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<p>Dear Apps members, </p>
<p>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).<br>
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. </p>
<ul>
<li>Github repository :<span class="Apple-converted-space"> </span><a
class="moz-txt-link-freetext"
href="https://github.com/ivoa-std/HiPS">https://github.com/ivoa-std/HiPS</a></li>
<li>PDF direct link :
<a class="moz-txt-link-freetext" href="https://github.com/ivoa-std/HiPS/releases/download/auto-pdf-preview/HiPS-draft.pdf">https://github.com/ivoa-std/HiPS/releases/download/auto-pdf-preview/HiPS-draft.pdf</a></li>
<li>IVOA web site document :<span class="Apple-converted-space"> </span><a
class="moz-txt-link-freetext"
href="https://www.ivoa.net/documents/HiPS/">https://www.ivoa.net/documents</a> (soon
available)</li>
</ul>
<p>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.</p>
<p>To help to the reading, additional HiPS cubic extension
presentation, libraries and tools can also be found below:</p>
<ul>
<li>HIPS3D related presentations at the last Interop IVOA Gorlitz
Nov 2025:<span class="Apple-converted-space"> </span><a
class="moz-txt-link-freetext"
href="https://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpNov2025Apps">https://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpNov2025Apps</a>
</li>
<li>CDS HiPS3D discovery tutorial:<span
class="Apple-converted-space"> </span><a
class="moz-txt-link-freetext"
href="https://aladin.cds.unistra.fr/java/TutoHiPS3Den.pdf">https://aladin.cds.unistra.fr/java/TutoHiPS3Den.pdf</a>
</li>
<li>Python reproject HiPS3D extension:<span
class="Apple-converted-space"> </span><a
class="moz-txt-link-freetext"
href="https://reproject.readthedocs.io/en/latest/hips.html">https://reproject.readthedocs.io/en/latest/hips.html</a>
</li>
</ul>
<p>For all HiPS authors and contributors<br>
Pierre Fernique</p>
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