[Proj] Need a working PROJ4 string for the dutch grid

Jan Hartmann j.l.h.hartmann at uva.nl
Tue Mar 14 10:37:00 EST 2006

Roger Oberholtzer wrote:
> On Thu, 2006-03-09 at 22:45 -0800, Paul Meems wrote:
>>I've got some trouble finding a working PROJ4 string for the dutch grid.
>>I'm on the developing team of MapWindow ( www.mapwindow.org ) and we use
>>PROJ4 for our (re)projection. The most projections work fine but the one I'm
>>interesting in the Dutch Grid projection (I live in The Netherlands) isn't
>>working correctly.
>>Does anybody knows the working PROJ4 string?
> When converting from WGS84 lat/longs, (like from a GPS) I use:
> +proj=latlong +ellps=WGS84 +to +proj=sterea +lat_0=52.15616055555555
> +lon_0=5.38763888888889 +k=0.9999079 +x_0=155000 +y_0=463000
> +ellps=bessel +units=m +no_defs

Note that the  proj  program  is  limited to converting coordinates 
within one datum. Conversion from WGS84 latlong to Dutch RD needs a 
datum shift from the Dutch Bessel ellipsoid to WGS84. The above 
transformation does not include this shift and gives errors up to 200 m. 
A more precise transformation is possible with "cs2cs" and the following 

+proj=latlong +datum=WGS84 +to +proj=sterea +lat_0=52.15616055555555 
+lon_0=5.38763888888889 +k=0.999908 +x_0=155000 +y_0=463000 
+ellps=bessel +units=m +no_defs 

This reduces errors to 25 cm at most, due to slight irregularities in 
the Dutch grid. See the documentation in the download section of 


More information about the Proj mailing list