[Proj] converting WGS84/ETRS89 to ITM/OSGM15

[Elmir Jagudin]

On Wed, Aug 22, 2018 at 12:27 PM Even Rouault <even.rouault at spatialys.com>
wrote:

> Alain,
>
> > Doing the same way you try
> > this (with proj program) I can’t get the correct use of the GeoidGrid.
> > Why????
>
> proj is the historical command line utility at the time where the library
> only
> handled cartographic projections, but not datum transformations hence it
> ignores +towgs84, +nadgrids, +geoidgrids. For the later, you need to use
> cs2s
>
> Even
>

Ok, this explains why +geoidgrids never worked.

It's a bit of a pitfall, maybe a warning should be in order?

/Elmir
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