aladin, vo standards, spectra and datacubes t.boch, f.bonnarel, p.fernique (cds, aladin development...
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Aladin, VO standards, spectra and datacubes
T.Boch, F.Bonnarel, P.Fernique
(CDS, Aladin development group)
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SIA and SSA in Aladin• SIA is not dealing with spectra but with 2D images or
cubes.• Major breakthrough to access all registered services ( MAST, SDSS, CADC, VO_Paris MAMA…)• Different of older Aladin or Skyview or SUPERCOSMOS
accesses• In Aladin it’s possible to
– retrieve an SSA query response around a position, – visualize where it is on the screen …– load the spectrum into VOSPEC (or SPLAT or SPECVIEW)
using PLASTIC protocol (or ad hoc protocols)
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IFU, Euro3D data• An IFU is a set of spatially evenly distributed spectra.• Euro3D is a FITS format for such IFU data where each
spectrum is a strongly standardized raw… (all the data points are in a cell) ASPID-SR, Giraffe are on line databases of such IFU – (ASPID-SR uses characterization internally, collaboration with
IgorChilingarian, Ivan Zolothukin and Mireille Louys)
• VO-Paris EuroVO 3D can send the positions of the spectra to Aladin and selected spectra to VOSPEC (using Plastic) see demo tommorrow by Igor.
• Interaction with EURO 3D tool using PLASTIC ?
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Data Cubes• Evenly sampled data in 3 directions : extended WCS.
• Most common: x,y,lambda. Result of extended processing: – Radio Interferometry (NRAO, IRAM,JB, Westerbork…), – Fabry Perot (CIGALE, Scorpio,etc …,) in optical, – Processed IFU (Symphony, …)
• Aladin can load cubes, display them in blinking mode , extract some slice, show lambda profile.
• For VO access:– standard SIA is fine to query/retrieve small cubes,– for large ones we need an extended facility: several access
modes to the same dataset…
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Multi access and views of a dataset
(preliminary generic dataset discovery )• Add several records in a DAL Extension RESOURCE
hooked to each observation description in the main query response RESOURCE:
• full download, preview, slice , « sub-cube », 1D spectrum at a given position.
• CGPS Archive navigator (collaboration with D.Durand/CADC) illustrates the Generic Dataset discovery concept of DAL (for complex data « tree of DAL protocols «
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Standards used
• Official standards: SIA, SSA, VOTABLE
• Emerging protocols:– DAL Extensions, – Characterization DM, – VO application communication (PLASTIC?)