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STARDEV  March 2005

STARDEV March 2005

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Subject:

Re: SIAP

From:

"Peter W. Draper" <[log in to unmask]>

Reply-To:

Starlink development <[log in to unmask]>

Date:

Thu, 31 Mar 2005 15:21:36 +0100

Content-Type:

TEXT/PLAIN

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TEXT/PLAIN (74 lines)

On Thu, 31 Mar 2005, Mark Taylor wrote:

> On Wed, 30 Mar 2005, Tim Jenness wrote:
>
> > CADC are very interested in an alternative to aladin for SIAP image
> > access. I was under the impression that SoG supported SIAP but now I can't
> > find any mention of it on the SoG web page (www.starlink.ac.uk/sog) so I'm
> > worrying that I oversold the Starlink software to CADC.
> >
> > Can someone clarify the SIAP support in starjava?
>
> Tim,
>
> I can't see any reference to SIAP in SoG either, but it might be
> there - I think Peter is back from holiday today so can clarify.

Hi Tim,

there is no SIAP support in SoG. We'd planned to add this generically as
Mark explains below (it may be that this will also provide the plumbing
for application-specific gateways, like that provided by SPLAT, but that's
in some later stage).

> It is actually possible to use TOPCAT v1.4 or later (+SoG) as a SIAP
> client:
>
>    1. Run 'topcat -siap' (the flag isn't strictly necessary but it
>       makes the SIAP option more prominent in the load dialogue).
>
>    2. From the load dialogue hit the 'SIAP Query' button
>
>    3. Select the SIAP service from those listed (the list is obtained
>       from a registry somewhere).
>
>    4. Enter the coordinates & radius of the region you're interested in.
>       This window doesn't currently have a name resolution box,
>       clearly it should.
>
>    5. Hit the OK button
>
>    6. TOPCAT will (attempt to) contact the server with the query you've
>       made and load in a table with the resulting available images
>
>    7. On the TOPCAT control window for the newly loaded table hit
>       the 'Activation Action' button and select 'Display Named Image'
>       in the resulting dialogue (the column selected for this purpose
>       should automatically be the column in the SIAP return table
>       which contains an image URL).  Hit OK on that dialogue.
>
>    8. View either a plot of the resulting table or the table data
>       viewer.  If you select one of the rows (click on a point in the
>       plot or a row in the table) then it will download the image
>       from the server and fire up SoG with the result.
>
> As you can see this is a bit of a hoo-hah.  Although reworking within
> TOPCAT could improve matters, what we concluded at the last programmers'
> meeting was that trying to get TOPCAT working as a SIAP client is
> probably going to result in both clunkifying of TOPCAT and a second-rate
> SIAP client, and it really needed a new application - this will be
> one of the things that VO{RTEX,GON} is for.  For this reason the
> SIAP functionality in TOPCAT isn't something I'm working on improving
> or have advertised much (it's not really documented in SUN/253).
>
> Although I'd still stand by my estimate of a couple of months work
> to get something worthwhile working for VORTEX, I haven't started
> work on it yet, and probably won't until after Kyoto (May) - after
> various bits of this and that I'm of the opinion that command-line
> table tools is probably a higher priority to get working.  But
> certainly I'd be interested in any definite requirements that CADC
> have for this, why they want alternatives to Aladin, what timescale
> their requirements have and so on.  If they're keen to have something
> soon which we can provide with a small amount of effort, as may be
> the case, I could maybe bring forward the start of the VORTEX work.

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