[Proj] ToWGS84 for Germany, NRW?

[OvV_HN]

----- Original Message ----- 
From: "Bytechanger" <Bytechanger at gmx.de>
To: <proj at lists.maptools.org>
Sent: Thursday, October 15, 2009 3:30 PM
Subject: [Proj] ToWGS84 for Germany, NRW?


> Hi,
>
> I want to convert 4326 to 31466....
> But there is a difference of 50m !!
>
> I think I need right +towgs84 for Germany , NRW, Rhein-Erft-Kreis ??
>

If in doubt about parameters, one could consult:
Bezirksregierung Köln, GEObasis.nrw
For instance, the page:
http://www.lverma.nrw.de/produkte/raumbezug/koordinatentransformation/Koordinatentransformation.htm
Scroll down to perhaps:
"Die für Nordrhein-Westfalen durchschnittlichen Shiftparameter sind in den 
folgenden Tabellen aufgelistet: <Datumshiftparameter>"



Oscar van Vlijmen