[Proj] proj and Dutch RD

[Eric Miller]

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.

>>> roger at opq.se 1/11/2006 8:17 AM >>>
On Wed, 2006-01-11 at 10:56 -0500, Gerald I. Evenden wrote:
> On Wednesday 11 January 2006 09:31 am, Roger Oberholtzer wrote:
> > I am trying to use proj on a Dutch project using 'RD'. I have
> > encountered a problem.
> >
> > I am trying the command:
> >
> > 	cs2cs -r +proj=latlong +ellps=WGS84 +to +proj=stere
> > +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.9999079
> > +x_0=155000 +y_0=463000 +ellps=bessel +units=m +no_defs
> 	...
> 	Seeing the "Double Stereographic" below I feel that you should be using
> +proj=sterea rather than than the American or Snyder stere.

If I use sterea, and set the input ellipse to bessel rather than wgs84,
my calculated values are almost exactly the same (> 0.001 meters error).
Yeah!

-- 
Roger Oberholtzer
OPQ Systems AB


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