- Download and install the freely available TOPCAT.
- Start TOPCAT. On most systems this just involves double clicking the topcate JAR file.
- Select VO→Table Access Protocol (TAP) Query from the main menu.
- Copy and paste or type the following into TAP URL in the Selected TAP Service section
- Click Use Service
- You should now be taken to a new window which contains a list of available tables on the left and an ADQL Text box in the lower section.
- At this point you can type in ADQL queries and click Run Query to execute and return data.
- Each time you run a query a new entry will appear in another window TOPCAT creates.
- You can then view the data returned (use the View→Table Data menu option) or produce plots, etc via the Graphics menu.
- This is intended to be a quick start guide for using TOPCAT. It is a very powerful tool and you should review TOPCAT's full documentation to get the most out of it.
import pyvo as vo # Connect to the MWA TAP service mwa_tap_service = vo.dal.TAPService("http://vo.mwatelescope.org:8000/mwa_asvo/tap") # Execute a simple query results = mwa_tap_service.search("SELECT TOP 3 obs_id, obsname FROM mwa.observation WHERE mode = 'HW_LFILES'") # Print the results to the console print(results)
The MWA ASVO also provide an implementation of the simple cone search protocol. This is a quick search tool which will perform a coordindate search based on an RA, Dec and radius and provide a list of observations which match the criteria.
The most common use of the SCS is within a VO client, such as TOPCAT.