[PROJ] About the existence of the misc data files

[Even Rouault]

Peter,

> I was curious about something regarding the loose data files that are 
> built alongside proj.db:
Nitpicking: they aren't "built", at most just present & installed.  
Details below:
>
> alaska                      ==> no longer shipped with PROJ since a 
> long time. Some binary distributions might still ship it as part of 
> nostalgia/inertia, but no longer at 
> https://github.com/OSGeo/PROJ/tree/master/data. It is in the proj-data 
> as a GeoTIFF grid now
> BETA2007.gsb         ==> same as above
> conus                      ==> same as above
> egm96_15.gtx         ==> same as above
> GL27                       ==> still shipped with PROJ. Mostly/only legacy
> ITRF2000                ==> still shipped with PROJ. Can be used in 
> some cases for advanced users creating PROJ pipelines referencing ITRF 
> transformations, like "+proj=pipeline ... +step +init=ITRF2000:ITRF96 
> ...."
> MD                          ==> same as above about grids
> nad27                     ==> still shipped with PROJ. Mostly/only legacy
> nad83                    ==> still shipped with PROJ. Mostly/only legacy
> ntf_r93.gsb            ==> same as above about grids
> ntv1_can.dat        ==> same as above about grids
> ntv2_0.gsb            ==> same as above about grids
>
> What exactly wouldn't work if these particular files weren't 
> available? Are these superseded by something in the new and improved 
> geotiffs in proj-data?
For the grids, yes they are all deprecated by the GeoTIFFs of proj-data
> Or would the average user not even notice they were gone?

For the other parts, only the most enlightened minds would notice.

Even

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