1 / 39

Interoperability of astronomy data bases Françoise Genova, CDS

Interoperability of astronomy data bases Françoise Genova, CDS. 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.

cirila
Download Presentation

Interoperability of astronomy data bases Françoise Genova, CDS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Interoperability of astronomy data basesFrançoise Genova, CDS F. Genova, VO as a Data Grid, 2003/06/30

  2. 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, 2003/06/30

  3. Object name >> position An early example of interoprerability: Name resolver F. Genova, VO as a Data Grid, 2003/06/30

  4. Evolving world - Web Services - Very Large Surveys Simbad Name Resolver >> Sesame Web Service F. Genova, VO as a Data Grid, 2003/06/30

  5. Web Services as building blocks F. Genova, VO as a Data Grid, 2003/06/30

  6. 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...351.1003G F. Genova, VO as a Data Grid, 2003/06/30

  7. References in an • on-line article • links to ADS • quality check F. Genova, VO as a Data Grid, 2003/06/30

  8. 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, 2003/06/30

  9. ADS From bibliography To the original observations Search an author’s publications F. Genova, VO as a Data Grid, 2003/06/30

  10. F. Genova, VO as a Data Grid, 2003/06/30

  11. F. Genova, VO as a Data Grid, 2003/06/30

  12. HST archive From observation To publication F. Genova, VO as a Data Grid, 2003/06/30

  13. A&A on line From publication to SIMBAD and more F. Genova, VO as a Data Grid, 2003/06/30

  14. Simbad Information About the object F. Genova, VO as a Data Grid, 2003/06/30

  15. Links To high energy observations in HEASARC, To Catalogues F. Genova, VO as a Data Grid, 2003/06/30

  16. Links from object names in journals: an early example: IBVS F. Genova, VO as a Data Grid, 2003/06/30

  17. Links to images and data F. Genova, VO as a Data Grid, 2003/06/30

  18. GCVS F. Genova, VO as a Data Grid, 2003/06/30

  19. 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, 2003/06/30

  20. 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, VO as a Data Grid, 2003/06/30

  21. ReadMe F. Genova, VO as a Data Grid, 2003/06/30

  22. Tables published in articles are usable data! F. Genova, VO as a Data Grid, 2003/06/30

  23. Links to observational data (images, spectra, time series), often distributed in observatory archives F. Genova, VO as a Data Grid, 2003/06/30

  24. An homogenized view of heterogeneous information With links to data F. Genova, VO as a Data Grid, 2003/06/30

  25. Towards data integration • XML • VOTable > Roy’s talk F. Genova, VO as a Data Grid, 2003/06/30

  26. HEARSARC Browse Astrores in action! F. Genova, VO as a Data Grid, 2003/06/30

  27. 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, 2003/06/30

  28. Observations from European archives Inclusive: NASA missions HST, Chandra, surveys, … F. Genova, VO as a Data Grid, 2003/06/30

  29. Glu Tag Resolver Symbolic name >> URL F. Genova, VO as a Data Grid, 2003/06/30

  30. 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 (100.000 columns, 1.300 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, 2003/06/30

  31. UCD browser F. Genova, VO as a Data Grid, 2003/06/30

  32. Join on UCDs : UCD+units: conversion, selection Select catalogues & target F. Genova, VO as a Data Grid, 2003/06/30

  33. Colour excess characterizes carbon stars F. Genova, VO as a Data Grid, 2003/06/30

  34. F. Genova, VO as a Data Grid, 2003/06/30

  35. http://cdsweb.u-strasbg.fr/UCD/ F. Genova, VO as a Data Grid, 2003/06/30

  36. Extension of UCDs • SDSS: 1.500 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, 2003/06/30

  37. Validation, maintenance • A new structure • Prune the existing UCD tree • UCD steering group • Proposal in October 2003 • UCD V1.0 • Evolution mechanism F. Genova, VO as a Data Grid, 2003/06/30

  38. F. Genova, VO as a Data Grid, 2003/06/30

  39. 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?? F. Genova, VO as a Data Grid, 2003/06/30

More Related