[PROJ] Clarification on required contents of PROJ_DATA dir please

[Simon Eves]

Our system has used PROJ and GDAL for years, and I have been on the GDAL
dev list for a long time, but only just joined this one.

We do not currently redistribute anything from the separate *proj-data*
bundle, only the basic set of files that end up in *.../share* from a PROJ
make/install (*proj.db* and about 15 others, e.g. *nad83*)

This perhaps dates from when the full set of files was included in the main
bundle, but that is before my time, and obviously they have been split out
by you into a separate bundle for quite some time now, presumably because
of their size.

We have never had any issues (that we know of!) with failing to interpret
client data files, so evidently PROJ manages quite happily without the
additional files from the *proj-data* bundle but perhaps we should be
redistributing those as well?

If so, do we just combine the two sets of files into the same *PROJ_DATA*
directory?

Forgive me if there is documentation on this specific topic which I have
missed.

Finally, is the latest *proj-data-1.16* compatible with PROJ 9.3.0 (which
we have frozen on for our latest dependencies update) or must we use the
previous 1.14 from June? ...and what happened to 1.15? :)

Thanks in advance.

-- 
Simon Eves
Senior Rendering Engineer
+1 (415) 902-1996
simon.eves at heavy.ai

<http://www.heavy.ai>
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