <code><b>DATE-OBS</b></code>.
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(Given, auxiliary) Location of the observer in a standard terrestrial reference frame, <code><b>OBSGEO-X</b></code>, <code><b>OBSGEO-Y</b></code>, <code><b>OBSGEO-Z</b></code> [m].
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(Given, auxiliary) The equatorial or ecliptic coordinate system type, <code><b>RADESYS</b>a</code>.
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<td class="memname">char <a class="el" href="structwcsprm.html#c089e5d0e3191255ceaea7f8591b27ea">wcsprm::specsys</a> </td>
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(Given, auxiliary) Spectral reference frame (standard of rest), <code><b>SPECSYS</b>a</code>, and ...
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(Given, auxiliary) ... the actual frame in which there is no differential variation in the spectral coordinate across the field-of-view, <code><b>SSYSOBS</b>a</code>.
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(Given, auxiliary) The relative radial velocity [m/s] between the observer and the selected standard of rest in the direction of the celestial reference coordinate, <code><b>VELOSYS</b>a</code>.
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(Given, auxiliary) The redshift, <code><b>ZSOURCE</b>a</code>, of the source, and ...
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(Given, auxiliary) ... the spectral reference frame (standard of rest) in which this was measured, <code><b>SSYSSRC</b>a</code>.
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<td class="memname">double <a class="el" href="structwcsprm.html#9fd60ce9e6bc31df07ed02ce64b48be4">wcsprm::velangl</a> </td>
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(Given, auxiliary) The angle [deg] that should be used to decompose an observed velocity into radial and transverse components.
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<td class="memname">char <a class="el" href="structwcsprm.html#2166fb650f937d8870711d8be5986b66">wcsprm::wcsname</a> </td>
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(Given, auxiliary) The name given to the coordinate representation, <code><b>WCSNAME</b>a</code>. This variable accomodates the longest allowed string-valued FITS keyword, being limited to 68 characters, plus the null-terminating character.
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(<em>Given</em>) See <a class="el" href="structwcsprm.html#292133b2b7143b969a3af6a3f2cf3709">wcsprm::tab</a>.
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<td class="memname">int <a class="el" href="structwcsprm.html#8625c0a6ff99c754566c46c2372df801">wcsprm::nwtb</a> </td>
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(<em>Given</em>) See <a class="el" href="structwcsprm.html#9063e8d0c956e9eae7f7d6f3608b9ed2">wcsprm::wtb</a>.
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<td class="memname">struct <a class="el" href="structtabprm.html">tabprm</a> * <a class="el" href="structwcsprm.html#292133b2b7143b969a3af6a3f2cf3709">wcsprm::tab</a><code> [read]</code> </td>
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(<em>Given</em>) Address of the first element of an array of ntab <a class="el" href="structtabprm.html" title="Tabular transformation parameters.">tabprm</a> structs for which memory has been allocated. These are used to store tabular transformation parameters.<p>
Although technically <a class="el" href="structwcsprm.html#94c26ce331cc876d63baeeada9820241">wcsprm::ntab</a> and tab are "given", they will normally be set by invoking <a class="el" href="wcshdr_8h.html#6dd857f7b61a5b349cc8af5a4b6d8a1c" title="Tabular construction routine.">wcstab()</a>, whether directly or indirectly.<p>
The <a class="el" href="structtabprm.html" title="Tabular transformation parameters.">tabprm</a> structs contain some members that must be supplied and others that are derived. The information to be supplied comes primarily from arrays stored in one or more FITS binary table extensions. These arrays, referred to here as "wcstab arrays", are themselves located by parameters stored in the FITS image header.
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<td class="memname">struct <a class="el" href="structwtbarr.html">wtbarr</a> * <a class="el" href="structwcsprm.html#9063e8d0c956e9eae7f7d6f3608b9ed2">wcsprm::wtb</a><code> [read]</code> </td>
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(<em>Given</em>) Address of the first element of an array of nwtb <a class="el" href="structwtbarr.html" title="Extraction of coordinate lookup tables from BINTABLE.">wtbarr</a> structs for which memory has been allocated. These are used in extracting wcstab arrays from a FITS binary table.<p>
Although technically <a class="el" href="structwcsprm.html#8625c0a6ff99c754566c46c2372df801">wcsprm::nwtb</a> and wtb are "given", they will normally be set by invoking <a class="el" href="wcshdr_8h.html#6dd857f7b61a5b349cc8af5a4b6d8a1c" title="Tabular construction routine.">wcstab()</a>, whether directly or indirectly.
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(<em>Returned</em>) Four-character WCS celestial longitude and ...
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(<em>Returned</em>) ... latitude axis types. e.g. "RA", "DEC", "GLON", "GLAT", etc. extracted from '<code><b>RA--</b></code>', '<code><b>DEC-</b></code>', '<code><b>GLON</b></code>', '<code><b>GLAT</b></code>', etc. in the first four characters of <code><b>CTYPE</b>ia</code> but with trailing dashes removed. (Declared as char[8] for alignment reasons.)
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(<em>Returned</em>) Index for the longitude coordinate, and ...
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(<em>Returned</em>) ... index for the latitude coordinate, and ...
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(<em>Returned</em>) ... index for the spectral coordinate in the imgcrd[][] and world[][] arrays in the API of <a class="el" href="wcs_8h.html#27d3dd209db3e76cf4c50f48c01ba986" title="Pixel-to-world transformation.">wcsp2s()</a>, <a class="el" href="wcs_8h.html#60673d05a3513659ac848a9cb3d0cb07" title="World-to-pixel transformation.">wcss2p()</a> and <a class="el" href="wcs_8h.html#f3f00b876c8212d43f32a51feeadaa81" title="Hybrid coordinate transformation.">wcsmix()</a>.<p>
These may also serve as indices into the pixcrd[][] array provided that the <code><b>PC</b>i<b>_</b>ja</code> matrix does not transpose axes.
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<a class="anchor" name="de8495d3ca5047eeadba5934d0bb2708"></a><!-- doxytag: member="wcsprm::cubeface" ref="de8495d3ca5047eeadba5934d0bb2708" args="" -->
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<td class="memname">int <a class="el" href="structwcsprm.html#de8495d3ca5047eeadba5934d0bb2708">wcsprm::cubeface</a> </td>
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<p>
(<em>Returned</em>) Index into the pixcrd[][] array for the <code><b>CUBEFACE</b></code> axis. This is used for quadcube projections where the cube faces are stored on a separate axis (see <a class="el" href="wcs_8h.html">wcs.h</a>).
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<a class="anchor" name="b63cdcf6ff8febd1b40d0e044ca7d7ef"></a><!-- doxytag: member="wcsprm::types" ref="b63cdcf6ff8febd1b40d0e044ca7d7ef" args="" -->
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<td class="memname">int * <a class="el" href="structwcsprm.html#b63cdcf6ff8febd1b40d0e044ca7d7ef">wcsprm::types</a> </td>
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<p>
(<em>Returned</em>) Address of the first element of an array of int containing a four-digit type code for each axis.<p>
<ul>
<li>
First digit (i.e. 1000s): <ul>
<li>
0: Non-specific coordinate type. </li>
<li>
1: Stokes coordinate. </li>
<li>
2: Celestial coordinate (including <code><b>CUBEFACE</b></code>). </li>
<li>
3: Spectral coordinate. </li>
</ul>
<p>
</li>
<li>
Second digit (i.e. 100s): <ul>
<li>
0: Linear axis. </li>
<li>
1: Quantized axis (<code><b>STOKES</b></code>, <code><b>CUBEFACE</b></code>). </li>
<li>
2: Non-linear celestial axis. </li>
<li>
3: Non-linear spectral axis. </li>
<li>
4: Logarithmic axis. </li>
<li>
5: Tabular axis. </li>
</ul>
<p>
</li>
<li>
Third digit (i.e. 10s): <ul>
<li>
0: Group number, e.g. lookup table number, being an index into the <a class="el" href="structtabprm.html" title="Tabular transformation parameters.">tabprm</a> array (see above). </li>
</ul>
<p>
</li>
<li>
The fourth digit is used as a qualifier depending on the axis type.<p>
<ul>
<li>
For celestial axes: <ul>
<li>
0: Longitude coordinate. </li>
<li>
1: Latitude coordinate. </li>
<li>
2: <code><b>CUBEFACE</b></code> number. </li>
</ul>
<p>
</li>
<li>
For lookup tables: the axis number in a multidimensional table. </li>
</ul>
</li>
</ul>
<p>
<code><b>CTYPE</b>ia</code> in "4-3" form with unrecognized algorithm code will have its type set to -1 and generate an error.<p>
void *padding (An unused variable inserted for alignment purposes only.)
</div>
</div><p>
<a class="anchor" name="b253d36f0dc1716952285c6078622e66"></a><!-- doxytag: member="wcsprm::padding" ref="b253d36f0dc1716952285c6078622e66" args="" -->
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<td class="memname">void* <a class="el" href="structwcsprm.html#b253d36f0dc1716952285c6078622e66">wcsprm::padding</a> </td>
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<p>
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<a class="anchor" name="3224bd06f8f4d2d7d398533eb44a49e8"></a><!-- doxytag: member="wcsprm::lin" ref="3224bd06f8f4d2d7d398533eb44a49e8" args="" -->
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<td class="memname">struct <a class="el" href="structlinprm.html">linprm</a> <a class="el" href="structwcsprm.html#3224bd06f8f4d2d7d398533eb44a49e8">wcsprm::lin</a><code> [read]</code> </td>
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<p>
(<em>Returned</em>) Linear transformation parameters (usage is described in the prologue to <a class="el" href="lin_8h.html">lin.h</a>).
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<a class="anchor" name="c8391dd770637dbb841067996b7777ba"></a><!-- doxytag: member="wcsprm::cel" ref="c8391dd770637dbb841067996b7777ba" args="" -->
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<td class="memname">struct <a class="el" href="structcelprm.html">celprm</a> <a class="el" href="structwcsprm.html#c8391dd770637dbb841067996b7777ba">wcsprm::cel</a><code> [read]</code> </td>
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<p>
(<em>Returned</em>) Celestial transformation parameters (usage is described in the prologue to <a class="el" href="cel_8h.html">cel.h</a>).
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<a class="anchor" name="e83952aec7c1ac76c090bc89bf4eeea7"></a><!-- doxytag: member="wcsprm::spc" ref="e83952aec7c1ac76c090bc89bf4eeea7" args="" -->
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<td class="memname">struct <a class="el" href="structspcprm.html">spcprm</a> <a class="el" href="structwcsprm.html#e83952aec7c1ac76c090bc89bf4eeea7">wcsprm::spc</a><code> [read]</code> </td>
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<p>
(<em>Returned</em>) Spectral transformation parameters (usage is described in the prologue to <a class="el" href="spc_8h.html">spc.h</a>).
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<a class="anchor" name="f54ce939604be183231f0ee006e2f8ed"></a><!-- doxytag: member="wcsprm::err" ref="f54ce939604be183231f0ee006e2f8ed" args="" -->
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<td class="memname">struct <a class="el" href="structwcserr.html">wcserr</a> * <a class="el" href="structwcsprm.html#f54ce939604be183231f0ee006e2f8ed">wcsprm::err</a><code> [read]</code> </td>
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<p>
(<em>Returned</em>) If enabled, when an error status is returned this struct contains detailed information about the error, see <a class="el" href="wcserr_8h.html#1691b8bd184d40ca6fda255be078fa53" title="Enable/disable error messaging.">wcserr_enable()</a>.<p>
void *m_padding (For internal use only.)
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<a class="anchor" name="603ef3ab7f3bc42cf8d8bf99b79b63ac"></a><!-- doxytag: member="wcsprm::m_padding" ref="603ef3ab7f3bc42cf8d8bf99b79b63ac" args="" -->
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<td class="memname">void* <a class="el" href="structwcsprm.html#603ef3ab7f3bc42cf8d8bf99b79b63ac">wcsprm::m_padding</a> </td>
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<a class="anchor" name="5780880281f2f9d085d2e06919b7647a"></a><!-- doxytag: member="wcsprm::m_flag" ref="5780880281f2f9d085d2e06919b7647a" args="" -->
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<td class="memname">int <a class="el" href="structwcsprm.html#5780880281f2f9d085d2e06919b7647a">wcsprm::m_flag</a> </td>
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<p>
(For internal use only.)
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<a class="anchor" name="5ed753e401cda620a04adfb4ebfb8e0d"></a><!-- doxytag: member="wcsprm::m_naxis" ref="5ed753e401cda620a04adfb4ebfb8e0d" args="" -->
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<td class="memname">int <a class="el" href="structwcsprm.html#5ed753e401cda620a04adfb4ebfb8e0d">wcsprm::m_naxis</a> </td>
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<p>
(For internal use only.)
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<a class="anchor" name="164e3852bcd2dea8b5f73e1dff79ddf5"></a><!-- doxytag: member="wcsprm::m_crpix" ref="164e3852bcd2dea8b5f73e1dff79ddf5" args="" -->
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<td class="memname">double * <a class="el" href="structwcsprm.html#164e3852bcd2dea8b5f73e1dff79ddf5">wcsprm::m_crpix</a> </td>
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<p>
(For internal use only.)
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<a class="anchor" name="6778d31ec5a2ee643dc5f0a8af630b03"></a><!-- doxytag: member="wcsprm::m_pc" ref="6778d31ec5a2ee643dc5f0a8af630b03" args="" -->
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<td class="memname">double * <a class="el" href="structwcsprm.html#6778d31ec5a2ee643dc5f0a8af630b03">wcsprm::m_pc</a> </td>
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<p>
(For internal use only.)
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<a class="anchor" name="42e0ff2da3b0c1ca0a9509f787ed1951"></a><!-- doxytag: member="wcsprm::m_cdelt" ref="42e0ff2da3b0c1ca0a9509f787ed1951" args="" -->
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<td class="memname">double * <a class="el" href="structwcsprm.html#42e0ff2da3b0c1ca0a9509f787ed1951">wcsprm::m_cdelt</a> </td>
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<p>
(For internal use only.)
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<a class="anchor" name="5072893bd9beddb33967697d501acdce"></a><!-- doxytag: member="wcsprm::m_crval" ref="5072893bd9beddb33967697d501acdce" args="" -->
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<td class="memname">double * <a class="el" href="structwcsprm.html#5072893bd9beddb33967697d501acdce">wcsprm::m_crval</a> </td>
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<p>
(For internal use only.)
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<a class="anchor" name="f1cb3e68560d1ac42c620cfe3900af95"></a><!-- doxytag: member="wcsprm::m_cunit" ref="f1cb3e68560d1ac42c620cfe3900af95" args=")[72]" -->
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<td class="memname"><a class="el" href="structwcsprm.html#f1cb3e68560d1ac42c620cfe3900af95">wcsprm::m_cunit</a> </td>
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<p>
(For internal use only.)
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<a class="anchor" name="ee7f71c872491b25e1d1440e5dfa8153"></a><!-- doxytag: member="wcsprm::m_ctype" ref="ee7f71c872491b25e1d1440e5dfa8153" args=")[72]" -->
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<td class="memname"><a class="el" href="structwcsprm.html#ee7f71c872491b25e1d1440e5dfa8153">wcsprm::m_ctype</a> </td>
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<p>
(For internal use only.)
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<a class="anchor" name="6a3fa7adc304567271c5cc0eda3ac986"></a><!-- doxytag: member="wcsprm::m_pv" ref="6a3fa7adc304567271c5cc0eda3ac986" args="" -->
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<td class="memname">struct <a class="el" href="structpvcard.html">pvcard</a> * <a class="el" href="structwcsprm.html#6a3fa7adc304567271c5cc0eda3ac986">wcsprm::m_pv</a><code> [read]</code> </td>
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<p>
(For internal use only.)
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<a class="anchor" name="042875def8cab8354c5b2c40ab9fa374"></a><!-- doxytag: member="wcsprm::m_ps" ref="042875def8cab8354c5b2c40ab9fa374" args="" -->
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<td class="memname">struct <a class="el" href="structpscard.html">pscard</a> * <a class="el" href="structwcsprm.html#042875def8cab8354c5b2c40ab9fa374">wcsprm::m_ps</a><code> [read]</code> </td>
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<p>
(For internal use only.)
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<a class="anchor" name="7a88af56c4c978c6d4213ae1f4bec87a"></a><!-- doxytag: member="wcsprm::m_cd" ref="7a88af56c4c978c6d4213ae1f4bec87a" args="" -->
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<td class="memname">double * <a class="el" href="structwcsprm.html#7a88af56c4c978c6d4213ae1f4bec87a">wcsprm::m_cd</a> </td>
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<p>
(For internal use only.)
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<a class="anchor" name="5444415c94c7ab0226788f5efe93221d"></a><!-- doxytag: member="wcsprm::m_crota" ref="5444415c94c7ab0226788f5efe93221d" args="" -->
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<td class="memname">double * <a class="el" href="structwcsprm.html#5444415c94c7ab0226788f5efe93221d">wcsprm::m_crota</a> </td>
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(For internal use only.)
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<a class="anchor" name="4ed527b90d49e8365c1b727f7bec29c7"></a><!-- doxytag: member="wcsprm::m_colax" ref="4ed527b90d49e8365c1b727f7bec29c7" args="" -->
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<td class="memname">int * <a class="el" href="structwcsprm.html#4ed527b90d49e8365c1b727f7bec29c7">wcsprm::m_colax</a> </td>
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<p>
(For internal use only.)
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<a class="anchor" name="092c11d209ecdd16bb79858c68e4d582"></a><!-- doxytag: member="wcsprm::m_cname" ref="092c11d209ecdd16bb79858c68e4d582" args=")[72]" -->
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<td class="memname"><a class="el" href="structwcsprm.html#092c11d209ecdd16bb79858c68e4d582">wcsprm::m_cname</a> </td>
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(For internal use only.)
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<a class="anchor" name="0d15534535c7f9308c9daa2cceff29e7"></a><!-- doxytag: member="wcsprm::m_crder" ref="0d15534535c7f9308c9daa2cceff29e7" args="" -->
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<td class="memname">double * <a class="el" href="structwcsprm.html#0d15534535c7f9308c9daa2cceff29e7">wcsprm::m_crder</a> </td>
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<p>
(For internal use only.)
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<a class="anchor" name="13fab263ca03f35844fdaca289b7dfac"></a><!-- doxytag: member="wcsprm::m_csyer" ref="13fab263ca03f35844fdaca289b7dfac" args="" -->
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<td class="memname">double * <a class="el" href="structwcsprm.html#13fab263ca03f35844fdaca289b7dfac">wcsprm::m_csyer</a> </td>
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(For internal use only.)
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<a class="anchor" name="e09d5bf005e3bd7ee880353e8816ceb8"></a><!-- doxytag: member="wcsprm::m_tab" ref="e09d5bf005e3bd7ee880353e8816ceb8" args="" -->
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<td class="memname">struct <a class="el" href="structtabprm.html">tabprm</a> * <a class="el" href="structwcsprm.html#e09d5bf005e3bd7ee880353e8816ceb8">wcsprm::m_tab</a><code> [read]</code> </td>
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(For internal use only.)
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<a class="anchor" name="ce7e0986c79d73bd3a0613034b71974f"></a><!-- doxytag: member="wcsprm::m_wtb" ref="ce7e0986c79d73bd3a0613034b71974f" args="" -->
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<td class="memname">struct <a class="el" href="structwtbarr.html">wtbarr</a> * <a class="el" href="structwcsprm.html#ce7e0986c79d73bd3a0613034b71974f">wcsprm::m_wtb</a><code> [read]</code> </td>
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(For internal use only.)
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<hr size="1"><address style="text-align: right;"><small>Generated on Tue Oct 4 19:02:31 2011 for WCSLIB 4.8.2 by
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