cscatalog - Tool

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tool for VO conesearch queries

Description
cscatalog is an tool that facilitates queries to VO conesearch services related to specific catalogs. Currently supported are NVSS, FIRST, and WENSS The services used are hosted by NRAO. The services may be tried by hand at http://www.aoc.nrao.edu/e2e/java/vocone.html

In the following example, the NVSS catalog is queried for all sources overlapping the given image. cscatalog.queryimage returns a componentlist tool that may be used in imager or converted to a skycatalog for display overlaid on an image.

#
# Make an image tool
#
include 'image.g';
im:=image('C1200M24.sub');
# 
# Make a conesearch catalog. This will return a componentlist
#
include 'cscatalog.g';
cs:=cscatalog();
cl:=cs.queryimage(im, 'NVSS');
if(is_fail(cl)) fail;
cs.done();
#
# Skycatalog is a simple format for displaying catalogs
#
include 'skycatalog.g'
sc:=skycatalog(spaste(im.name(), '.sc'));
sc.fromcomponentlist(cl);
if(is_fail(sc)) fail;
#
# Now the image and the skycatalog should be visible in the viewer
#
include 'viewer.g';
dv.gui();

In this example, we have queried for an NVSS image (actually a subsection). The result (after using the viewer to load the image and the skycatalog) is shown in the figure below:

Constructors

cscatalog

Construct an cscatalog tool

Functions

done	Delete the tool
querydirection	Query a catalog for a direction return a componentlist
queryimage	Query a catalog for an image

Next: cscatalog - Constructor Up: conesearch - Module Previous: conesearch.done - Function Contents Index

	Package	vo
	Module	conesearch