Simple Image Access International VIRTUAL OBSERVATORY

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Presentation transcript:

Simple Image Access International VIRTUAL OBSERVATORY V1.1 Upgrade Planning Doug Tody (NRAO) IVOA, Kyoto May 16-20 2005

SIA V1.1 Planning Goals Probably Defer Issues Update and enhance metadata; consistent with SSA Metadata extension mechanism (FB et.al.; presentation) Some new functionality (LName, score, compression, etc.) Anything else? (e.g., spectral data cubes) Probably Defer Web Services interface Asynchronous i/o, staging to VOStore, authentication, etc. (infrastructure not ready yet) Issues Interface change! Will require code modifications Should have careful policy for how to handle such upgrades IVOA, Kyoto May 16-20 2005

IVOA, Kyoto May 16-20 2005

Goals for SIA V1.1 Update and enhance metadata Some new functionality Take SSA as the starting point Generic dataset metadata is common Metadata extension mechanism Some new functionality LName, score, compression, etc. Anything else? e.g., spectral data cubes IVOA, Kyoto May 16-20 2005

SIA V1.1: Probably Defer Web Services interface Not worth it until we have functionality which needs it, e.g., staging etc. Asynchronous i/o, staging to VOStore, authentication, etc. Infrastructure not ready yet Would be good to prototype though IVOA, Kyoto May 16-20 2005

SIA V1.0 Query Interface Required Optional Image Generation POS, SIZE, FORMAT Optional INTERSECT VERB Image Generation NAXIS CFRAME,EQUINOX CRPIX,CRVAL,CDELT ROTANG, PROJ IVOA, Kyoto May 16-20 2005

SIA V1.0 Query Response Image Metadata Image.Title Descriptive title Image.Instrument Instrument name Image.MjDateObs Mean time of obs Image.POS RA, DEC Image.Naxes Number of axes Image.Naxis[] Axes length (vector) Image.Scale Image scale (vector) Image.Format Output format IVOA, Kyoto May 16-20 2005

SIA V1.0 Query Response World Coordinate System STC_CoordRefFrame ICRS, etc. STC_CoordEquinox Equinox (if needed) WCS_CoordProjection TAN, SIN, etc. WCS_CoordRefPixel Reference pixel (vector) WCS_CoordRefValue WCS Value at RefPixel IVOA, Kyoto May 16-20 2005

SIA V1.0 Query Response Spectral Bandpass (Characterization) BandPass_ID Filter or band name BandPass_Unit SpectralCoord unit BandPass_RefValue Characteristic value BandPass_HiLimit Upper limit value BandPass_LoLimit Lower limit value IVOA, Kyoto May 16-20 2005

SIA V1.0 Query Response Processing Metadata Image_PixFlags Pixel processing IVOA, Kyoto May 16-20 2005

SIA V1.0 Query Response Access Metadata Image_AccessReference URL Image_AccessRefTTL Time to live of acref Image_FileSize Approximate file size IVOA, Kyoto May 16-20 2005

SIA V1.1 Upgrade Issues How to roll-out new interfaces Versioning essential Describe in registry and at service level Service can support multiple interfaces (and hence versions) Plan to keep old interface around for at least one cycle User wants to defer upgrading until time is right IVOA, Kyoto May 16-20 2005

IVOA, Kyoto May 16-20 2005

DAL Roadmap Update SSA SIA ADQL/DAL integration V0.9 WD Discussed in Kyoto V0.9+ WD Summer 05 updated draft, trials V1.0 WD Madrid (Oct 05) - ready for general implementation SIA V1.0 WD Draft V1.1 WD Discuss in Madrid (Oct 05) ADQL/DAL integration Agreement on architecture, respective roles of ADQL and DAL Targets as coordinated with VOQL Reference Implementations Service framework (still in concept/design phase) VO-Client (still in concept/design phase) IVOA, Kyoto May 16-20 2005