HiPS 2.0 WD announcement

[Pierre Fernique]

Dear Apps members,

At the fall IVOA Interop in Görlitz, the Application Working Group 
agreed to draft a new version of the HiPS document to take into account 
the generalisation to cubic data (HiPS3D).
HiPS authors and contributors are pleased to publish a first working 
draft of a version 2.0 of the HiPS IVOA standard. This second edition of 
the document mainly extends the HEALPix spherical discretization 
principle to a potential second physical dimension: time or frequency.

  * Github repository :https://github.com/ivoa-std/HiPS
  * PDF direct link :
    https://github.com/ivoa-std/HiPS/releases/download/auto-pdf-preview/HiPS-draft.pdf
  * IVOA web site document :https://www.ivoa.net/documents (soon available)

This document is the outcome of a collaboration among several authors 
and contributors, who now wish to share the draft with all members of 
the “Applications” Working Group as an opportunity to preview and review 
it ahead of the next Interop meeting in Strasbourg. This early feedback 
phase is intended to help refine the document and prepare for more 
in-depth, in-person discussions at the meeting. Please feel free to 
share comments, suggestions, or corrections via the IVOA Apps mailing 
list or directly in the above GitHub repository. If the feedback is 
positive and consistent, we may consider advancing this working draft 
into a recommendation proposal for the November 2026 Interop meeting.

To help to the reading, additional HiPS cubic extension presentation, 
libraries and tools can also be found below:

  * HIPS3D related presentations at the last Interop IVOA Gorlitz Nov
    2025:https://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpNov2025Apps
  * CDS HiPS3D discovery
    tutorial:https://aladin.cds.unistra.fr/java/TutoHiPS3Den.pdf
  * Python reproject HiPS3D
    extension:https://reproject.readthedocs.io/en/latest/hips.html

For all HiPS authors and contributors
Pierre Fernique
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