[PROJ] Correcting metadata in GeoTIFF files

[Even Rouault]

Jochem,
>
> Since GeoTIFF grids are not supported in PROJ <6 and the 
> naptrans2008/2018 grids of the Netherlands are only needed with the 
> PROJ <6 behaviour, there is no need for naptrans2008.tif or 
> naptrans2018.tif. Could I ask to remove nl_nsgi_naptrans2018.tif (and 
> naptrans2018.tif, if present) from PROJ (and keep the .gtx versions, 
> if present in PROJ)?
>
Fine for me.
>
> Can I do this with the same pull request as replacing some other 
> GeoTIFF grid files for the Netherlands to correct metadata?
>
Sounds ok. See 
https://github.com/OSGeo/PROJ-data/blob/master/CONTRIBUTING.md#how-to-remove-a-file 
(the next version of PROJ-data will be 1.9)
>
> I think it would be a good idea to change the way a interpolation CRS 
> should be specified in a Geodetic TIFF Grid. The only mentioned 
> example of this was naptrans2008 and this grid is no longer needed, so 
> this change seems not very urgent if naptrans2008.tif and 
> naptrans2018.tif grids are removed. However, we should at least edit 
> the documentation so it no longer mentions naptrans2008 as example in: 
> https://proj.org/specifications/geodetictiffgrids.html
>
Perhaps just change the "is" to "was" in the sentence starting with "The 
only instance we have in mind is ..."

Even

> Regards, Jochem
>
>
>
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