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      <title>tskymatch2: Crossmatches 2 tables on sky position</title>
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      <hr>
      <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-&gt;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>
      </ul>
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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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