On Wed, 2 May 2007, Peter W. Draper wrote:
> On Tue, 1 May 2007, Tim Jenness wrote:
>
>> On Wed, 2 May 2007, David Berry wrote:
>>
>>> On 01/05/07, Tim Jenness <[log in to unmask]> wrote:
>>>> can this be done with starlink software?
>>>
>>> If you mean, given a set of 1D spectra and a 2D image, can we mark the
>>> positions of the spectra on the image, then I don't know of any direct
>>> way to do it in kappa at the moment.
>>> We could no doubt write something that looked at a set of 1D spectra
>>> and produced an output catalogue containing their sky reference
>>> positions. Then we could use listshow to mark the positions on top of
>>> the image.
>>>
>>
>> I think that we wouldn't get any "coolness" points for using kappa, so
>> SPLAT, GAIA and TOPCAT would be the only tools in town.
>
> I think the missing functionality here is the ability to send an SSAP
> query result table from SPLAT to GAIA. If that was done it would be
> possible to plot the spectral positions over say an image.
>
> It's sort of possible now. Do an SSAP query in SPLAT and save the results
> table out to a VOTable. Open that in TOPCAT using the hierarchy browser to
> pick out one of the query results (the response from a single server), now
> use PLASTIC to send that to GAIA. Note this all assumes the response has
> RA and Dec columns, not sure if those are a required part of the response.
It sounds like the specific problem that Anita has is that (some of)
the SSAP responses she was getting had encoded RA and Dec columns
as String values rather than floating point ones. So this is a
standards (or implementation of standards) problem at the server end.
But as Peter says, you can achieve the desired effect using SPLAT,
TOPCAT & GAIA with a little bit of effort.
Mark
--
Mark Taylor Astronomical Programmer Physics, Bristol University, UK
[log in to unmask] +44-117-928-8776 http://www.star.bris.ac.uk/~mbt/
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