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Sky Matching of Elliptical Regions</a><br>
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<h4><a name="SphericalPolarMatchEngine">7.1.4 <code>sky3d</code>: Spherical Polar Matching</a></h4>
<p><pre>matcher=sky3d values*='<ra/degrees> <dec/degrees> <distance>'
params='<error/units of distance>'
tuning='<bin-factor>'</pre>
<blockquote>
<dl>
<dt><strong><code>values*</code>:</strong></dt>
<dd>
<ul>
<li><code>ra/degrees</code>: Right Ascension
</li>
<li><code>dec/degrees</code>: Declination
</li>
<li><code>distance</code>: Distance from origin
</li>
</ul>
</dd>
<dt><strong><code>params</code>:</strong></dt>
<dd>
<ul>
<li><code>error/units of distance</code>: Maximum Cartesian separation for match
</li>
</ul>
</dd>
<dt><strong><code>tuning</code>:</strong></dt>
<dd>
<ul>
<li><code>bin-factor</code>: Scaling factor to adjust bin size; larger values mean larger bins
</li>
</ul>
</dd>
</dl>
</blockquote>
</p>
<p>The <code>sky3d</code> matcher compares positions in the volume of
the sky taking account of distance from the observer.
The position in three-dimensional space is calculated for each
row using the <code>ra</code>, <code>dec</code> and <code>distance</code>
as spherical polar coordinates, where <code>distance</code> is the
distance from the observer along the line of sight.
Rows are considered to match when their positions in this space are
within <code>error</code> units of each other.
The units of <code>error</code> are the same as those of
<code>distance</code>.
</p>
<p>As with <a href="SkyMatchEngine.html"><code>sky</code></a> matching,
other longitude/latitude coordinate pairs may be used in place of
right ascension and declination.
</p>
<hr><a href="EqualsMatchEngine.html">Next</a> <a href="EllipseSkyMatchEngine.html">Previous</a> <a href="MatchEngine.html">Up</a> <a href="index.html">Contents</a> <br> <b>Next: </b><a href="EqualsMatchEngine.html">exact: Exact Matching</a><br>
<b>Up: </b><a href="MatchEngine.html">Match Criteria</a><br>
<b>Previous: </b><a href="EllipseSkyMatchEngine.html">skyellipse:
Sky Matching of Elliptical Regions</a><br>
<hr><i>STILTS - Starlink Tables Infrastructure Library Tool Set<br>Starlink User Note256<br>STILTS web page:
<a href="http://www.starlink.ac.uk/stilts/">http://www.starlink.ac.uk/stilts/</a><br>Author email:
<a href="mailto:m.b.taylor@bristol.ac.uk">m.b.taylor@bristol.ac.uk</a><br>Mailing list:
<a href="mailto:topcat-user@jiscmail.ac.uk">topcat-user@jiscmail.ac.uk</a><br></i></body>
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