[Proj] Conversion from WGS84 to UTM31

[Fabien Brachere]

Le mardi 28 février 2006 à 13:25 +0200, Martin Vermeer a écrit :
> On Tue, 2006-02-28 at 11:42 +0100, Fabien Brachere wrote:
> 
> Hello ,
> I'm trying to convert data from my GPS to UTM31 coordinates and I use
> something like that:
> 
> ./cs2cs -v +init=epsg:4326 +to +init=epsg:23031
> 
> Surely there must be a datum offset... UTM31 coordinates on the
> international ellipsoid sounds like a terrestrial, non-geocentric datum,
> even if the <23031> entry doesn't provide one. 100 m sounds about right.
> 
> - Martin

Thank you Martin, I think the datum is ED50 but I don't know how to
apply the offset, with towgs84 parameter or a grid ? If yes, do you know
where I can find the datum offset or the grid ?


-- 
Fabien Brachere <fabien.brachere at eikonex.net>
Eikonex