Hi Andi
>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.
That should work
to 2. and 3. : In the option dialog, you enter the datum transformation
id of the datum transformation(s), not the proj parameter.
So to get from epsg:21781 to epsg:2056 with CHENYX06a.gsb, you enter:
Source crs: EPSG:21781
Destination crs: EPSG:2056,
Source datum transformation: 100001
Destination datum transformation: -1
An easier way to get to these numbers is to check the box 'Ask for datum
transformations if no default is defined'. Then add a layer in 21781 to
the map and transform it to 2056 on-the-fly. In the dialog asking for
the datum transformation, check 'Remember selection'. The entry will
then appear in the options dialog.
Regards,
Marco
On 10/04/16 12:58, Neumann, Andreas wrote:
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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--
Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
marco.hugentob...@sourcepole.ch http://www.sourcepole.ch
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