Dear all,
As I was looking to the SIM data model, I was asked about the characterisation of some specific derived data coming out of the Horizon simulation. I am speaking of these "maps" (either cubes or images) where the observable is a physical quantity (density, temperature, metalicity, etc ....). These data look much closer to observational images and cubes than let's say ... snapshots of particules. But indeed the physical quantity playing the role of Observable is definetly a "property" in the sense of SIM DM, as far as I understand.
Presently the characterization class of Sim DM related to individual properties and gathering some figures such as nominal value, min, max, mean value, stdv is actually not inferred from the IVOA char DM. The statistical moments needed by Sim DM are not currently present in Char DM. But I am wondering if in the long term it could not be a problem for IVOA to have this kind of discrepancy between two classes sharing the same name and playing very similar roles. The use case I adressed above: "Metallicity-kind maps" typically belongs to the two worlds.
As we, in the "Observation subgroup" of the DM WG are trying to upgrade Characterisation data model in the direction of a fine grain description with correct definitions and as SimDM is not yet recommended I am wondering if it would not be possible to work on an harmonization .... What do you think ?
Cheers
François
Francois Bonnarel Observatoire Astronomique de Strasbourg CDS (Centre de donnees 11, rue de l'Universiteastronomiques 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 ---------------------------------------------------------------------Received on 2008-05-29Z10:03:14