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.
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
> ---------------------------------------------------------------------
>
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/ --------------------------------------------------------------------------Received on 2005-12-26Z14:53:54