UCD use cases

[Anita Richards]

Hi Roy,

Great to see something practical happening.  One comment - we do need to
see the use of UCDs alongside the use of the Registry and data models
(e.g. Pedro Osuna's very helpful reply which has indeed lifted my
confusion about non-table data - or that bit of it anyway).  Hence, when
people provide implimentation of use cases, it would be nice to see:

Where/if UCDs are used in the Registry to select data-sets (and if only
UCDs, not other entries e.g. spectral coverage, keywords, serve a
particular purpose);

How UCDs are used (ideally in the context of a data model) to enable the
processing steps in the execution of a query.

Use case - if you are sick of Brown Dwarfs read no further:
http://wiki.astrogrid.org/bin/view/Astrogrid/BrownDwarfRegistryRequirements

The RegistryQuery steps use some things which could be UCDs like Proper
Motion but they might also be key words.  Specific colours are also used,
but it might be sufficient to know that a catalogue contains optical and
colour data.

The DataSetQuery/Evaluation steps use these UCDs above and others.  The
new UCD structure enabling the use of partial matches would be a great
help as the workflow contains choices where you use a quantity (e.g.
colour) if already defined but if not you derive it ("you" being a data
processing software agent).

More examples could be drawn from the AstroGrid Ten...

cheers
a

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Dr. Anita M. S. Richards, AVO Astronomer
MERLIN/VLBI National Facility, University of Manchester,
Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.
tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax).