[PROJ] PROJ 9.8.1 release candidate and motion to approve it

[Alan Snow]

🚀 Alan

On Wed, Apr 8, 2026, 7:12 AM Even Rouault via PROJ <proj at lists.osgeo.org>
wrote:

> Hi,
>
> I've prepared a release candidate for PROJ 9.8.1, ahead of the planned
> schedule, to address the ETRS89 related issues mentioned in the below
> release notes.
>
> Download the archives here:
>
> https://download.osgeo.org/proj/proj-9.8.1RC1.tar.gz
> https://download.osgeo.org/proj/proj-9.8.1RC1.zip
>
> Community members, please report any issue.
> PSC members, please test and cast your vote to promote it to final 9.8.1
>
> Starting with my +1
>
> Even
>
> ## 9.8.1
>
> ### Warning
>
> It was discovered after the PROJ 9.8.0 release that several EPSG updates
> introduced
> after EPSG v12.033 - notably the introduction of national realizations
> of ETRS89
> (ETRS89-XXX […] where XXX is the 3-letter ISO country code) - caused
> backward
> incompatibilities in some workflows involving the ETRS89 CRS.
>
> In particular, transformations between ETRS89 and national CRSs based on
> other
> datums are known to be affected for Austria, Belgium, Catalonia, the
> Netherlands,
> Romania, and Serbia. See #4736 for more details.
>
> While we intend to resume tracking the latest EPSG releases in future PROJ
> versions, the safest solution identified so far to address these
> regressions is to
> **revert the EPSG related content of its database from EPSG v12.049 to
> v12.029**,
> where v12.029 was the version distributed with PROJ 9.7.1
>
> As a consequence of this revert, the EPSG datum and CRS records
> introduced in
> PROJ 9.8.0, which are mostly related to the new ETRS89-XXX datum and
> CRS, are no
> longer available in PROJ 9.8.1.
>
> ### Updates
>
> * Database: **Revert content from EPSG v12.049 to v12.029** (#4741).
>    See above warning for more details.
>
> * CMake: handle deprecated SQLite::SQLite3 target in CMake 4.3 (#4694)
>
> ### Bug Fixes
>
> * Make sure that epoch is set in more scenarios of time-dependent
> transformations (#4688)
>
> * pj_obj_create: use database context if already open for grid name
> resolution (#4703)
>
> * Chain vertical CRS transformations through intermediate same-datum
> vertical CRS (#4711)
>    Helps for example for **EPSG:5705** (Baltic 1977 height) to
> **EPSG:5706** (Caspian depth)
>    by using intermediate operation from Baltic 1977 height to Caspian
> *height*
>
>
> --
> http://www.spatialys.com
> My software is free, but my time generally not.
>
> _______________________________________________
> PROJ mailing list
> PROJ at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/proj
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/proj/attachments/20260408/8f2b8620/attachment.htm>