[OSGeo-Standards] PROJJSON OGC Community Standard Submission?

[Rob Atkinson]

Note there is a plan to work on CRS ontologies too..

A JSON-LD mapping to this would be the reason to use PROJJSON instead of a model-derived JSON schema that provides a clean mapping.

GeoJSON has a JSON-LD mapping, this is not unprecedented.

On the other hand STAC is a bit of a mess to map to any common models - its has a lot of idiosyncratic sub-schemas that would need pre- or post-processing rules to turn into something clean - such as mapping the themes extension (used by Records) to dublin core

Some exploration of this here: https://ogcincubator.github.io/bblocks-stac/bblock/ogc.contrib.stac.extensions.themes

(if you look closely you will the challenges created by STAC's approach to mutually incompatible schemas for versions...  open to ideas how this should be handled!)



Rob Atkinson
Senior Research Engineer  | Open Geospatial Consortium (OGC)
Mobile: +61 419 202973
ratkinson at ogc.org<mailto:ratkinson at ogc.org> | ogc.org<http://ogc.org/> | @opengeospatial


[https://ci3.googleusercontent.com/meips/ADKq_NYvdzG5CnR-DX7WeJyPCnJuhbJ_G7lH1yVbaql72titKCiG-t4HQ92DiCCRM2jU42bDT20Ge7sBVIodm8VpmVBlrnTKCg=s0-d-e1-ft#https://portal.ogc.org/files/?artifact_id=99287]

________________________________
From: Standards <standards-bounces at lists.osgeo.org> on behalf of Howard Butler via Standards <standards at lists.osgeo.org>
Sent: Wednesday, November 12, 2025 2:43 PM
To: standards at lists.osgeo.org <standards at lists.osgeo.org>
Subject: Re: [OSGeo-Standards] PROJJSON OGC Community Standard Submission?

No takers, interest, or guidance on this topic?

> On Oct 31, 2025, at 12:37 PM, Howard Butler <howard at hobu.co> wrote:
>
> Hello,
>
> The PROJ project plans to submit PROJJSON as an OGC Community Standard.  The application document was initiated three years ago [1] by myself and Even Rouault, but we were waiting to see if the OGC CRS SWG would build upon PROJJSON to create a JSON based encoding of CRS.
>
> To date, no draft has been published, the survey at the previous OGC meeting was ambiguous about how the organization would move forward, and if the CRS SWG chooses to revisit ISO 19111 conceptual model enhancements and their reflection through a JSON CRS definition, that work will in all likelihood be backwards and forwards incompatible with PROJJSON. Given the current situation, we would like to move forward with PROJJSON as a Community Standard.
>
> In the interim since we initiated the submission, PROJJSON adoption has continued to grow. STAC was recently recognized as a OGC Community Standard at the Boulder Members Meeting [2], and its Projection Extension references PROJJSON. GeoParquet 1.1 [3] uses PROJJSON as its CRS definition, Parquet references PROJJSON as a possible definition in its spatial types[4], and Zarr is looking at it for its geo-proj Zarr extension [5].
>
> We believe it makes sense to resume the application process for PROJJSON to be also recognized as a community standard. Even has prepared an update of the application at https://github.com/OSGeo/projjson-submission/pull/3.
>
> Does OSGeo want to be mentioned as one of the submitting organizations? If so, what's the process for a project to submit one of its works to OSGeo as a Community Standard? A successful motion raised on this mailing list?
> Kind regards,
>
> Howard and Even
>
>
> [1] https://github.com/OSGeo/projjson-submission
> [2] https://www.ogc.org/announcement/ogc-announces-publication-of-the-spatiotemporal-asset-catalog-community-standards/
> [3] https://geoparquet.org/releases/v1.1.0/
> [4] https://github.com/apache/parquet-format/blob/master/Geospatial.md
> [5] https://github.com/zarr-experimental/geo-proj
>

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