Use case analysis for handling data cubes in VO

[Doug Tody]

Discussions of how to handle regularly sampled 3D data have been ongoing.
At this stage most of this has been offline in smaller discussions, mainly
with projects having relevant 3D data which they wish to publish to the VO.
This has developed into a very interesting and productive investigation
with important implications for VO data access in general, not just cube
data, due mainly to the sophisticated data analysis use cases involved.
The intent of this posting is to summarize these discussions and bring
everyone up to date, while inviting broader comment.

To this point, S. Gibson (Arecibo, GALFA), M. Kissler-Patig (ESO,
SINFONI), R. Taylor (U.Calgary, CGPS), M. Marquarding (SGPS), F. Bonnarel,
M. Dolensky, A. Richards, A. Rots, R. Williams, and others have contributed
to these discussions.

Attached is a rough draft of an IVOA Note summarizing the results thus
far of this analysis.  The PDF for the document is not large so I just
attached it directly, but if necessary you can find a copy online at

     http://www.aoc.nrao.edu/~dtody/sia/3D-use-cases.pdf

It would be good to have some broader discussion of this before we proceed
further or publish an actual Note.  In particular, a proposal for a generic
dataset query service is described, which would significantly expand the
data discovery capabilities of DAL.     - Doug
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