[gdal-dev] PROJ Data

[Alan Snow]

Here is a helpful reference:
https://proj.org/resource_files.html#transformation-grids

On Wed, Feb 8, 2023, 3:43 PM Scott Arnold <scottcarnold2 at gmail.com> wrote:

>  Greetings GDAL Community,
>
> I've been working with GDAL lately, and I have a question for more
> experienced GDAL users or developers.  GDAL has a dependency on PROJ.  I
> know some GDAL functions, for example, will respond with an error message
> if the proj.db cannot be found, and there is a dependency on PROJ during
> the GDAL build.  PROJ has a rather large collection of data packaged
> separately from the PROJ source code (described in PROJ-data readme as
> containing shift grids for horizontal and vertical coordinate
> transformations.). You can build both PROJ and GDAL without PROJ data, and
> the GDAL functions I've used (albeit I've only used a few) seem unaffected
> by not having PROJ data.  Can any of you provide any insights into what the
> implications are of having PROJ data installed vs. not installed?
>
> Thank you,
>
> Scott Arnold
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