[GRASS-dev] GRASS GIS ready for PROJ 7?

[Markus Metz]

On Fri, Mar 5, 2021 at 8:11 PM Helmut Kudrnovsky <hellik at web.de> wrote:
>
> Hi devs,
>
> in OSGeo4W actually:
>
> C:\>proj --version
> Rel. 6.3.2, May 1st, 2020
>
> OSGeo4W next generation is in a testing phase at the moment.
>
> one of the biggest steps forward is:
>
> >PROJ 7.2 <=
>
> is GRASS GIS ready for PROJ 7?

Yes, insofar that GRASS 7.8+9 compile and run fine with PROJ 7, but...

>
> in PROJ7, there is a complete change how PROJ related/needed data is
> handled:
>
> (1) dynamically via https://cdn.proj.org/
> (2) via a revamped proj-data with file size of more than 500 MB
>
> * will GRASS be ready to handle it dynamically via CDN?
> * including more than 500MB data into our standalone installer may
explode our used NSIS system.

this new functionality of PROJ 7+ is not yet used in GRASS.

We need to introduce a mechanism where users can switch on and off dynamic
download of PROJ-related data. Depending on the available internet
connection (none, too slow, too expensive), automated download might need
to be disabled, in which case we need to introduce warnings that
PROJ-related data are missing for certain coordinate operations.

Markus M

>
> kind regards
> Helmut
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