An Interface to On-line Archive  Science Information Services Oasis provides access to data from many sources, including IRSA NED CDS STScI LLNL NRAO AAVSO HEASARC JPL Client GIS functionality allows fusion multiple datasets simultaneously. A general mechanism allows easy extension with other third-party data.

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OasisLink Tutorial

If you have images, source lists, etc. that you keep on-line, your users can visualize them directly OasisLink. For example, suppose you have an image orion.fits that you wish to display. You could simply create a link to it on some web page which would tell your browser to retrieve the file:

<a href="http://myserver.edu/orion.fits">Orion</a>

If the browser has been told which application can handle this file, it will start that application; otherwise, it will simply download the file to disk.

To open the file in Oasis, we use an extra level of indirection where the reference is handed off to OASIS (which is started automatically by the Browser if necessary), and OASIS retreives the data and adds it to the current display. In this way, a whole data collection (image, catalog overlays, contours, etc.) can be fused in a single client instance of OASIS even if the data all come from different locations.

For example, the above link can be converted to an Oasis link by sending the existing URL to the Oasis service:

<a href="http://irsa.ipac.caltech.edu/cgi-bin/OasisLink/nph-oasislink?
   ref=http://myserver.edu/orion.fits">Orion</a>

The line break after the question mark has been added for clarity. A file:// construct can also be used if you want to work with local data.

For more information on using OasisLink, and on other methods of using Oasis with your on-line datasets, see the help section on OasisLink.