SSAP and images

[Anita M. S. Richards]

Hi people,

Today we were doing a demo at the E-Science North West open day in 
Manchester and someone asked 'can you display the positions of spectra on 
top of images'.  So I used AstroScope to get some spectra and images and 
sent an image to Aladin, and sent the SSAP VOTable to Aladin and TopCat. 
Two problems emerged:

The position is given in decimal degrees but type is string.  If I change 
to float, TopCat will plot the positions.

However, even then, Aladin will only offer to display it in a spectral 
tool - it won't plot the positions.

Probably we ahve discussed this and there are good reasons for it not 
working? Or is it something to do with retrieving SSAP stuff via 
AstroScope? But otherwise, it seems easy to fix and would please users.

Thanks

Anita

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Dr. Anita M. S. Richards, AstroGrid 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).