Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

Latest commit


Git stats


Failed to load latest commit information.
Latest commit message
Commit time



The Simple Image Access protocol (SIA) provides capabilities for the discovery, description, access, and retrieval of multi-dimensional image datasets, including 2-D images as well as datacubes of three or more dimensions.


The last stable version is REC-2.0.

SIA 2.0 ported to github

  • SIA 2.0 became an IVOA recommendation on december the 23rd 2015
  • Original source was an OpenOffice file
  • Here can be found the result of porting this specification to GitHub
  • Some changes in lay out of the document
    • "Status of the document" section is automatically generated by ivoatex process
    • Tables have a different rendering than in the original version
    • References are using the "\citep" flavor. They are generally quoted only once, with a few exceptions when it is ambiguous. Original version used the "[n]" notation for each occurence of the publication to be quoted in the text.
    • This porting has been made to allow authors to propose PR for identified errata and propose changes towards version 2.1

Want to contribute?

  1. Raise a GitHub Issue on this repository

  2. Fork this repository (eventually clone it on your machine if you want to)

  3. Create a branch in your forked repository ; this branch should be named after the issue(s) to fix (for instance: issue-7-add-license)

  4. Commit suggested changes inside this branch

  5. Create a Pull Request on the official repository (note: a git push is needed first, if you are working on a clone)

  6. Wait for someone to review your Pull Request and accept it

This process has been described and demonstrated during the IVOA Interoperability Meeting of Oct. 2019 in Groningen ; see slides)


Creative Commons License
The IVOA Architecture document is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.