[QGIS-Developer] Proj 7 auto grid download

Nyall Dawson nyall.dawson at gmail.com
Sun Mar 22 17:22:55 PDT 2020

On Fri, 20 Mar 2020 at 18:21, Andreas Neumann <a.neumann at carto.net> wrote:
> Hi, Jürgen,
> Thanks for explaining the situation. 500MB is definitely too large and
> it would be useless data for most users.
> Might it be an option to store grid-shift files alternatively also in
> the QGIS user directory - I mean the folder where the user stores his
> settings, plugins, expressions. I agree that many users wouldn't have
> access to the main install directory.

That's already possible, and it's how the "install grid" buttons work
(they copy to this folder)

> Alternatively, would it be possible to integrate an additional
> step/choice in the standalone installer that would download grid-shift
> files of interest for the user?

My issue is that 99% of modern GIS users (made up number, based on
personal experience alone) have no idea what a "grid shift file" is,
what it's used for, and the consequence of not having it. We'd have to
be very very careful in how we present any option like this, e.g.
don't mention "grid shift" at all, but instead something like
"localised support files".


> Thanks,
> Andreas
> Am 20.03.20 um 09:09 schrieb Jürgen E. Fischer:
> > Hi Andreas,
> >
> > On Fri, 20. Mar 2020 at 08:12:35 +0100, Andreas Neumann wrote:
> >> Isn't that potentially a quite large amount of data? Most QGIS users that I
> >> know mainly work in one country or region and only need one gridshift file.
> >> Of course there are exceptions.
> > Yes. proj-dev-data is >500MB (also containing two extra huge grids with of 80
> > MB & 73 MB each; the latter for just one state in Germany).
> >
> > Putting it in the regular proj directory from within QGIS might also not be
> > possible, when a regular user runs QGIS.  And internet access to download is
> > also not a given.
> >
> > In OSGeo4W this isn't a problem.  Downloading from within the standalone
> > installer could be an option, but that kind of ruins the point of having a
> > standalone installer.
> >
> >
> > Jürgen
> >
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