[Proj] from EPSG:28992 to EPSG:25832

[Bart van den Eijnden (OSGIS)]

Hi list,

why is the conversion from EPSG:28992 to EPSG:25832 not very accurate?

The official calculator from agrs.nl gives the following:

Original system RD and NAP
X 196197,31
Y 390964,35

Target system UTM(ETRS89)
Zone 32
Northing 5710439,825
Easting 290464,836

This is what I get with PROJ 4.6:

cs2cs -f %.9f +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889
+k=0.999908 +x_0=155000 +y_0=463000 +ellps=bessel +units=m
+towgs84=565.2369,50.0087,465.658,-0.406857330322398,0.350732676542563,-1.8703473836068,4.0812
+no_defs +to +proj=utm +zone=32 +ellps=GRS80 +units=m +no_defs
196197.31 390964.35
290505.483235725        5710539.888875010 0.000000000

Any ideas what could be causing this? Is there a correction grid involved (I
am no projections expert unfortunately ... ).

TIA.

Best regards,
Bart

--
Bart van den Eijnden
OSGIS, Open Source GIS
http://www.osgis.nl