[Qgis-user] QGIS server: configuration of grid shift files for datum conversions

[Neumann, Andreas]

On the same topic: there are two different versions of the Swiss datum
grid shift files: 

chenyx06etrs.gsb and chenyx06a.gsb 

Seems like the first translates between european datum ETRS89 and CH1903
(the old system?) and the second translates between old and new version
of the SWISS coordinate system (CH1903 and CH1903+ - I assume EPSG:21781
and EPSG:2056). 

I assume I have to configure both for QGIS server? 

Does QGIS server use the same defintion that already exists in file
/usr/local/share/proj/CH ? 

Thanks, 

Andreas 

On 2016-10-24 08:23, Neumann, Andreas wrote:

> Hi, 
> 
> I have to configure QGIS server to properly handle grid shift files. In Switzerland we need to offer "old" and "new" coordinates (different datums) at the same time with our services and the conversion needs to be done with grid shift files or tin based interpolation. 
> 
> I know that I have to copy the CHENYX06a.gsb file to my proj lib, e.g. /usr/local/shar/proj  - but how can I make QGIS Server to actually use this file? I assume that I need to copy an additional config file or SRS/grid shift file combinations to QGIS server and/or specify an environment variable - right? 
> 
> Are there any resources explaining how I can configure QGIS server to make use of these grid shift files? 
> 
> Thank you for any pointers! 
> 
> Andreas
> 
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