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The astrophysical Virtual Observatory

From information networking to information integration Lisbon, December 15 th , 2003. The astrophysical Virtual Observatory. Why keeping data in astronomy?. Long term observation of variable natural phenomena Major scientific objectives: Variability, evolution, statistics

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The astrophysical Virtual Observatory

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  1. From information networking to information integration Lisbon, December 15th, 2003 The astrophysicalVirtual Observatory F. Genova, ERPANET/CODATA workshop, 2003/12/15

  2. Why keeping data in astronomy? • Long term observation of variable natural phenomena • Major scientific objectives: • Variability, evolution, statistics • Observations with different techniques, at different scales  the physical phenomena at work F. Genova, ERPANET/CODATA workshop, 2003/12/15

  3. Large projects • Large ground- and space-based observatories • Large surveys • Optimize the scientific return by increasing usage Same goals for earth sciences! observation networks are also large projects F. Genova, ERPANET/CODATA workshop, 2003/12/15

  4. Networking of information in astronomy • A small discipline • Few commercial constraints • A long term partnership to define exchange standards and links F. Genova, ERPANET/CODATA workshop, 2003/12/15

  5. Networking of astronomical information Observations Ground- and space-based observatories Surveys Results Publications in electronic journals F. Genova, ERPANET/CODATA workshop, 2003/12/15

  6. Property rights • Observational data In general available after a proprietary period (1 year) • Journals • Table of contents and abstracts freely available • Full contents in general available after 3 years F. Genova, ERPANET/CODATA workshop, 2003/12/15

  7. The actors • Data producers Know instruments and methods  preserve ‘usable’ data and project memory • Disciplinary centers Data and information in a given domain • Journals Results • Data Centers Value-added services and generic tools F. Genova, ERPANET/CODATA workshop, 2003/12/15

  8. NetworkingThe astronomy bibliographic network Links between • electronic journals • the NASA ADS bibliographic database • on-line services (SIMBAD, NED) • archival data bibcodee.g.1999A&A...351.1003G F. Genova, ERPANET/CODATA workshop, 2003/12/15

  9. ADS From bibliography To the original observations Search an author’s publications F. Genova, ERPANET/CODATA workshop, 2003/12/15

  10. Select a publication F. Genova, ERPANET/CODATA workshop, 2003/12/15

  11. F. Genova, ERPANET/CODATA workshop, 2003/12/15

  12. Link to the ISO satellite data base F. Genova, ERPANET/CODATA workshop, 2003/12/15

  13. Data federationTabular 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, ERPANET/CODATA workshop, 2003/12/15

  14. F. Genova, ERPANET/CODATA workshop, 2003/12/15

  15. An homogenized view of heterogeneous information With links to data F. Genova, ERPANET/CODATA workshop, 2003/12/15

  16. Lessons learnt • De facto standards • Cooperation between all the actors + snowball effect Journals, ADS, data centers, archive centers • Easy-to-build link but contents / validation are fundamental better done by specialists from all partners F. Genova, ERPANET/CODATA workshop, 2003/12/15

  17. The Virtual Observatory « an enabling and coordinating entity to foster the development of tools, protocols, and collaborations necessary to realize the full scientific potential of astronomical databases in the coming decade » NVO White Paper, juin 2000 Science driven F. Genova, ERPANET/CODATA workshop, 2003/12/15

  18. The international Virtual Observatory Alliance • Many VO projects in different countries (e.g. the European AVO RTD project) • Each project has its own goals, depending on the project participants expertise and on the priorities of the funding agency (often IT money) • All projects participate in the International Virtual Observatory Alliance (IVOA) F. Genova, ERPANET/CODATA workshop, 2003/12/15

  19. F. Genova, ERPANET/CODATA workshop, 2003/12/15

  20. IVOA role • Contact between the projects (regular telecons) • A common roadmap: yearly demos • Intense activity on interoperability standard definition (email, face to face meetings – 30 people in Jan. 2002, 130 in Oct. 2003) • A International Astronomical Union WG to adopt the standards F. Genova, ERPANET/CODATA workshop, 2003/12/15

  21. F. Genova, ERPANET/CODATA workshop, 2003/12/15

  22. F. Genova, ERPANET/CODATA workshop, 2003/12/15

  23. F. Genova, ERPANET/CODATA workshop, 2003/12/15

  24. F. Genova, ERPANET/CODATA workshop, 2003/12/15

  25. Data access layer • A common standard to describe astronomical images: FITS (more than 30 years old) • IVOA data access layer: Simple image access protocal • On-going work on Simple spectral access protocol F. Genova, ERPANET/CODATA workshop, 2003/12/15

  26. A ‘flat’ data list F. Genova, ERPANET/CODATA workshop, 2003/12/15

  27. Data organization A view of the IDHA data model developed for the AVO demo Metadata at each level of the hierarchical data tree F. Genova, ERPANET/CODATA workshop, 2003/12/15

  28. Observations from European archives (AVO interoperability prototype) Inclusive: NASA missions HST, Chandra, surveys, … F. Genova, ERPANET/CODATA workshop, 2003/12/15

  29. The time dimension ** WNO 7 1951.839 1987.751 1995.653 F. Genova, ERPANET/CODATA workshop, 2003/12/15

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