AW: [gdal-dev] Re: ogr2ogr BeTA2007 grid

[Schmitz, Uwe]

Tilo,

> > 
> > ogr2ogr -s_srs "+proj=tmerc +lat_0=0 +lon_0=9 +k=1 +y_0=0 
> +ellps=bessel 
> > +nadgrids=BETA2007.gsb" -t_srs EPSG:25832 target.shp source.shp
> 
> I used the parameters instead, but it didn't work either. In 
> fact, I think it doesn't matter since ogr2ogr looks up the 
> same parameters in its EPSG file and converts the whole 
> string to WKT anyway. So the result should be the same.
> 
> Any other thoughts?

please try to verify that the grid is read. 
Therefore set the environment variable
PROJ_DEBUG before running ogr2org, e.g. (Windows cmd):

set PROJ_DEBUG=1

Then you see if the grid is accessed at all.

FYI, here is my setup for transforming coordinates
with cs2cs from german "Gauss-Krueger stripe 3/DHDN" to 
"UTM Zone 32N/ETRS89"):

cs2cs \
      +proj=tmerc \
      +lat_0=0 \
      +lon_0=9 \
      +k=1.0 \
      +x_0=3500000 \
      +y_0=0 \
      +ellps=bessel \
      +units=m \
      +nadgrids=BETA2007.gsb \
   +to \
      +proj=utm \
      +ellps=GRS80 \
      +towgs84=0,0,0 \
      +zone=32

Hope that helps.
Uwe