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<h1>TSR 2012-01: Distortion Correction in HST FITS Files<a class="headerlink" href="#tsr-2012-01-distortion-correction-in-hst-fits-files" title="Permalink to this headline">ΒΆ</a></h1>
<p><b>Author:</b> Warren Hack, Nadezhda Dencheva, Andy Fruchter, Perry Greenfield</p><p><b>Date:</b> 31 Oct 2012</p><div class="admonition abstract">
<p class="first admonition-title">Abstract</p>
<p class="last">A convention for storing distortion information in HST images was developed
and implemented in two software packages - PyWCS and STWCS. These changes
allow the development of a WCS based version of Multidrizzle, released
now as AstroDrizzle, and image alignment software, released as tweakreg.
The distribution of WCS solutions is discussed.</p>
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<p>Contents:</p>
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<ul>
<li class="toctree-l1"><a class="reference internal" href="fits_conventions.html">Introduction</a></li>
<li class="toctree-l1"><a class="reference internal" href="problems.html">Problems Introduced by the HST/ACS Distortion</a></li>
<li class="toctree-l1"><a class="reference internal" href="sip.html">SIP Convention</a><ul>
<li class="toctree-l2"><a class="reference internal" href="sip.html#velocity-aberration-correction">Velocity Aberration Correction</a></li>
<li class="toctree-l2"><a class="reference internal" href="sip.html#time-dependent-distortion">Time-Dependent Distortion</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="convention.html">FITS Distortion Proposal</a></li>
<li class="toctree-l1"><a class="reference internal" href="npolcorr.html">Non-polynomial Residual Correction</a><ul>
<li class="toctree-l2"><a class="reference internal" href="npolcorr.html#npolfile-reference-file-format">NPOLFILE reference File Format</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="d2imcorr.html">Detector To Image Correction</a><ul>
<li class="toctree-l2"><a class="reference internal" href="d2imcorr.html#detector-to-image-reference-file">Detector To Image Reference File</a></li>
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<li class="toctree-l1"><a class="reference internal" href="merging.html">Merging Of The Conventions</a></li>
<li class="toctree-l1"><a class="reference internal" href="updating.html">Updating the FITS File</a><ul>
<li class="toctree-l2"><a class="reference internal" href="updating.html#creating-the-d2imarr-extension">Creating the D2IMARR extension</a></li>
<li class="toctree-l2"><a class="reference internal" href="updating.html#creating-the-wcsdvarr-extension">Creating the WCSDVARR Extension</a></li>
</ul>
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<li class="toctree-l1"><a class="reference internal" href="summary.html">Summary</a></li>
<li class="toctree-l1"><a class="reference internal" href="appendix1.html">Appendix 1 - Sample ACS/WFC Image</a><ul>
<li class="toctree-l2"><a class="reference internal" href="appendix1.html#fits-file-extensions">FITS File extensions</a></li>
<li class="toctree-l2"><a class="reference internal" href="appendix1.html#primary-header">Primary Header</a></li>
<li class="toctree-l2"><a class="reference internal" href="appendix1.html#sci-header-keywords">SCI Header Keywords</a></li>
<li class="toctree-l2"><a class="reference internal" href="appendix1.html#d2imarr-header">D2IMARR Header</a></li>
<li class="toctree-l2"><a class="reference internal" href="appendix1.html#wcsdvarr-header">WCSDVARR Header</a></li>
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<li class="toctree-l1"><a class="reference internal" href="appendix2.html">Appendix 2 - NPOLFILE Example</a><ul>
<li class="toctree-l2"><a class="reference internal" href="appendix2.html#fits-file-extensions">FITS File Extensions</a></li>
<li class="toctree-l2"><a class="reference internal" href="appendix2.html#primary-header">Primary Header</a></li>
<li class="toctree-l2"><a class="reference internal" href="appendix2.html#data-extension-header">Data Extension Header</a></li>
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<li class="toctree-l1"><a class="reference internal" href="appendix3.html">Appendix 3 - D2IMFILE Example</a><ul>
<li class="toctree-l2"><a class="reference internal" href="appendix3.html#fits-file-extensions">FITS File Extensions</a></li>
<li class="toctree-l2"><a class="reference internal" href="appendix3.html#primary-header">PRIMARY Header</a></li>
<li class="toctree-l2"><a class="reference internal" href="appendix3.html#data-extension-header">Data Extension Header</a></li>
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