[Proj] from EPSG:28992 to EPSG:25832

[Frank Warmerdam]

Bart van den Eijnden (OSGIS) wrote:
> An update on this issue after I had some contact with Jan Hartmann.
> 
> There is something strange going on in our opinion, the same command 
> yields different results in PROJ 4.5 and 4.6. PROJ 4.5 is very close to 
> the expected result.
> 
> 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
> 96197.31 390964.35
> 290505.483235725        5710539.888875010 0.000000000
> 
> PROJ 4.5:
> 290464.957702205        5710439.900326397 44.377755052
> 
> If Jan changes the ellipsoid of the UTM zone from GRS80 to WGS84 things 
> are okay in PROJ 4.6.
> 
> Can somebody shed some light on this? Did something changes with the 
> ellipsoids? How can different PROJ versions yield different results on 
> the same command?

Bart,

In PROJ 4.6.0 no datum shift is applied if either the source or
destination coordinate system have datum definitions.

I would suggest using

   +proj=utm +zone=32 +ellps=GRS80 +units=m +towgs84=0,0,0 +no_defs

for the output coordinate system.

Best regards,
-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | President OSGeo, http://osgeo.org