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 _______________________________________________ Qgis-user mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
