[Proj] Re: from EPSG:28992 to EPSG:25832

[Melita Kennedy]

Bart,

I haven't tried this, but try changing the signs of the rotation 
parameters of the datum transformation. 

The values as given appear to be for the "position vector" variant 
of a 7 parameter transformation. 

Melita

-----Original Message-----
>
>Date: Thu, 20 Mar 2008 16:29:18 +0100
>From: "Bart van den Eijnden (OSGIS)" <bartvde at osgis.nl>
>Subject: [Proj] from EPSG:28992 to EPSG:25832
>To: proj at lists.maptools.org
>
>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