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F. Genova, ERPANET/CODATA workshop, 2003/12/15
The astrophysicalVirtual ObservatoryFrom information networking
toinformation integration
Lisbon, December 15th, 2003
F. Genova, ERPANET/CODATA workshop, 2003/12/15
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
Large projects
• Large ground- and space-based observatories
• Large surveysOptimize 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
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
Networking of astronomical information
Observations
Ground- and space-based observatories
Surveys
Results
Publications in electronic journals
F. Genova, ERPANET/CODATA workshop, 2003/12/15
Property rights
• Observational dataIn 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
The actors• Data producers
Know instruments and methods preserve ‘usable’ data and project memory
• Disciplinary centersData and information in a given domain
• JournalsResults
• Data CentersValue-added services and generic tools
F. Genova, ERPANET/CODATA workshop, 2003/12/15
NetworkingThe astronomy bibliographic network
Links between
– electronic journals – the NASA ADS bibliographic database– on-line services (SIMBAD, NED)– archival data
bibcode e.g. 1999A&A...351.1003G
F. Genova, ERPANET/CODATA workshop, 2003/12/15
ADS
From bibliographyTo the originalobservations
Search an author’s publications
F. Genova, ERPANET/CODATA workshop, 2003/12/15
Select a publication
F. Genova, ERPANET/CODATA workshop, 2003/12/15
F. Genova, ERPANET/CODATA workshop, 2003/12/15
Link to the ISO satellite data base
F. Genova, ERPANET/CODATA workshop, 2003/12/15
Data federationTabular data in astronomy
A common description for tabular data– Reference catalogues– Published tables– Surveys– Catalogues of observations in archives
ReadMephysical organization contents
F. Genova, ERPANET/CODATA workshop, 2003/12/15
F. Genova, ERPANET/CODATA workshop, 2003/12/15
An homogenized view of heterogeneous informationWith links to data
F. Genova, ERPANET/CODATA workshop, 2003/12/15
Lessons learnt
• De facto standards
• Cooperation between all the actors
+ snowball effectJournals, 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
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
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
F. Genova, ERPANET/CODATA workshop, 2003/12/15
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
F. Genova, ERPANET/CODATA workshop, 2003/12/15
F. Genova, ERPANET/CODATA workshop, 2003/12/15
F. Genova, ERPANET/CODATA workshop, 2003/12/15
F. Genova, ERPANET/CODATA workshop, 2003/12/15
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
A ‘flat’ data list
F. Genova, ERPANET/CODATA workshop, 2003/12/15
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
Observations from European archives (AVO interoperability prototype)Inclusive: NASA missions HST, Chandra, surveys, …
F. Genova, ERPANET/CODATA workshop, 2003/12/15
The time dimension
** WNO 7
1951.8391987.7511995.653