[gdal-dev] transformation with nadgrids

[Ralf Suhr]

Hi Wolfgang,

is gdalwarp/ogr2ogr -t_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" -
s_srs "+proj=utm +zone=32 +ellps=GRS80 +datum=WGS84 +units=m" ... not working 
for you?

The default EPSG:25832 can also be written as "+proj=tmerc +lat_0=0 +lon_0=9 
+k=0.9996 +x_0=500000 +y_0=0 +ellps=WGS84 +units=m +wktext"

Gr
Ralf

Am Montag 13 Dezember 2010, 12:07:51 schrieb 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
> 
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