SIAP and previews

[Anita Richards]

SIAP v1.0 looks very suitable forradio data including 'virtual' images
which are created on demand from visibility data.  However in Section  3.
"Image Service Types" I am not sure how to indicate that more than one of
the subgroups 1-4 might be available from a single archive. At present 4.
Pointed Image Archive states that if the archive also contains surveys
that should be registered separately.  Does this cover the situation where
you have e.g. virtual images available for a collection of 10' fields of
view, and 10" ready made images for the centre of each field? There might
be other situations where e.g. low-res images of a large field are
ready-made but high-res cut-outs or mosaic tiles are extracted on demand.
The ready-made images would often be much quicker to access but less
suitable for science.  A third instance is the preview jpegs provided by
Aladin.

Is there a need for a category 5. Preview or is this covered by 4.? - will
users realise that they might also be able to look for customised images?

cheers
a

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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).