[Mapbender-users] Projection to DHDN3 GK Zone3 EPSG:31467

[Leukert, Boris]

Hi Andreas,
I'm using the following entries to reproject from EPSG 31467 to UTM and it works fine:

PROJ.4 epsg file:
<31467> +proj=tmerc +lat_0=0 +lon_0=9 +k=1 +x_0=3500000 +y_0=0 +ellps=bessel +datum=potsdam +units=m +no_defs +nadgrids=/opt/libproj/share/proj/BETA2007.gsb +wktext  <>

PostGIS table spatial_ref_sys:
UPDATE spatial_ref_sys
   SET proj4text = '+proj=tmerc +lat_0=0 +lon_0=9 +k=1 +x_0=3500000 +y_0=0 +ellps=bessel +datum=potsdam +units=m +no_defs +nadgrids=/opt/libproj/share/proj/BETA2007.gsb +wktext '
 WHERE srid = 31467;

Please change the directory "/opt/libproj/share/proj/" to the directory of your installation where the file BETA2007.gsb is located.

Best regards,
Boris

-----Ursprüngliche Nachricht-----
Von: mapbender_users-bounces at lists.osgeo.org [mailto:mapbender_users-bounces at lists.osgeo.org] Im Auftrag von a.borgardt at landkreis-cuxhaven.de
Gesendet: Dienstag, 18. September 2012 13:20
An: mapbender_users at lists.osgeo.org
Betreff: [Mapbender-users] Projection to DHDN3 GK Zone3 EPSG:31467

Hi Mapbenders,

I'm trying to project a wms with the change epsg button. The function
works, but the resulting coordinates are not correct. They differ about
32m to west and about 175m to the south to a "real" dhdn-shape. I tried
two proj4-parameters in the spatial_ref_sys table for epsg 31467:

+proj=tmerc +lat_0=0 +lon_0=9 +k=1.000000 +x_0=3500000 +y_0=0
+ellps=bessel +datum=potsdam +units=m +no_defs
+proj=tmerc +lat_0=0 +lon_0=9 +k=1.000000 +x_0=3500000 +y_0=0
+ellps=bessel +datum=potsdam +nadgrids=BeTA2007 +units=m +no_defs  

but nothing changes.

Thanks for any help!

Best regards

Andreas

-- 
Dipl.-Geol. Andreas Borgardt
Landkreis Cuxhaven
06 - GIS-Service
Tel.: 04721/66 23 68
E-Mail: a.borgardt at landkreis-cuxhaven.de
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