[Proj] proj and Dutch RD

Oscar van Vlijmen ovv at hetnet.nl
Wed Oct 18 08:21:35 EDT 2006

> From: tvijlbrief
> Date: Tue, 17 Oct 2006 02:35:53 -0700 (PDT)
> To: proj at lists.maptools.org
> Subject: Re: [Proj] proj and Dutch RD
> Much confusion, but the following definition will work! I submitted this
> as a patch for the epsg file to the libproj maintainers.
> <28992> +proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889
> +k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel
> +towgs84=565.040,49.910,465.840,-0.40939,0.35971,-1.86849,4.0772 +units=m
> +no_defs  <>
> For some reason Oscar van Vlijmen's conversion:
> Transformation from Bessel 1841 to WGS84:
> dx=565.040; dy=49.910; dz=465.840; rx=0.40939; ry=-0.35971; rz=1.86849;
> ds=4.0772;
> had the sign of rx,ry and rz reversed!
> Tom

My posting with subject "Re: [Proj] OSGB36", dated 2006-01-13, contained the
following addendum:

By the way, in my previous email with subject "Re: [Proj] proj and Dutch RD"
I forgot to mention that the datum transformation parameters are coordinate
frame parameters, so the signs of the r's should be reversed if you want to
use the parameters for a position vector transform like PROJ.4's.

Sorry, some information comes in parts, even not 'thread safe'!

More information about the Proj mailing list