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map-spectra
map-spectra calculates the mapping between science plane (wavelength
and slit coordinate) and CCD focal plane for a given observation set.
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USAGE
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map-spectra observset
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INPUT
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observset.obsdef
name of an existing observation definition file
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OUTPUT
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observset.map
is a file with the mapping information
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PARAMETERS
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minlambda
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minimum wavelength
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maxlambda
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maximum wavelength
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minpixl
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minimum number of pixels of spectrum on a chip
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use_partial
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map partial slits
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use_holes
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map alignment holes as well as slits
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Details:
map-spectra first finds, for each slit, spectrum segments-
ranges of wavelength- that fall on each chip. Wavelengths at which the object
position along the slit is too close (a few pixels) to the chip edge are not
included. If <span style="font-size:11.0pt;font-family:"Courier New";
font-weight:normal">minpixl</span><span style="font-size:12.0pt;font-weight:
normal"> is set to a non-zero number, shorter segments are discarded. </span><span style="font-size:12.0pt">map-spectra</span><span style="font-size:12.0pt;
font-weight:normal"> does not map <i>partial</i> slits, those with an end which
falls off the edge of the CCD at any wavelength, unless </span><span style="font-size:11.0pt;font-family:"Courier New";font-weight:normal">use_partials</span><span style="font-size:12.0pt;font-weight:normal"> is set to </span><span style="font-size:11.0pt;font-family:"Courier New";font-weight:normal">“y”</span><span style="font-size:12.0pt;font-family:"Courier New";font-weight:normal">. </span><span style="font-size:12.0pt;font-weight:normal">If partial slits are mapped,
map-spectra finds the wavelength at which the smallest fraction of the slit is
on a ccd, and uses this length for the entire spectrum. Slits that are not
mapped, and partial slits that are mapped, are reported when the program exits.
You must set <code><span style="font-family:"Times New Roman",serif">use_holes</span></code>
to "y" if you intend to use the alignment stars during the extraction
in </span><span style="font-size:12.0pt;font-weight:normal">extract-2dspec</span><span style="font-size:12.0pt;font-weight:normal">.</span> </h3>
<h3 style="margin-left:.5in;text-indent:-.25in"><span style="font-size:12.0pt;
font-family:Symbol;font-weight:normal">·<span style="font:7.0pt "Times New Roman"">
</span></span><span style="font-size:12.0pt;font-weight:normal">partial slits
may require special handling in later steps of the reduction. See the
documentation of </span><span style="font-size:12.0pt">adjust-map</span><span style="font-size:12.0pt;font-weight:normal"> and the COSMOS Cookbook for
details. </span></h3>
<h3 style="margin-left:.5in;text-indent:-.25in"><span style="font-size:12.0pt;
font-family:Symbol;font-weight:normal">·<span style="font:7.0pt "Times New Roman"">
</span></span><span style="font-size:12.0pt">map-spectra</span><span style="font-size:12.0pt;font-weight:normal"> may not handle slits that are
longer than the width of a ccd chip.</span></h3>
<p class="MsoNormal"> </p>
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