Proposal for SODA test implementations

[François Bonnarel]

Last of my three emails of today,

   Let me make a proposal to the DAL community and to data providers 
willing to expose data  Cubes (dim >= 3) in the VO.

     The idea is to try to realize the basic scenario described in the 
CSP requirement by using SIAV2 or OBstap implementations, as well as  
DataLink and the current version of SODA spec. This should be operated 
on real cubes ( 2D images or spectra would not be considered as good 
validation) and it's not necessary to demonstrate additional (more 
sophisticated ) server side operations. Additional specifications for 
Domain metadata or subtilities in pathes to SODA or DataLink use can be 
added  and should be described but the prototyping should clarify what 
they really add to the use case realisation.
     Demonstrations of implementations or prototypes should occur in DAL 
session at Cape Town. Contact me if you want to participate and make a 
demo in Cape Town.

     The CSP requirements can be found below.
         I consider that CADC new SODA version is the first of those 
test implementations for Cape Town


Cheers
François

CSP requirements

a ) Data Discovery (Query)
A service shall return to the client a list of observations, and
the corresponding metadata for each observation, meeting the
user imposed constraints. In the event that the user places no
constraints, the entire list of observations, and the correspondin
metadata for each data set, shall be returned. In the event that no
data meet the user's constraints, the service shall indicate the
absence of any matches.


b ) Data Access
* Once a user has the list of observations that satisfy the
constraints, they select all or a subset of the observations and:
* Download the complete science data for each of the
selected observations (the service shall return the complete
  multidimensional science data and metadata for each selected
observation) or;
* Download simple cutouts of the science data for each of the
selected observations (the service shall be able to extract and
return a user specified subset of the complet
e multidimensional
science data and metadata for each selected observation).


Simple Cutout
* For a simple cutout, the user specified subset is restricted to
be a contiguous interval within each dimension of the multidimensional 
science data.
The user should *not* be allowed to specify subsets with "gaps" or 
resampling or anything like that.
* Spatial: a circle (a coordinate and a radius)
* Energy: one interval (from energy1 to energy2)
* Time: one interval (from time1 to time2)
* Polarization: a list

-- 
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François   Bonnarel           Observatoire Astronomique de Strasbourg
CDS (Centre de données        UMR 7550 CNRS / Université de Strasbourg
astronomiques de Strasbourg)  11, rue de l'Université
                               F--67000 Strasbourg (France)
     
Tel: +33-(0)3 68 85 24 11     WWW: http://cdsweb.u-strasbg.fr/people/fb.html
Fax: +33-(0)3 68 85 24 25     E-mail: francois.bonnarel at astro.unistra.fr
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