[Proj] Datum shifts in PROJ's EPSG table (The Netherlands and Belgium)

Oscar van Vlijmen ovv at hetnet.nl
Thu Oct 26 10:17:20 EDT 2006

> From: Jan Hartmann
> Date: Thu, 26 Oct 2006 11:20:34 +0200
> Subject: [Proj] Datum shifts in PROJ's EPSG table (The Netherlands and
> Belgium)

> In that case I would like to submit the Datum shifts for the Netherlands
> and Belgium for inclusion in the epsg table. They are described in the
> following postings:
> http://postgis.refractions.net/pipermail/postgis-users/2005-November/009894.ht
> ml 
> http://postgis.refractions.net/pipermail/postgis-users/2006-October/013570.htm
> l 
> The Dutch parameters have been confirmed by the cadastral service;

Thanks for mentioning this. I still used the post-2000, but pre-2004
parameters which are no longer valid since 2006-01-01.

The EPSG database itself has the Dutch RD 2004 transformation parameters
under coordinate operation 15739. For some reason they were not converted to
the PROJ epsg file, but Frank just mentioned epsg number 4289. Here the
translation figures are rounded to 3 decimals.

I did a bit of web searching and it appears to me that the Dutch Kadaster
doesn't want the new transformation procedures and parameters from
RDNAPTRANS 2004 to be published.
You can download a file rdnaptrans.zip with code, grid data, tests and
explanations from the download page at <http://www.rdnap.nl/> but you'll
have to ask for a password to deflate the zip file.
The Transformator from the Kadaster still uses the old stuff.
All non-protected information pages still describe the old procedures &
parameters; for instance:
"Coördinaattransformaties en kaartprojecties", Ministerie van Verkeer en
Waterstaat, Meetkundige Dienst

Apparently this reservedness serves some purpose.

I suppose the "confirmed" transformation:

a more accurate definition for the Dutch system is:
+proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889
+k=0.999908 +x_0=155000 +y_0=463000 +ellps=bessel  +units=m
+no_defs +to +proj=latlong +datum=WGS84

mentioned on:
is derived from the RDNAPTRANS 2004 procedures.

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