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<h3><a name="secB.36.2">B.36.2 Examples</a></h3>
<p>Here are some examples of using <code>tskymap</code>:
<dl>
<dt><strong><pre>
stilts tskymap in=iras_psc.fits lon=RA lat=DEC out=iras_map.csv
</pre></strong></dt>
<dd>Writes a table representing a density map of IRAS point sources
on the sky. The output is a 2-column CSV file: the first column is
pixel index, and the second column is the number of rows in the
input table whose (RA,DEC) positions fall within that pixel.
The default tiling is used (currently level 5 HEALPix, which has
12288 pixels).
</dd>
<dt><strong><pre>
stilts tskymap in=2mpz.fits icmd='addskycoords fk5 galactic ra dec glon glat'
lon=glon lat=glat tiling=hpx6
cols='jCorr-hCorr hCorr-kCorr jCorr-kCorr' combine=median
count=false
complete=true
out=2mpzColors.fits
</pre></strong></dt>
<dd>Writes a table with columns giving median J-H, H-K and J-K colours,
but no source count column, from the sources in the file 2mpz.fits,
aggregated over each tile of a level 6 HEALPix grid.
The input table has equatorial coordinates,
but the <code>addskycoords</code> filter has been used so that the grid
is laid on the sky with galactic coordinates.
Setting <code>complete=true</code> guarantees that a row is written
to the output file for every sky pixel, including empty ones.
</dd>
<dt><strong><pre>
stilts tskymap in=gums_lmc.fits lon=alpha lat=delta
tiling=hpx14 complete=false omode=count
</pre></strong></dt>
<dd>This prepares a source count map at healpix level 14
(3 billion pixels) from the given input table.
Since <code>complete=false</code>, only rows for non-empty pixels
are included in the output table. Then, since the output mode is
<code>count</code>, these rows are just counted, discarding the
pixels themselves, giving the number of level-14 healpix pixels
touched by the sources in this input file.
Note this is not necessarily the most efficient way to caluclate
coverage information.
</dd>
</dl>
</p>
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<b>Previous: </b><a href="tskymap-usage.html">Usage</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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