[gdal-dev] Force application of ntv2 grid

[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?

Any help would be greatly appreciated.

Best regards,
Jeremy


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