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<div class="section" id="astropy-wcs-history">
<h1>astropy.wcs History<a class="headerlink" href="#astropy-wcs-history" title="Permalink to this headline">¶</a></h1>
<p><a class="reference internal" href="index.html#module-astropy.wcs" title="astropy.wcs"><tt class="xref py py-obj docutils literal"><span class="pre">astropy.wcs</span></tt></a> began life as <tt class="xref py py-obj docutils literal"><span class="pre">pywcs</span></tt>. Earlier version numbers refer to
that package.</p>
<div class="section" id="pywcs-version-1-11">
<h2>pywcs Version 1.11<a class="headerlink" href="#pywcs-version-1-11" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Updated to wcslib version 4.8, which gives much more detailed error
messages.</li>
<li>Added functions get_pc() and get_cdelt(). These provide a way to
always get the canonical representation of the linear transformation
matrix, whether the header specified it in PC, CD or CROTA form.</li>
<li>Long-running process will now release the Python GIL to better
support Python multithreading.</li>
<li>The dimensions of the <a class="reference internal" href="../_generated/astropy.wcs.Wcsprm.html#astropy.wcs.Wcsprm.cd" title="astropy.wcs.Wcsprm.cd"><tt class="xref py py-obj docutils literal"><span class="pre">cd</span></tt></a> and
<a class="reference internal" href="../_generated/astropy.wcs.Wcsprm.html#astropy.wcs.Wcsprm.pc" title="astropy.wcs.Wcsprm.pc"><tt class="xref py py-obj docutils literal"><span class="pre">pc</span></tt></a> matrices were always returned as 2x2. They
now are sized according to naxis.</li>
<li>Supports Python 3.x</li>
<li>Builds on Microsoft Windows without severely patching wcslib.</li>
<li>Lots of new unit tests</li>
<li><tt class="xref py py-obj docutils literal"><span class="pre">pywcs</span></tt> will now run without <tt class="xref py py-obj docutils literal"><span class="pre">pyfits</span></tt>, though the SIP and distortion
lookup table functionality is unavailable.</li>
<li>Setting <a class="reference internal" href="../_generated/astropy.wcs.Wcsprm.html#astropy.wcs.Wcsprm.cunit" title="astropy.wcs.Wcsprm.cunit"><tt class="xref py py-obj docutils literal"><span class="pre">cunit</span></tt></a> will now verify that the values
are valid unit strings.</li>
</ul>
</div>
<div class="section" id="pywcs-version-1-10">
<h2>pywcs Version 1.10<a class="headerlink" href="#pywcs-version-1-10" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Adds a <tt class="xref py py-obj docutils literal"><span class="pre">UnitConversion</span></tt> class, which gives access to wcslib’s unit
conversion functionality. Given two convertible unit strings, pywcs
can convert arrays of values from one to the other.</li>
<li>Now uses wcslib 4.7</li>
<li>Changes to some wcs values would not always calculate secondary values.</li>
</ul>
</div>
<div class="section" id="pywcs-version-1-9">
<h2>pywcs Version 1.9<a class="headerlink" href="#pywcs-version-1-9" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">Support binary image arrays and pixel list format WCS by presenting
a way to call wcslib’s <tt class="xref py py-obj docutils literal"><span class="pre">wcsbth()</span></tt></p>
</li>
<li><p class="first">Updated underlying wcslib to version 4.5, which fixes the following:</p>
<blockquote>
<div><ul class="simple">
<li>Fixed the interpretation of VELREF when translating
AIPS-convention spectral types. Such translation is now handled
by a new special- purpose function, spcaips(). The wcsprm
struct has been augmented with an entry for velref which is
filled by wcspih() and wcsbth(). Previously, selection by
VELREF of the radio or optical velocity convention for type VELO
was not properly handled.</li>
</ul>
</div></blockquote>
</li>
</ul>
<div class="section" id="bugs">
<h3>Bugs<a class="headerlink" href="#bugs" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li>The <a class="reference internal" href="../_generated/astropy.wcs.Wcsprm.html#astropy.wcs.Wcsprm.pc" title="astropy.wcs.Wcsprm.pc"><tt class="xref py py-obj docutils literal"><span class="pre">pc</span></tt></a> member is now available with a default
raw <a class="reference internal" href="../_generated/astropy.wcs.Wcsprm.html#astropy.wcs.Wcsprm" title="astropy.wcs.Wcsprm"><tt class="xref py py-obj docutils literal"><span class="pre">Wcsprm</span></tt></a> object.</li>
<li>Make properties that return arrays read-only, since modifying a
(mutable) array could result in secondary values not being
recomputed based on those changes.</li>
<li><tt class="xref py py-obj docutils literal"><span class="pre">float</span></tt> properties can now be set using <tt class="xref py py-obj docutils literal"><span class="pre">int</span></tt> values</li>
</ul>
</div>
</div>
<div class="section" id="pywcs-version-1-3a1">
<h2>pywcs Version 1.3a1<a class="headerlink" href="#pywcs-version-1-3a1" title="Permalink to this headline">¶</a></h2>
<p>Earlier versions of pywcs had two versions of every conversion method:</p>
<div class="highlight-python"><pre>X(...) -- treats the origin of pixel coordinates at (0, 0)
X_fits(...) -- treats the origin of pixel coordinates at (1, 1)</pre>
</div>
<p>From version 1.3 onwards, there is only one method for each
conversion, with an ‘origin’ argument:</p>
<blockquote>
<div><ul class="simple">
<li>0: places the origin at (0, 0), which is the C/Numpy convention.</li>
<li>1: places the origin at (1, 1), which is the Fortran/FITS
convention.</li>
</ul>
</div></blockquote>
</div>
</div>
</div>
</div>
</div>
<div class="sphinxsidebar">
<div class="sphinxsidebarwrapper"><h3>Page Contents</h3>
<ul>
<li><a class="reference internal" href="#">astropy.wcs History</a><ul>
<li><a class="reference internal" href="#pywcs-version-1-11">pywcs Version 1.11</a></li>
<li><a class="reference internal" href="#pywcs-version-1-10">pywcs Version 1.10</a></li>
<li><a class="reference internal" href="#pywcs-version-1-9">pywcs Version 1.9</a><ul>
<li><a class="reference internal" href="#bugs">Bugs</a></li>
</ul>
</li>
<li><a class="reference internal" href="#pywcs-version-1-3a1">pywcs Version 1.3a1</a></li>
</ul>
</li>
</ul>
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