[GRASS-dev] PROJ6 support in GRASS

Markus Metz markus.metz.giswork at gmail.com
Fri Nov 8 10:39:09 PST 2019

On Fri, Nov 8, 2019 at 10:15 AM Martin Landa <landa.martin at gmail.com> wrote:
> Hi,
> pá 8. 11. 2019 v 8:22 odesílatel Markus Metz
> <markus.metz.giswork at gmail.com> napsal:
> > > I will try to reword my question. Are you aware of any related
> > > blockers which should avoid us packaging upcoming GRASS 7.8.1 with
> > > GDAL3/Proj6? Thanks for clarification! Martin
> >
> > No, that's the only bug I found so far.
> thanks for clarification! In that case let's release 7.8.1 ASAP in
> order to allow OSGeo4W switch to GDAL3/PROJ6.

the EPSG:3857 (Web Mercator) bug has been fixed in master 4167542. Is there
still time to backport to relbr78?

It is pure chance that the previous method worked, this is a fix for the
GRASS hack to deal with "the hacky way of encodign webmerc in GDAL WKT1" to
cite PROJ 6.

All this trouble because +proj=webmerc exists only since PROJ 5.1.0, and
because even GDAL 3 and PROJ 6 (at least PROJ 6 knows +proj=webmerc) still
report "+proj=merc +a=6378137 +b=6378137 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0
+k=1 +units=m +nadgrids=@null +wktext +no_defs" as a workaround.

Markus M
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