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<h3><img alt="" src="../sun.gif" height="98" align="middle" width=
"100"> Catalogs</h3>
<blockquote>
<p>DS9 provides full support for loading, displaying, filtering,
and saving catalogs. DS9 allows you to overlay symbols from
multiple catalogs on the current image.</p>
<p>Local and on-line catalog access is supported. Most major
catalogs can be retrieved from online servers. Both the CDS and
SDSS catalog servers are now supported. Local catalog files in
starbase (rdb) or CSV (with or without header) are supported.</p>
<p>On-line catalogs are available via services provided by the
VizieR catalog access tool, CDS, Strasbourg, France (VizieR is a
joint effort of the Centre de Donnees Astronomiques de Strasbourg
and ESA-ESRIN Information Systems Division) and by the Sloan
Digital Sky Survey.</p>
<p>A selection of popular catalogs is provided in the Analysis
menu. In addition, you can search for other catalogs based on
title, keywords, mission, wavelength, and object type.</p>
<p>When a catalog is overlayed on an image, each displayed catalog
symbol consists of a shape, color, and text. An advanced symbol
editor is available that allows you to specify the shape, size,
color, and text of each symbol, based on catalog column values.
These symbol expressions can be saved for future use.</p>
<p>Along with the overlay display, a catalog list is provided in a
separate window. It displays the column values for each catalog
object. The catalog list can be sorted and filtered, and the
catalog display will be automatically updated. Advanced filtering
options are available. Catalogs can be loaded and saved as local
files in ASCII Starbase format. Each catalog contains header
information which can be displayed. The list can be printed
separately from the image.</p>
<p>An interactive connection between the displayed catalog symbols
and the catalog list is provided. When you select one or more rows
within the catalog list, the corresponding symbols are highlighted
on the image display. Conversely, selecting multiple symbols on the
image display will highlight the corresponding rows within the
catalog list. Catalog symbols can be converted to regions for use
with analysis tasks.</p>
<p><b>Filter Option</b></p>
<p>The catalog list can be sorted and filtered, and the catalog
display will be automatically updated. A filter is conditional
expression, when evaluated for each row of the catalog, if true,
the row is displayed, and if false, the row is not displayed. The
conditional expression can be any valid TCL expression. The value
of a column may be indicated with <tt>$<column
name></tt>.</p>
<blockquote><tt>$_RAJ2000>180. &&
$_RAJ2000<270.</tt><br>
<tt>$Jmag>11</tt><br>
<tt>log($Kmag*10)<.3<br></tt> <tt>[string equal $OTYPE_S
SNR]</tt><br></blockquote>
<p><b>Advanced Symbol Editor</b></p>
<p>An advanced symbol editor is available that allows you to
specify the shape, size, color, and text of each symbol, based on
catalog column values. For each row of the catalog, one or more
conditional expressions are evaluated. For the first expression to
evaluate true, a given symbol is displayed, with the specified
shape, color, size and text properties. As with the filter, the
value of a particular column can be indicated as <tt>$<column
name>.</tt></p>
<p>For the condition entry, the expression you type in is
automatically evaluated via TCL <tt>expr</tt> after macro
expansion.</p>
<blockquote>
<tt>1 #
always</tt><br>
<tt>0 #
never</tt><br>
<tt>true #
always</tt><br>
<tt>false #
never</tt><br>
<tt>$Jmag>2 #
conditional</tt><br>
<tt>sin($Jmag)>.5
# conditional</tt><br>
<tt>[string equal $Class
SNR] #
conditional</tt><br>
<tt>[regexp {*SNR*}
$Class] #
conditional</tt><br></blockquote>
<p>For the size, size2, and angle entries, the expression you type
in is also automatically evaluated via TCL <tt>expr</tt> after
macro expansion.</p>
<blockquote>
<tt>2 #
value of '2' is used</tt><br>
<tt>$Jmag #
value of column Jmag is used</tt><br>
<tt>$Jmag/2. # value
of column Jmag div 2 is used</tt><br>
<tt>(4+2)/3 #
value of '2' is used</tt><br></blockquote>
<p>For the text portion, this is not true. It is assumed to be
text, unless you explicitly use an <tt>expr</tt> operator.</p>
<blockquote>
<tt>foo #
will put 'foo' above the symbol</tt><br>
<tt>$Jmag #
will put the value of column Jmag above the symbol</tt><br>
<tt>(4+2)/3 #
will put the text '(4+2)/3' above the symbol</tt><br>
<tt>[expr (4+2)/3] # will put the text '2' above the
symbol</tt><br>
<tt>[expr $Jmag/2.] # will take the value of Jmag and div by
2</tt><br></blockquote>
<p>And finally, one special case for shape = text and text = empty.
In this case, the row number is displayed.</p>
</blockquote>
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