[Qgis-user] Struggling with datum transformations and grid shift files

[Bernhard Ströbl]

Hi Andreas,

I always put a 0 (zero) as destination datum. I cannot explain it but it 
works when transforming with a grid. If I leave the destination datum 
empty the new record is not saved.

Bernhard

Am 04.10.2016 um 12:58 schrieb Neumann, Andreas:
> Hi,
>
> I am struggling in QGIS 2x with datum transformations.
>
> The manual is not explicit how to handle this correctly.
>
> Here are the steps I tried:
>
> 1. As far as I understand, I have to copy the gsb file to the directory
> where proj stores the gsb files, in my case "C:\Program
> Files\OSGeo4W64\share\proj". Alternatively, one could set another folder
> and adjust the PROJ_LIB env variable accordingly.
>
> 2. In "Settings" --> "Options" --> "CRS" I can define default datum
> transformations. I tried to enter 21781 (Source CRS), 2056 (Destination
> CRS), +nadgrids=CHENYX06a.gsb (Source datum transfomation). Destionation
> datum has been left empty.
>
> 3. I would expect that whenever this combination 21781 --> 2056 shows up
> that QGIS would ask me to pick one the defaults specified in 2.
>
> The problem is that 2. does not work. When I close the dialogue and
> reopen it, my modifications are gone ... and I never have the chance to
> select my datum transformation option.
>
> Can you help me what I am doing things wrong?
>
> Thank you,
>
> Andreas
>
>
>
>
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