I have a list of units I would like to ensure are supported at a minimum here 
to ensure a safe conversion from WKT to the CF convention (note: only the ones 
with the type `length`). See: 
[unit_of_measure.sql](https://github.com/OSGeo/PROJ/blob/d928db15d53805d9b728b440079756081961c536/data/sql/unit_of_measure.sql).

And from what I can tell, only a subset are supported by the CF convention: 
[UDUNITS 
Database](https://www.unidata.ucar.edu/software/udunits/udunits-current/doc/udunits/udunits2.html#Database).

Here are some examples of missing units:
- British foot (Sears 1922) - 3.04799471538676203241e-01
- Indian foot (1975) - 0.3047995
- Gold Coast foot - 3.04799710181508809458e-01

I am sure there are others not supported by CF or WKT currently. When a unit 
that is not supported by the CF convention is found, what is the recommended 
procedure? Is this something that the developers of the `UDUNITS` program are 
interested in keeping in-sync?


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