Am 29.11.2013 09:59, schrieb Jeremy Palmer:
Hi gdal-devs,
I'm trying to shift shapefile data using a custom NTv2 grid file. The
logical source and destination coordinate systems are the same
(geographic coordinates EPSG:4167), I only want to shift the data.
The type of command I'm trying to run is:
ogr2ogr -f "Esri Shapefile" -a_srs "+proj=longlat +ellps=GRS80"
-t_srs "+proj=longlat +ellps=GRS80 +nadgrids=custom_grid.gsb +wktext"
dst_datasource_name src_datasource_name
but the output shapefile does not get transformed...
Is this because there is a short circuit in proj4 if the ellipsoids
are the same?
No, you have to explicitely specify +towgs84=0,0,0,0,0,0,0 for the first
srs. Otherwise it is assumed that both share the same datum.
HTH,
André Joost
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