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Collaborative Page for SIA Interface

The Simple Image Access (SIA) interface defines a protocol for retrieving image data from a variety of multidimensional astronomical image/cube repositories through a uniform interface. The interface is meant to be reasonably simple to implement by service providers. A query defining a multi-parameter query is used to query for candidate images. The service returns a list of candidate datasets formatted as a VOTable. For each candidate image an access reference URL may be used to retrieve the image. Direct client-directed access to a remote image/cube dataset is also provided. Images may be returned in a variety of formats including FITS, other astronomical image formats, and various graphics formats. Referenced images are often computed on the fly, e.g., as cutouts from larger images.


Current SIAV2 Working Draft

The SIAV2 working draft has been split into two closely linked documents, the SIA version 2.0 specification per se, and the Image data model it is based upon. This version of SIA, and the new Image data model, are fully multidimensional and capable of dealing with cube data.

The 2013 SIAV2 working draft has been pretty much completely rewritten to make use of modern (draft) standards such as the ImageDM, DALI, and so on. The current (12Aug) draft is complete through the queryData request, although the query response section is still pretty rough. A key element which is not yet included in the draft is the accessData request, used to interactively slice/dice remote cubes. A preliminary description of the data access model behind accessData is given in the ImageDM working draft.

Older drafts and Related Papers

Since late 2009 SIA V1.0 is now an IVOA Recommendation.

A major update to the SIA interface, SIA V2.0, is in the planning stages. A partial working draft is available at the link above, as well as related analysis papers as noted on this page.

SIA Related IVOA Notes

- DougTody August 2013


VAO Prototyping Effort

editing in progress

The VAO Project is building a prototype SIAv2 service for presentation and demonstration at the Fall 2013 Interop. Below we provide some documentation on this effort. In particular, we will post information about our progress and results of this effort:

  • Test Queries:
  • Results:
  • *Note that the Baseline specifications represent frozen intermediate versions of the standards intended for setting the scope of our effort and evaluating the result. These are not to be considered as the current versions under development by the DAL-WG nor as in competition with them. Links to the current IVOA Working Drafts can be found at the top of this page.


    Topic attachments
    I Attachment History Action Size Date Who Comment
    PDFpdf 20120906Char2.pdf r1 manage 958.8 K 2013-05-23 - 08:43 JoseEnriqueRuiz CharDM v2.0 Draft as for September 06 2012
    PDFpdf Anita-InterferometryVO.pdf r1 manage 2123.3 K 2010-05-17 - 04:40 DougTody Anita's paper on radio data and SIAV2
    PDFpdf CubeDataInVO.pdf r1 manage 845.4 K 2013-05-08 - 00:44 DougTody Multidimensional (cube) Data in the VO - VAO Whitepaper, May 2013
    PDFpdf DAL2_Architecture.pdf r1 manage 89.7 K 2008-10-27 - 17:42 DougTody DAL2 Service Architecture and Standard Profile
    PDFpdf MultiDimDataVision2013-01-02.pdf r1 manage 96.9 K 2013-05-07 - 16:15 DougTody SAO Whitepaper on n-Cube Support in the VO (Rots et. al)
    PDFpdf Polarization.pdf r1 manage 389.0 K 2009-05-26 - 08:30 DougTody Note on polarization
    PDFpdf SIA-V2-Analysis.pdf r2 r1 manage 70.6 K 2008-10-27 - 18:30 DougTody SIAV2 scope and concepts (updated Oct08)
    Microsoft Word filedoc WD-SIAP-2.0-20091104.doc r1 manage 392.5 K 2009-11-09 - 15:26 DougTody SIAV2 draft (Nov 7) (source)
    PDFpdf WD-SIAP-2.0-20091104.pdf r1 manage 1129.8 K 2009-11-09 - 15:24 DougTody WD-SIAP-2.0-20091104.pdf
    PDFpdf WD-SIAP-2.0-20130812.pdf r1 manage 657.6 K 2013-08-16 - 20:02 DougTody SIAV2 draft as of 12Aug2013
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    Topic revision: r21 - 2013-09-03 - RayPlante
     
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