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

2. 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

3. IVOA, Kyoto May

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. SIA V1.0 Query Response Processing Metadata
Image_PixFlags Pixel processing
IVOA, Kyoto May

11. 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

12. 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

13. IVOA, Kyoto May

14. 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