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 SIA-2.0 working draft is available in the document repository:

The latest ImageDM working draft is available from the DM-WG pages.

Siav2RFC page

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 September 2013

VAO Prototyping Effort

The VAO Project is building a prototype SIAv2 service for presentation and demonstration at the Fall 2013 Interop. More information on the scope and progress of this effort can be found in the SIA2VAOPrototype page.

Topic attachments
I Attachment Action Size Date Who Comment
PDFpdf 20120906Char2.pdf manage 958.8 K 2013-05-23 - 08:43 JoseEnriqueRuiz CharDM v2.0 Draft as for September 06 2012
PDFpdf Anita-InterferometryVO.pdf manage 2123.3 K 2010-05-17 - 04:40 DougTody Anita's paper on radio data and SIAV2
PDFpdf CubeDataInVO.pdf manage 845.4 K 2013-05-08 - 00:44 DougTody Multidimensional (cube) Data in the VO - VAO Whitepaper, May 2013
PDFpdf DAL2_Architecture.pdf manage 89.7 K 2008-10-27 - 17:42 DougTody DAL2 Service Architecture and Standard Profile
PDFpdf MultiDimDataVision2013-01-02.pdf 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 manage 389.0 K 2009-05-26 - 08:30 DougTody Note on polarization
PDFpdf SIA-V2-Analysis.pdf 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 manage 392.5 K 2009-11-09 - 15:26 DougTody SIAV2 draft (Nov 7) (source)
PDFpdf WD-SIAP-2.0-20091104.pdf manage 1129.8 K 2009-11-09 - 15:24 DougTody WD-SIAP-2.0-20091104.pdf
PDFpdf WD-SIAP-2.0-20130812.pdf manage 657.6 K 2013-08-16 - 20:02 DougTody SIAV2 draft as of 12Aug2013
Topic revision: r26 - 2015-11-30 - JamesDempsey
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