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<title>Locating Cone Query Service URLs</title>
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Crossmatches table on sky position against remote cone service</a><br>
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<hr>
<h3><a name="coneService">B.3.3 Locating Cone Query Service URLs</a></h3>
<p>To use the <code>coneskymatch</code> command you need the
<b>service URL</b> (also known as the <b>base URL</b>
or <b>access URL</b>) of a cone search, SIA or SSA service to use.
If you know one of these representing a service that you wish to use,
you can use it directly.
</p>
<p>If you don't, you will need to find the URL from somewhere.
It is the job of the Virtual Observatory <b>Registry</b>
to keep a record of where you can find various astronomical services,
so this is where you should look.
</p>
<p>There are various ways you can interrogate the registry; the
easiest is probably to use a graphical registry search tool.
One such tool is
<a href="http://www.astrogrid.org/">AstroGrid</a>'s
<b>VOExplorer</b>, which allows you to perform sophisticated searches
for cone search, SIA or SSA services.
Another option is to use
<a href="http://www.starlink.ac.uk/topcat/">TOPCAT</a>;
the
<a href="http://www.starlink.ac.uk/topcat/sun253/ConeSearchDialog.html">Cone Search</a>,
<a href="http://www.starlink.ac.uk/topcat/sun253/SiapTableLoadDialog.html">SIA</a> and
<a href="http://www.starlink.ac.uk/topcat/sun253/SsapTableLoadDialog.html">SSA</a>
load dialogues allow you to search the registry for these services
prior to performing a query;
you can just use the registry part and cut'n'paste the URL which
is shown.
</p>
<p>Other registry querying tools are available, including STILTS's
<a href="regquery.html"><code>regquery</code></a>
command. See that section of the manual for details, but for
instance to locate registered Cone Search services which have
something to do with SDSS data, you could execute the following:
<pre>
stilts regquery query="capability/@standardID = 'ivo://ivoa.net/std/ConeSearch' and title like '%SDSS%'" \
ocmd="keepcols 'shortName AccessUrl'" \
ofmt=ascii
</pre>
Writing just
<code>query="capability/@standardID = 'ivo://ivoa.net/std/ConeSearch'"</code>
with no further qualification would give you <em>all</em>
registered cone search services.
</p>
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<b>Up: </b><a href="coneskymatch.html">coneskymatch:
Crossmatches table on sky position against remote cone service</a><br>
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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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