[gdal-dev] transformation with nadgrids

[Wolfgang Lahr]

Hello list,

I am using GDAL/OGR to transform raster and vector data from German
Gauss-Krueger (DHDN) to ETRS/UTM like so:

gdalwarp/ogr2ogr -s_srs "+proj=tmerc +lat_0=0 +lon_0=9 +k=1.000000 +x_0=3500000 +y_0=0 +ellps=bessel +units=m +nadgrids=./HeTa2010.gsb +wktext"
-t_srs "+proj=utm +zone=32 +ellps=GRS80 +datum=WGS84 +units=m" ...

This works very well (Kudos to Frank and co-developers!!).

Now, the question came up, how to do it just the other way round, ie from
ETRS/UTM to Gauss-Krueger (DHDN) using the same grid.

Any hints?

Regards and thanks

Wolfgang