[ Re: Vocabularising dataproduct_type] an attempt for definitions for catalog and source list

[Laurent MICHEL]

Mireille

I agree with your definitions except for one item (see below)

Le 24/03/2020 à 11:06, Mireille LOUYS a écrit :
> hi all,
> 
> here is my suggestion for the term */catalog/* as it has been used so 
> far in the VO
> 
> /catalog/:
> 
> a set of physical quantities recorded from an observing/simulation 
> process and measured/computed for a set of individual astronomical 
> objects (sources).
> Each catalog entry corresponds to one individual source object.
A catalog has no necessary one individual source per row.
- XMM provides a catalog of detections, thus sources that have been 
detected several times are duplicated in the catalogue (likely with 
different parameters).

To me the concept of catalog is related to something that has been 
compiled from different progenitor datasets. *Data compilation* is the 
key of the catalog definition.

LM

> The usual representation is a table with columns figuring the quantities 
> and rows representing an entry.
> 
> /source list:/
> 
> a catalog where entries are derived from one or a restricted set or data 
> products : single image, multiband image, radio or hyperspectral cube, 
> eventlist for instance.
> 
> Typically, ObsTAP can handle source list as dataproducts, with coverage 
> inherited from the progenitor dataset.
> 
> On the contrary very large catalogs like survey, hips catalogs with 
> coverage='allsky' are managed within archives/datacenters and searched 
> on with keywords from the astronomical semantics, like type of objects, 
> regime, instrument types, survey name, etc.
> 
> Here is an interface example: http://cdsarc.unistra.fr/viz-bin/cat
> 
> Are there server applications distributing such all sky catalogs with 
> Obscore as one single dataproduct?
> 
> best , Mireille
> 
> -- 
> --
> Mireille Louys,  MCF (Associate Professor)
> CDS				IPSEO, Images, Laboratoire Icube
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