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A VO experience: Lessons learnt from accessing SIA compliant image servers with the AVO prototype PowerPoint PPT Presentation


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F.Bonnarel on behalf of M.Allen, T.Boch, M.Dolensky, D.Durand, P.Fernique, M.Louys, A.Micol, A.Richards, A.Schaaff, N.Walton. A VO experience: Lessons learnt from accessing SIA compliant image servers with the AVO prototype. A VO experience.

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A VO experience: Lessons learnt from accessing SIA compliant image servers with the AVO prototype

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A vo experience lessons learnt from accessing sia compliant image servers with the avo prototype l.jpg

F.Bonnarel on behalf of M.Allen, T.Boch, M.Dolensky, D.Durand, P.Fernique, M.Louys, A.Micol, A.Richards, A.Schaaff, N.Walton

A VO experience:Lessons learnt from accessing SIA compliant image servers with the AVO prototype


A vo experience l.jpg

A VO experience

Image access for the AVO scientific demo:

  • Use ALADIN as the core display system for the AVO prototype.

  • Two types of image access:

    • Using the CDS image server (e.g. GOODS data provided by ESO, STScI)

    • Other external image servers (e.g. CHANDRA)

  • Visualize the field of views.

  • Image cut-out limits on previews.


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A VO experience

  • Accessing image data before SIA

    • Images qualifiers stored in the CDS image server

    • Links to the images via URL stored in the observation logs from VIZIER

    • Links to other servers using miscellaneous methods (SKYVIEW, DSS servers, SuperCosmos). GLU descriptions. Availability problem.


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A VO experience

  • Accessing image data with SIA - the availability issue.

    • Common request syntax

    • Using “standard” metadata

      • To describe images of all the compliant servers

      • To formulate queries using the metadata

    • Using “standard” access layer. Agreement on the required and optional metadata fields

    • Allow distributed image access (no need to store everything at one place)


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A VO experience

  • Problems found with present SIA compliant servers:

    • Wrong URLs

    • Wrong UCDs (VOX:Image_AccessReference)

    • Required fields missing (Image_Title, Image_Scale, Image_Naxis)

    • Useful optional fields missing (BandPass_ID, WCS)

    • SIA 1.1 will provide data collection field

    • Other SIA 1.0 limitations discussed during the interoperability meeting


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A VO experience

Writing a SIA interface: the AVO prototype example.

  • Need for a VOTable parser: (SAVOT) ---> a VOTable object in memory

  • Need for a visual structure manipulation: the metadata tree

  • The TreeBuilder provides flexible organisation of VOTable fields and resources in the metadata tree.

  • In addition to metadata display, the interface can use the metadata to draw observation centres, FOV, etc..


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A VO experience

Accessing image data: metadata factorization issue.

  • Parallel development of the IDHA VOTable and SIA for the purposes of the AVO scientific demonstration.

  • main difference with SIA is that factorization of the metadata is possible in IDHA

  • main part of the AVO prototype chain from the VOTable document to the metadata tree is the same for both SIA and IDHA VOTables

  • Other kinds of VOTable descriptions of the metadata could be integrated in the same way (e.g future versions of SIA)


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How is it working?

TreeBuilder

Actions

Metadata tree

VOTable object

VOTable Parser

Display

VOTable document (SIA, IDHA, etc…)


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A VO experience

  • Image data accessible from the AVO prototype:

    • SIA servers at NOAO, Skyview, CADC, NCSA, Skyview, IPAC, XMM-Newton, SDSS, CDS, NAOJ, etc...

    • IDHA servers at CDS, and HST facilities

    • IDHA local document accessing image data at Jodrell Bank

    • Local SIA VOTABLES document could also be read


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A VO experience

  • Some Key Words:

    • The ALADIN Java interface

    • AVO prototype

    • VOtable1.0

    • Metadata tree

    • SIA 1.0 VOtables

    • IDHA VOtables

    • IDHA model


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