	Sloan Digital Sky Survey

JHU CAS WebServices clients

Java Clients for the SDSS Catalog Web Services

The Cas Web Service allows access to the SDSS Catalog Archive Server (aka. SkyServer). Queries may be submited and results are available in a variety of formats i.e :

FITS as dime Attachment - Sample java client
VOTable - Sample java client
CasResult (like VOTable but preserving native types) - Sample java client
DataSet (DOM Document) - Sample java client

Creating a java client

Using axis-1_1RC1 we created the set of client classes for using this service. This is very easy with axis you simply do

java org.apache.axis.wsdl.WSDL2Java http://skyservice.pha.jhu.edu/devel/CasService/CasService.asmx?wsdl

And you are done. (Okay you do need to have your class path set up properly to include the AXIS libs).
See also the ImgCutout page.

TRY IT

Here is a jar for download. You will need a JRE/JDK installed probably 1.3 or higher. This has been run/developed with JDK1.4 on linux.
You need to have AXIS installed also and in you CLASSPATH. To just run it download CasService.jar and put it in your CLASSPATH then type :

java edu.jhu.pha.FitsQuery myfits.fits "select top 100 ra,dec,u,g,r,i,z from GALAXY"

or to see immediate results on screen


java edu.jhu.pha.VOTQuery "select top 10 ra,dec,u,g,r,i,z from GALAXY"

Creating a Python client

THis client does not use a framework to create the SOAP requests and is more code than in Java.
cassoap is a very simple python program of two pages of code that makes a proper SOAP request to the GetStream() method of CasService. It uses a simple SAX parser to extract the returned columns and relays them to a file or stdout. If an error occurs the server throws a SOAP exception, which is caught by the client and written to the output file stream. Have a look at the code here or download it from here

William O'Mullane
Last Modified :Wednesday, August 6, 2003 at 2:41:59 PM , $Revision 1.1 $