[PROJ] Alternative PROJJSON implementations?

[Martin Desruisseaux]

Hello all

Thanks to those who replied. So we have so far:

  * pyproj for custom CRS building capability
  * spatialreference.org for output and for extracting axis information
    directly from the JSON file
  * rasterio (based on GDAL if I'm understanding right?)
  * Digital Coast Data Access Viewer grabs some projection information
    from PROJJSON

More specifically, we would like to clarify which implementations exist 
in addition of PROJ. Is the following correct?

  * pyproj, spatialreference.org and rasterio use PROJ for
    reading/writing PROJJSON.
  * spatialreference.org and Digital Coast Data Access Viewer grab
    information directly from the PROJJSON file, which could be seen as
    a kind of implementation.

Thanks,

     Martin

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