[PROJ] Alternative PROJJSON implementations?

[Alan Snow]

The custom CRS building capability in pyproj is powered by PROJJSON:

https://pyproj4.github.io/pyproj/stable/build_crs.html

On Mon, Oct 21, 2024, 3:15 PM Howard Butler via PROJ <proj at lists.osgeo.org>
wrote:

> All,
>
> I am participating in the OGC CRS SWG [1] who is currently investigating
> the standardization of a JSON-based CRS definition such as PROJJSON [2].
> One question that came up in our discussion is whether or not there are any
> alternative software implementations of PROJJSON besides PROJ's itself. Did
> you write one? Are you using PROJJSON in commercial or open source software
> that isn't PROJ-based? Is forward/backward compatibility of PROJJSON a
> priority for you? Information about these questions would be useful for us
> to know regarding possible enhancement or evolution of PROJJSON going
> forward.
>
> There was also some interest in knowing where PROJJSON has been used in
> unexpected or unintentional ways. Are you using it as the CRS definition
> for your custom format or network protocol? We know of it being used by
> GeoParquet at the moment, but are there others?
>
> Please help inform our discussion around standardization of JSON-based CRS
> definitions with some feedback on your use of PROJJSON in the wild.
>
> Regards,
>
> Howard
>
>
>
> [1] https://github.com/opengeospatial/CRS-JSON-Encoding
> [2] https://proj.org/specifications/projjson.html
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