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<h2><a name="tskymatch2">B.37 <code>tskymatch2</code>: Crossmatches 2 tables on sky position</a></h2>
<p><code>tskymatch2</code> performs a crossmatch of two tables based
on the proximity of sky positions.
You specify the columns or expressions giving
right ascension and declination in degrees for each input table,
and a maximum permissible separation in arcseconds, and the resulting
joined table is output.
</p>
<p>If you omit expressions for the RA and Dec, an attempt is made to
identify the columns to use using column
Unified Content Descriptors
(<a href="http://www.ivoa.net/Documents/latest/UCD.html">UCD</a>s)
or names. First columns bearing appropriate UCD1 or UCD1+ values
(<code>POS_EQ_RA</code>, <code>POS_EQ_RA_MAIN</code>,
<code>pos.eq.ra</code> or <code>pos.eq.ra;meta.main</code> and
their equivalents for declination) are sought. If these cannot be found,
columns named something like "RA" or "RA2000" are sought.
If either is found, the column units are consulted and radian->degree
conversions are performed if necessary (degrees are assumed if no
unit value is given). If nothing likely can be found, then the
command will fail with an error message.
This search logic is intended as a convenience only; it is somewhat
ad hoc and subject to change. To make sure that the correct
angle values are being used, specify the <code>ra</code> and <code>dec</code>
position parameters explicitly.
</p>
<p><code>tskymatch2</code> is simply a cut-down version, provided for
convenience, of the more general matching task
<a href="tmatch2.html"><code>tmatch2</code></a>.
If you want more match options or otherwise more configurability,
you can probably find it by using <code>tmatch2</code>.
</p>
<ul>
<li><a href="tskymatch2-usage.html">B.37.1 Usage</a></li>
<li><a href="secB.37.2.html">B.37.2 Examples</a></li>
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<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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