[Proj] proj and Dutch RD

[Paul Kelly]

Martin Vermeer wrote:
> On Wed, Jan 11, 2006 at 10:09:39AM -0800, Eric Miller wrote:
> 
>>Here's a source listing 3-parameter values for transforming between WGS84 and RD: http://kartoweb.itc.nl/geometrics/Reference%20surfaces/DATUM.txt
>>
>>"""
>>Rijks Driehoeksmeting=Bessel 1841,-593,-26,-478,Netherlands
>>"""
>>
>>I've no idea if the signs needs to be changed or what the source is...  Caveat lector!
>>
>>Theoretically you can use the +towgs84 argument to apply the datum transformation.
> 
> 
> Yes of course... you need the correct translation vector. The Bessel
> ellipsoid is non-geocentric!
> 
> Forget my suggestion of using bessel as the 'from' ellipsoid. It should
> be wgs84 with proper shift added.

GRASS uses
towgs84=565.036,49.914,465.839,-0.4094,0.3597,-1.86854,-4.0772 for the
Netherlands
(http://freegis.org/cgi-bin/viewcvs.cgi/*checkout*/grass6/lib/gis/datumtransform.table)

Perhaps useful.