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The motivation to build CAS (catalog access service)

  • To build any serious VO application working with the data (like cone search, skynode, just simple crossmatch) the system storing the catalogues and their metadata must be built.
  • Up To the moment there is no such catalog storing systems. But there are good examples like CASjobs and Openskyquery, but they are not public and with some disandavantages.

So the main idea is:

  • Build the system allowing to store almost any astronomical catalogue, put it in the system using simple API, get the data and metadata about it.
  • That system should allow to create the VO services on it, and build some external interfaces too.

Finally, we should say that creating of CAS is mainly preparation of the VO work, preparation to enable even such simple things like cone search based on Q3C.