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<title>tskymap: Calculates sky density maps</title>
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<h2><a name="tskymap">B.36 <code>tskymap</code>: Calculates sky density maps</a></h2>
<p><code>tskymap</code> calculates a weighted density map
(or, to put it another way, a histogram) on the sky
from columns of an input table.
The sky is divided up into some discrete set of tiles according to
a specified tessellation scheme (currently HEALPix or HTM are supported),
and the required quantities are aggregated into bins corresponding to
these tiles.
The output table has a column giving the pixel index identifying each tile,
plus one or more columns each representing an aggregation of a quantity
from the input table.
</p>
<p>By default the number of rows from the input table falling within
each tile is included as the first column in the output table.
But by specifying the <code>cols</code> and <code>combine</code> parameters
you can add more columns giving the sum, mean, median or other statistics
of input table columns or expressions as well.
</p>
<p>The output table can then, for instance, be plotted using
<a href="plot2sky.html"><code>plot2sky</code></a>'s
<a href="layer-healpix.html"><code>healpix</code></a> layer type
(though an alternative is to do that plot directly using a
<a href="layer-skydensity.html"><code>skydensity</code></a> layer).
</p>
<ul>
<li><a href="tskymap-usage.html">B.36.1 Usage</a></li>
<li><a href="secB.36.2.html">B.36.2 Examples</a></li>
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<b>Previous: </b><a href="tpipeExamples.html">Examples</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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