[PROJ] About the existence of the misc data files

[Peter Townsend]

Thanks, that's very helpful info!

On Thu, Dec 12, 2024 at 4:44 PM Even Rouault <even.rouault at spatialys.com>
wrote:

> 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 Are these superseded by something in the new and improved geotiffs in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
>
> -- http://www.spatialys.com
> My software is free, but my time generally not.
> Butcher of all kinds of standards, open or closed formats. At the end, this is just about bytes.
>
>

-- 
Peter Townsend
Senior Software Developer
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