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<section id="axis-swap">
<span id="axisswap"></span><h1>Axis swap<a class="headerlink" href="#axis-swap" title="Permalink to this headline">¶</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 5.0.0.</span></p>
</div>
<p>Change the order and sign of 2,3 or 4 axes.</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 27%" />
<col style="width: 73%" />
</colgroup>
<tbody>
<tr class="row-odd"><td><p><strong>Alias</strong></p></td>
<td><p>axisswap</p></td>
</tr>
<tr class="row-even"><td><p><strong>Domain</strong></p></td>
<td><p>2D, 3D or 4D</p></td>
</tr>
<tr class="row-odd"><td><p><strong>Input type</strong></p></td>
<td><p>Any</p></td>
</tr>
<tr class="row-even"><td><p><strong>Output type</strong></p></td>
<td><p>Any</p></td>
</tr>
</tbody>
</table>
<p>Each of the possible four axes are numbered with 1–4, such that the first input axis
is 1, the second is 2 and so on. The output ordering is controlled by a list of the
input axes re-ordered to the new mapping.</p>
<section id="usage">
<h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
<p>Reversing the order of the axes:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>+proj=axisswap +order=4,3,2,1
</pre></div>
</div>
<p>Swapping the first two axes (x and y):</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>+proj=axisswap +order=2,1,3,4
</pre></div>
</div>
<p>The direction, or sign, of an axis can be changed by adding a minus in
front of the axis-number:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>+proj=axisswap +order=1,-2,3,4
</pre></div>
</div>
<p>It is only necessary to specify the axes that are affected by the swap
operation:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>+proj=axisswap +order=2,1
</pre></div>
</div>
</section>
<section id="parameters">
<h2>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-arg-order">
<span class="sig-name descname"><span class="pre">+order</span></span><span class="sig-prename descclassname"><span class="pre">=<list></span></span><a class="headerlink" href="#cmdoption-arg-order" title="Permalink to this definition">¶</a></dt>
<dd><p>Ordered comma-separated list of axis, e.g. <em>+order=2,1,3,4</em>.
Adding a minus in front of an axis number results in a change of direction
for that axis, e.g. southward instead of northward.</p>
<p><em>Required.</em></p>
</dd></dl>
</section>
</section>
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