Steve In newer versions of the WKT definition there is sometimes a TOWGS84[...] tag included which contains the 7 shifting parameters, but I don't know if this is already a standard notation and if GDAL automatically takes this into account when found.
What should normally work is to use the Proj4 notation which includes the tag +towgs84=..... and then define the projection via the method ImportFromProj4() armin -------- Original-Nachricht -------- > Datum: Mon, 9 May 2011 20:07:23 -0700 (PDT) > Von: srweal <[email protected]> > An: [email protected] > Betreff: [gdal-dev] Datum Shifts with OSR.CoordinateTransform > Hi all, > > I'm using the C# wrapper and GDAL/OGR binaries from Tamas' repository > (http://vbkto.dyndns.org:1280/sdk/) and am trying to do coordinate > transformation that includes a datum shift on a geometry. > > I'm wanting to understand how I can control what shift parameters are used > when calling the MyGeometry.Transform(MyTransform) method. > > I have been creating the CoordinateTransform by using the basic > constructor > (i.e. new CoordinateTransform(SourceSR, TargetSR)) but this doesn't give > me > any control over the shift. Do I need to define the shift parameters on > the > actual SourceSR and TargetSR? If so, how is this best done. > > Currently I'm creating the SourceSR via the ImportFromWkt() method and > obtaining the WKT from spatialreference.org. > > Thanks for any advice, examples or links you can provide with more > information. > > Steve > > -- > View this message in context: > http://osgeo-org.1803224.n2.nabble.com/Datum-Shifts-with-OSR-CoordinateTransform-tp6346391p6346391.html > Sent from the GDAL - Dev mailing list archive at Nabble.com. > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
