[PROJ] Alternative PROJJSON implementations?

[Howard Butler]

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