Collaboration on Source Catalogue DM, ADQL and SkyNodes

[Pedro Osuna]

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 - SPAIN
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