IVOA Interoperability MeetingBoston, 2004/05/23-28 IVOA plenary session UCD R. Williams, S. Derriere, and the UCD folks.

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Presentation transcript:

IVOA Interoperability MeetingBoston, 2004/05/23-28 IVOA plenary session UCD R. Williams, S. Derriere, and the UCD folks

IVOA Interoperability MeetingBoston, 2004/05/23-28 UCD Documentation ➲ Main UCD document (currently v1.03) ● Syntax ● Meaning ● Usage ➲ List of reference words (v0.1, will evolve) ➲ EM spectrum (merge with list of words?) 3 papers:

IVOA Interoperability MeetingBoston, 2004/05/23-28 UCD1+ ➲ Atoms: errormagphotstat ➲ Words: phot.magstat.error ➲ UCD1+ words or combinations ● stat.error;phot.mag ➲ ~430 different words ➲ Need ~600 UCD1+ built from these words to describe 120,000 columns in VizieR

IVOA Interoperability MeetingBoston, 2004/05/23-28 Root atoms ➲ phys ➲ pos ➲ spect ➲ src ➲ stat ➲ time ➲ arith ➲ em ➲ instr ➲ meta ➲ obs ➲ phot cf. Note for list of reference words

IVOA Interoperability MeetingBoston, 2004/05/23-28 Transition from UCD to UCD1+ ➲ This is a 1-to-N mapping ● ERROR -> stat.error;***** ➲ Settling list of UCD1+ words (feedback!) ● add new words (em.wavenumber,...) ● define words for enumerated lists ? ➲ Are there too generic UCDs ? ● stat.paramobs.param ➲ Cases where no UCD exist/needed ● meta.cryptic... or leave blank

IVOA Interoperability MeetingBoston, 2004/05/23-28 Use of UCDs (1) ➲ As universal column names (cone search) ➲ Filters: $[phot.mag.*] < 16 UCD  predefined filters « best guess »

IVOA Interoperability MeetingBoston, 2004/05/23-28 Use of UCDs (2) ➲ Use in registry: locate catalogues based on contents ● User says : « B magnitude » ● Gets resolved in: phot.mag;em.opt.B ● Relevant datasets located ● Load data in, e.g. SED tool (best guess) ➲ Use of wildcards (UCD as strings) ➲ Translation layer

IVOA Interoperability MeetingBoston, 2004/05/23-28 UCD services ➲ Explore the list of words ➲ Natural language to UCD ➲ Help assign UCD to dataset ➲ Feedback form ● mailing list ● on-line form

IVOA Interoperability MeetingBoston, 2004/05/23-28

Questions ➲ Representing photometric colors: ● phot.color;em.opt.B;em.opt.Vmeans B-V ➲ Adding semicolon after every word ➲ UCD for SIAP ● pos.eq.ra;meta.main (if exists, else pos.eq.ra) ● logical name ➲ UCD for SSAP ● logarithm of a quantity (in units?) ● stat.error.sys ● word for interval ● better description of curation metadata (cf. RM doc)

IVOA Interoperability MeetingBoston, 2004/05/23-28 Actions ➲ Minor modifications to UCD 1.03, and promote to PR ➲ Improve list of words, and achieve v1.0 quickly ➲ DT: write SIAP 1.1 document ➲ RW: propose UCD1+ for SIAP 1.1 and iterate with UCD commitee ➲ JCM: send SSAP UCDs to UCD commitee