[Proj] Long/Lat -> Gauss-Krueger, wrong coordinates?!

Ole Rahn O.Rahn at fh-osnabrueck.de
Wed Nov 24 05:13:50 EST 2004


I'm sure I'm doing something obvious wrong, but I just don't see it...

I have got a problem projecting some coordinates form a 
longitude/lattitude (WGS84) coordinate system to Gauss-Krueger Zone 3 
projection using proj:
The resulting (Gauss-Krueger) coordinates are not what they should be 
according to my reference dataset. They seem to be about 150 and 70 
meters off in North and East direction.

The parameters I supply proj with are:
"+proj=tmerc +lat_0=0 +lon_0=9 +k=1.000000 +x_0=3500000 +y_0=0 
+ellps=bessel +units=m no_defs" (to translate the WGS84 coordinates to 
GK Zone 3)

(As far as I know I don't have to reproject the WGS84 coordinates to 
something else, because Proj uses WGS84 (= no projection) as "base 
format" - right?)

I got those parameters from an EPSG-list  (EPSG 31463 - "DHDN / 3-degree 
Gauss zone 3"), so they appear to be right to me...

If I use this projection parameters, the coordinates of e.g. a point 
change as follows:
original coordinates: 8.05864684 (east), 52.322994 (north)
resulting GK coords: 3435824.638, 5799103.492
but they should be something like: 3435898, 5799265

What am I doing wrong??
Any other suggestions or hints?

Thank you in advance!


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