Hi Maria,
> - How does Catalogue Data Model used look like, especially what is the
> common set of attributes and the associated metadata.
The point is in the (Source) Catalogue Data Model, with emphasis in the "Source" part. This one is the one I showed on behalf of the Catalogue DM subgroup at our last interop meeting here at ESAC. I attach a pdf with the initial proposal, but please use it only for temporal reference, as the whole document will be changed (according to requirements from Jonathan after the interop meeting).
> - What are the plans about registration? Will these nodes (Basic?) be
> registered and therefore accessible through Open SkyQuery? How many?
yes, they will. How many, I don't know. In Strasbourg, Inaki and Aurelien worked on a couple of them, Tycho-2 and USNOB, but the CDS colleagues will work on more.... Francois will answer to this question at some point I presume.
> - The cross-match functionallity. Are you planning on a 2 catalog
>cross-match or n-catalog cross-match? How does the cross-match function
>look like?
n-catalogue cross-match is what we are trying to get at; it will be a client based cross-match, and therefore the cross-match function will be designed and run at the client side (i.e., servers do not need to worry about implementing one specific cross-match or the other). At the current status, the client sends an ADQL to the server to discern which type of cross-match it can do with it (whether only positional, positional with errors, etc.), and takes the corresponding action.
I hope this clarifies your questions. We wanted to let you all know even at this preliminary stage, to open fruitful interactions. We will get in touch in a near future with more details on how we are evolving.
Cheers,
P.
On Wed, 2005-12-21 at 05:13 -0500, Maria A. Nieto-Santisteban wrote:
> Hi,
>
> This is great news!
>
> There are three things I would be interested in knowing:
>
> - How does Catalogue Data Model used look like, especially what is the
> common set of attributes and the associated metadata.
>
> - What are the plans about registration? Will these nodes (Basic?) be
> registered and therefore accessible through Open SkyQuery? How many?
>
> - The cross-match functionallity. Are you planning on a 2 catalog
> cross-match or n-catalog cross-match? How does the cross-match function
> look like?
>
> Cheers
>
> Maria
>
> On Wed, 21 Dec 2005, Pedro Osuna wrote:
>
> > Dear all,
> >
> >
> > Within the Data Model and ADQL context, ESAVO has initiated a
> > collaboration with CDS in order to try to find a reference
> > implementation for the usage of the Source Catalogue Data Model
> > together with ADQL.
> >
> > The effort consists on setting up servers that understand ADQL on
> > Source Catalogue Data Model aware Basic SkyNodes.
> >
> > We have set up such servers for our ISO and XMM source catalogues here
> > at ESAC, and Inaki Ortiz and Aurelien Stebe have spent a week in
> > Strasbourg collaborating with our CDS colleagues, Andre Schaaf et al.,
> > in the building of such Basic SkyNodes for some of their catalogues.
> >
> > Once those servers are available, the idea is to use the Source
> > Catalogue Data Model aware server to implement a client-side cross-match
> > using ADQL, as a proof-of-concept of the validity or otherwise of the
> > model. ESAVO is developing a simple client to try the concept.
> >
> > Should you want more information on how we have done the translation
> > from the Catalogues to a Source DM aware Basic SkyNode, or on any of the
> > aforementioned subjects, please do not hesitate to ask.
> >
> > Best regards,
> > Pedro Osuna (ESAVO) and Francois Ochsenbein (CDS)
> >
>
-- Pedro Osuna Alcalaya ESA Science Archives System Engineer Science Archive Team European Space Astronomy Centre (ESAC/ESA) e-mail: Pedro.Osuna-at-esa.int Tel + 34 91 8131314 --------------------------------- European Space Astronomy Centre European Space Agency P.O. Box 50727 E-28080 Villafranca del Castillo MADRID - SPAINReceived on 2005-12-21Z11:57:12
- application/pdf attachment: IVOA_Catalogue_Data_Model.pdf