[Qgis-user] Can't install / use NTv2 grid file.

[tomi_w]

Hello,
I've got some coordinates in a shape file in EPSG 31468 (DHDN / GK zone 4)
and I need them to be precisely transformed to WGS84 (for stakeout using  a
simple GNSS rover application). Local authorities are providing a NTv2 grid
file
(http://geodaten.bayern.de/oadownload/bvv_internet/kanu/BY-KanU_Oberfranken_Testdatei_vorlaeufig.zip),
which I have extracted and copied to /usr/share/proj/oberfranken.gsb . I'm
using QGIS 2.14.11-Essen on Linux. To transform and export the point data
from the aforementioned shape file, I'm doing the following steps:
Layers Panel -> my points layer -> Save as -> Select format CSV, Select file
name, Select CRS EPSG 4326 (WGS84) -> Ok. Then comes a list of four
transformations available:
+towgs84=598.1,73.7,418.2,0.202,0.045,-2.455,6.7
+nadgrids=BETA2007.gsb
+towgs84=582,105,414,1.04,0.35,-3.08,8.3
+towgs84=612.4,77,440.2,-0.054,0.057,-2.797,2.55
I'm missing my previously installed gsb file though. What's going wrong, why
is this transformation not listed there?
How would I go about getting more detailed information on this problem?
Btw. "Ask for datum transformations when no default is defined" is set. The
new gsb file is quite big (350MB), but has exactly the same permissions as
anything else in /usr/share/proj.

I would really appreciate your help!
Thanks in advance!
 Thomas



--
Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-User-f4125267.html