wcslib (8.2.2)
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<div id="projectname">WCSLIB<span id="projectnumber"> 8.2.2</span>
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<li class="navelem"><a class="el" href="index.html">WCSLIB 8.2.2 and PGSBOX 8.2.2</a></li> </ul>
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<div class="headertitle"><div class="title">Introduction</div></div>
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<div class="textblock"><p>WCSLIB is a C library, supplied with a full set of Fortran wrappers, that implements the "World Coordinate System" (WCS) standard in FITS (Flexible Image Transport System). It also includes a <a class="el" href="software.html">PGPLOT</a>-based routine, <a class="el" href="pgsbox.html">PGSBOX</a>, for drawing general curvilinear coordinate graticules, and also a number of utility programs.</p>
<p>The FITS data format is widely used within the international astronomical community, from the radio to gamma-ray regimes, for data interchange and archive, and also increasingly as an online format. It is described in</p>
<ul>
<li>"Definition of The Flexible Image Transport System (FITS)", FITS Standard, Version 3.0, 2008 July 10.</li>
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<p>available from the FITS Support Office at <a href="http://fits.gsfc.nasa.gov">http://fits.gsfc.nasa.gov</a>.</p>
<p>The FITS WCS standard is described in</p>
<ul>
<li>"Representations of world coordinates in FITS" (Paper I), Greisen, E.W., & Calabretta, M.R. 2002, A&A, 395, 1061-1075</li>
<li>"Representations of celestial coordinates in FITS" (Paper II), Calabretta, M.R., & Greisen, E.W. 2002, A&A, 395, 1077-1122</li>
<li>"Representations of spectral coordinates in FITS" (Paper III), Greisen, E.W., Calabretta, M.R., Valdes, F.G., & Allen, S.L. 2006, A&A, 446, 747</li>
<li>"Representations of distortions in FITS world coordinate systems", Calabretta, M.R. et al. (WCS Paper IV, draft dated 2004/04/22), available from <a href="http://www.atnf.csiro.au/people/Mark.Calabretta">http://www.atnf.csiro.au/people/Mark.Calabretta</a></li>
<li>"Mapping on the HEALPix Grid" (HPX, Paper V), Calabretta, M.R., & Roukema, B.F. 2007, MNRAS, 381, 865</li>
<li>"Representing the 'Butterfly' Projection in FITS: Projection Code XPH" (XPH, Paper VI), Calabretta, M.R., & Lowe, S.R. 2013, PASA, 30, e050</li>
<li>"Representations of time coordinates in FITS: Time and relative dimension in
space" (Paper VII), Rots, A.H., Bunclark, P.S., Calabretta, M.R., Allen, S.L., Manchester R.N., & Thompson, W.T. 2015, A&A, 574, A36</li>
</ul>
<p>Reprints of all published papers may be obtained from NASA's Astrophysics Data System (ADS), <a href="http://adsabs.harvard.edu/">http://adsabs.harvard.edu/</a>. Reprints of Papers I, II (including HPX & XPH), and III are available from <a href="http://www.atnf.csiro.au/people/Mark.Calabretta">http://www.atnf.csiro.au/people/Mark.Calabretta</a>. This site also includes errata and supplementary material for Papers I, II and III.</p>
<p>Additional information on all aspects of FITS and its various software implementations may be found at the FITS Support Office <a href="http://fits.gsfc.nasa.gov">http://fits.gsfc.nasa.gov</a>. </p>
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