F. Genova, VO as a Data Grid, 2003/06/301 Interoperability of astronomy data bases Françoise Genova, CDS

F. Genova, VO as a Data Grid, 2003/06/302 Astronomy A small discipline Few commercial constraints A long term partnership to define exchange standards and links FITS: early data exchange format on-line information in astronomy: from observations to results

F. Genova, VO as a Data Grid, 2003/06/303 An early example of interoprerability: Name resolver Object name >> position

F. Genova, VO as a Data Grid, 2003/06/304 Evolving world - Web Services - Very Large Surveys Simbad Name Resolver >> Sesame Web Service

F. Genova, VO as a Data Grid, 2003/06/305 Web Services as building blocks

F. Genova, VO as a Data Grid, 2003/06/306 The astronomy bibliographic network Links between –electronic journals –the ADS bibliographic database –on-line services (SIMBAD, NED) –… archival data/published results bibcodee.g. 1999A&A G

F. Genova, VO as a Data Grid, 2003/06/307 References in an on-line article  links to ADS  quality check

F. Genova, VO as a Data Grid, 2003/06/308 ADS - Abstracts - Scanned articles - Links to original on-line paper - Links to other, distributed information e.g. original observations - Also-read articles

F. Genova, VO as a Data Grid, 2003/06/309 ADS From bibliography To the original observations Search an author’s publications

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F. Genova, VO as a Data Grid, 2003/06/3012 HST archive From observation To publication

F. Genova, VO as a Data Grid, 2003/06/3013 A&A on line From publication to SIMBAD and more

F. Genova, VO as a Data Grid, 2003/06/3014 Simbad Information About the object

F. Genova, VO as a Data Grid, 2003/06/3015 Links To high energy observations in HEASARC, To Catalogues

F. Genova, VO as a Data Grid, 2003/06/3016 Links from object names in journals: an early example: IBVS

F. Genova, VO as a Data Grid, 2003/06/3017 Links to images and data

F. Genova, VO as a Data Grid, 2003/06/3018 GCVS

F. Genova, VO as a Data Grid, 2003/06/3019 Lessons learnt De facto standard SIMBAD/NED, ADS, journals, archives Cooperation between all the actors + snowball effect Journals, ADS, data centres, archive centres The community is trained (everyday tools) Easy-to-build link but contents / validation are fundamental the role of experts remains fundamental for building value-added services

F. Genova, VO as a Data Grid, 2003/06/3020 Data federation Tabular data in astronomy A common description for tabular data –Reference catalogues –Published tables –Surveys –Catalogues of observations in archives ReadMe physical organization  contents

F. Genova, VO as a Data Grid, 2003/06/3021 ReadMe

F. Genova, VO as a Data Grid, 2003/06/3022 Tables published in articles are usable data!

F. Genova, VO as a Data Grid, 2003/06/3023 Links to observational data (images, spectra, time series), often distributed in observatory archives

F. Genova, VO as a Data Grid, 2003/06/3024 An homogenized view of heterogeneous information With links to data

F. Genova, VO as a Data Grid, 2003/06/3025 Towards data integration XML VOTable > Roy’s talk

F. Genova, VO as a Data Grid, 2003/06/3026 HEARSARC Browse Astrores in action!

F. Genova, VO as a Data Grid, 2003/06/3027 With a touch of GLU Générateur de Liens Uniformes Resource dictionary (shared, distributed, hierarchical name space, clone management…), knows the query syntax Resolver: symbolic name > URL An early registry prototype with many of the required functionalities (conversions, failure tests, …)

F. Genova, VO as a Data Grid, 2003/06/3028 Observations from European archives Inclusive: NASA missions HST, Chandra, surveys, …

F. Genova, VO as a Data Grid, 2003/06/3029 Glu Tag Resolver Symbolic name >> URL

F. Genova, VO as a Data Grid, 2003/06/3030 Data mining: the Uniform Content Descriptors A set of UCDs has been first developed in the frame of the ESO/CDS Data Mining project to describe VizieR catalogue columns ( columns, UCDs) Name for concept Assigned semi-automatically using column label, description and unit Used e.g. to check the coherence of information in tables

F. Genova, VO as a Data Grid, 2003/06/3031 UCD browser

F. Genova, VO as a Data Grid, 2003/06/3032 UCD+units: conversion, selection Select catalogues & target Join on UCDs :

F. Genova, VO as a Data Grid, 2003/06/3033 Colour excess characterizes carbon stars

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F. Genova, VO as a Data Grid, 2003/06/3036 Extension of UCDs SDSS: columns –Manual verification needed –Very few additional UCDs On-going: –UCDs for VOX –UCDs for IDHA data model Add ‘Metadata’ branch … FITS keywords are often not accurate

F. Genova, VO as a Data Grid, 2003/06/3037 Validation, maintenance A new structure Prune the existing UCD tree UCD steering group –Proposal in October 2003 –UCD V1.0 –Evolution mechanism

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F. Genova, VO as a Data Grid, 2003/06/3039 The future Other knowledge basis –List of object names –Journal keywords –Thesaurus (built by librarians)…  Astronomy described with different points of view  Converging towards an ontology of astronomy??