Observation/dataset datamodel: Restart non-characterization efforts? F.Bonnarel (CDS), M.Louys (ULP/LSIIT) IVOA Interop meeting 05/19/2006 Victoria F.Bonnarel (CDS)

Global observation data model Global observation datamodel has been discussed from 2002 to 2004. Boston meeting was the last time it was considered as a whole After that we concentrated on characterization Other components: Provenance (software, observation, simulation) Curation (like in Spectrum ?) Packaging, Missing Practical Stuff and Data Access and Views. Restart effort on this, in the scope of a General Dataset Model? IVOA Interop meeting 05/19/2006 Victoria F.Bonnarel (CDS)

IVOA Interop meeting 05/19/2006 Victoria F.Bonnarel (CDS)

IVOA Interop meeting 05/19/2006 Victoria F.Bonnarel (CDS)

IVOA Interop meeting 05/19/2006 Victoria F.Bonnarel (CDS)

Need for a Provenance describe the history of the data.... Understand where the difference between the characterization of the data is coming from. necessary for correlation of data from various origins reprocessing For managing links between several stages in Observation. IVOA Interop meeting 05/19/2006 Victoria F.Bonnarel (CDS)

Provenance Observing Components and Software components List them Describe how they affect the characterization of the data (reuse of char in this context?) See Frederic/mireille talk for Simulated data IVOA Interop meeting 05/19/2006 Victoria F.Bonnarel (CDS)

DataAccessAndViews Driver: The Generic DataSet Discovery (see DAL session 3) Purpose: formal definition for describing the various access modes , references and views for the same (« complex ») dataset. Provide utypes and structure for Generic Data Set Discovery Protocols IVOA Interop meeting 05/19/2006 Victoria F.Bonnarel (CDS)

AccessAndViews components AccessAndViewsReference: URL, URI, etc... as in SSA AccessAndViewsFormat: mime/type image/fits image/jpeg spectrum/fits spectrum/votable spectrum/xml text/ascii text/html text/xml text/votable (etc ...) as in SSA (more values) AccessAndViewsSize: size in bytes as in SSA AccessAndViewsProductType: cube, image, spectrum, catalog, metadata Different from the DataSetType of the DataSEt itself, (Type of the Specific view). catalog, as a result of source extraction metadata to allow the retrieval of full metadata descriptions such as characterisation ... IVOA Interop meeting 05/19/2006 Victoria F.Bonnarel (CDS)

IVOA Interop meeting 05/19/2006 Victoria F.Bonnarel (CDS)

AccessAndViews attributes AccessAndViewsTransform: FullDataSet, Cutout, Reprojection, as developped in Doug's document AccessAndViewsGenerationParameters: location, bounds, wcs, sampling, resolution, kernel    These parameters, similar to the Image Generation Parameter   necessary to generate a real view according to a specific transform. exact list is dependant on specific transforms AccessAndViewsRoleName: free string: eg "Full retrieval" , Preview, "Deconvoluated Image" What the Views are intended to be used to in the discovery/access process. AccessAndViewsRetrieval: true/false True would allow direct retrieval while false would initiate a new "query response" IVOA Interop meeting 05/19/2006 Victoria F.Bonnarel (CDS)

AccessAndViews attributes Reprojection or processing types distinguish between several subtypes of "projection" including some kind of processing: Registering/Resampling, Mosaicing, Deconvolution, Filtering, Segmentation Deconvolution, filtering and Segmentation: can they be seen as special case of projection ? Or should we group them in a 4th category: let say "Processing" or "Interpretation"? Transform /Generation Parameters dependancy FullDataSet: none Cutout: location, bounds Registering: wcs Resampling: sampling, kernel Mosaicing: location, bounds, wcs, sampling, kernel Deconvolution; resolution: kernel Filtering: kernel Segmentation: ad hoc parameters of the dedicatec algorithm? IVOA Interop meeting 05/19/2006 Victoria F.Bonnarel (CDS)