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<h1>Source code for astropy.wcs</h1><div class="highlight"><pre>
<span class="c"># Licensed under a 3-clause BSD style license - see LICENSE.rst</span>
<span class="sd">"""</span>
<span class="sd">.. _wcslib: http://www.atnf.csiro.au/~mcalabre/WCS/</span>
<span class="sd">.. _Paper IV: http://www.atnf.csiro.au/people/mcalabre/WCS/index.html</span>
<span class="sd">.. _SIP: http://irsa.ipac.caltech.edu/data/SPITZER/docs/files/spitzer/shupeADASS.pdf</span>
<span class="sd">.. _ds9: http://hea-www.harvard.edu/RD/ds9/</span>
<span class="sd">Introduction</span>
<span class="sd">------------</span>
<span class="sd">`astropy.wcs` contains utilities for managing World Coordinate System</span>
<span class="sd">(WCS) transformations in FITS files. These transformations map the</span>
<span class="sd">pixel locations in an image to their real-world units, such as their</span>
<span class="sd">position on the sky sphere.</span>
<span class="sd">It is at its base a wrapper around Mark Calabretta's `wcslib`_, but</span>
<span class="sd">also adds support for the Simple Imaging Polynomial (`SIP`_)</span>
<span class="sd">convention and table lookup distortions as defined in WCS `Paper IV`_.</span>
<span class="sd">Each of these transformations can be used independently or together in</span>
<span class="sd">a standard pipeline.</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">division</span> <span class="c"># confidence high</span>
<span class="k">try</span><span class="p">:</span>
<span class="c"># Not guaranteed available at setup time</span>
<span class="kn">from</span> <span class="nn">.wcs</span> <span class="kn">import</span> <span class="o">*</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">_ASTROPY_SETUP_</span><span class="p">:</span>
<span class="k">raise</span>
</pre></div>
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