AW: [Proj] DHDN / Gauss Krueger to WGS84

[Dean Mikkelsen]

Hi Oliver,
 
No question is ever dumb. If no one ever asks, no one can ever learn.
 
A technical definition from Wikipedia states:
 
"The European Terrestrial Reference System 1989, usually referred to as ETRS89, is a three-dimensional geodetic frame of reference - a mapping coordinate system used as the standard high accuracy system for GPS in Europe.
 
It coincided with the World Geodetic System 1984 in 1989, hence the name, and is based on the same GRS80 ellipsoid. Unlike WGS84 or ITRS it is centred on Europe and diverges from them with the movements of the tectonic plates associated with this landmass."
 
Please see: http://en.wikipedia.org/wiki/ETRS89 for ETRS89
                 and  http://en.wikipedia.org/wiki/World_Geodetic_System_1984 for WGS84
 
These are some pretty good description of some systems used in Geodesy.
 
Cheers,
Dean
 
 

----- Original Message -----
From: Oliver Eichler <oliver.eichler at dspsolutions.de>
Date: Friday, September 21, 2007 8:59 am
Subject: Re: AW: [Proj] DHDN / Gauss Krueger to WGS84
To: "PROJ.4 and general Projections Discussions" <proj at lists.maptools.org>

> uwe.schmitz at lverma.nrw.de wrote:
> > please take a look at 
> > 
> http://crs.bkg.bund.de/crseu/crs/descrtrans/BeTA/de_dhdn2etrs_beta.php>
> > There you will find information about a "standard" solution 
> > for your problem. The documentation gives a brief example
> > for using PROJ.4. (I think, the german language isn't a problem
> > for you :-)).
> >
> > If you have any problems, please let me know.
> >
> >   
> Hi Uwe
> 
> Ok, had a look at it. Maybe it's a dump question (I am really not
> professional in this area) but as my target datum is WGS84 
> shouldn't I
> use different shift factors than for ETRS89?
> 
> Or is the shift from ETRS89 to WGS84 independent from the actual
> location? Google gives me the impression that it is.
> 
> Oliver
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> 

Dean C. Mikkelsen, B.Sc., P.Eng.
Terra ETL Ltd.
Mobile/Cellphone: +1 250 361 6672
E-mail: dcmikkelsen at shaw.ca

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