Handling data cubes in VO

[Arnold Rots]

Access to 3-D cubes requires a single generalized interface.
Otherwise you are going to (a) confuse the users and (b) fail to cover
some cases.

The access model is simply: everything - full cube, cut-out cube
(including those with only one pixel along one or more axes),
all possible transpositions, 2-D slices along any plane in three
dimensions, 1-D slices along any curve in 3 dimensions.

Believe me, they are all needed.

  - Arnold

Francois Bonnarel wrote:
[ Charset ISO-8859-1 unsupported, converting... ]
> Hi Doug and others,
> 
>     A short answer to this 3D initiative report Doug,
> 
>     For the protocol to handle 3D Cubes I agree that SIA could easily
> extend to evenly sampled data cubes.
>     But there has been a meeting in Marseille a couple of monthes ago
> organised by Phillipe Prugniel who adressed the problem of the IFU
> data. There are plans to integrate some test archives in the vO as SSA
> services. Because those kind of data are better described as set of
> spectra...
> 
>     The access model in SIA/SSA should be multiple: either full data
> retrieval , or various kind of cutouts ( slices, spectra or smaller
> cubes as you propose). I think we need something like a real modelizing
> effort on the acces and views to a given data set.
> 
>      As mentioned by Anita, there has been a CADC/CDS development for CGPS
> which illustrates ( for slices access mode only at the moement) the
> concept of a server which distributes parts of a 3D dataset interfaced
> with a VO-client (here Aladin). It has been designed as an implementation
> of the SIA extension concept (one observation -> several access and views)
> It is on line and working since six monthes
>   See : http://www1.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/cgps/navigate.html
> 
> Best regards to all.
> Fran?ois
> 
> =====================================================================
> Francois   Bonnarel               Observatoire Astronomique de Strasbourg
> CDS (Centre de donnees          11, rue de l'Universite
> astronomiques de Strasbourg)    F--67000 Strasbourg (France)
> 
> Tel: +33-(0)3 90 24 24 11       WWW: http://cdsweb.u-strasbg.fr/people/fb.html
> Fax: +33-(0)3 90 24 24 25       E-mail: bonnarel at astro.u-strasbg.fr
> ---------------------------------------------------------------------
> 
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Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots at head.cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
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