[Proj] *SOLVED*: Creating a nadgrid shift file with GDAL

[Andre Joost]

Am 22.01.2013 17:11, schrieb Jan Hartmann:
>

> I think you are right (Hermann Peifer pointed out the same thing). I do
> not understand your reference to epsg:4289, though: that epsg number has
> a wgs84 shift. The original ellipsoid for Amersfoort is jus Bessel, so
> the source latlon epsg would be 4308

If you transform from EPSG:28991 to EPSG:4289, both have the same 
towgs84 parameters. So thats the same as calculating without any towgs84 
shift, but easier to handle with cs2cs. Its just to make clear that we 
still are on the same ellipsoid, located at the Amersfoort datum. About 
700m away from the WGS84 ellipsoids center.

Greetings,
André Joost