[PROJ] WKT CRS

[Lesparre, Jochem]

I see differences between "WKT Version 2" from EPSG (e.g. https://epsg.org/crs/wkt/id/10764) and "WKT2:2019" from projinfo (e.g. projinfo epsg:10764).


  1.  A lot of IDs that are mentioned in the EPSG version are missing in projinfo.
What I personally miss mostly is the IDs for PROJCRS and VERTCRS in a COMPOUNDCRS.
Confusingly, the ID["EPSG",8806] for the LENGTHUNIT["metre",1] is not given by projinfo for ELLIPSOID, but is given for PARAMETER["False easting" etc. in projinfo.

  1.  Some other data like PRIMEM and USAGE are mentioned by projinfo, but not in the EPSG version.

Why the differences, and is there a correct way?

It seems to me that most of the information is redundant anyway, just the EPSG code could do: e.g. COMPOUNDCRS["Bonaire DPnet + Bonaire height",ID["EPSG",10764]]. What elements are mandatory and what not? This is relevant to me because we might want to change the CONVERSION of some PROJCRSs in EPSG in the future without changing the ID of the PROJCRS. Omitting the CONVERSION and only mentioning the ID of the PROJCRS in the WKT therefore seems a saver choice for the metadata of geo-information. Is this allowed?

Jochem




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