Hi Jean Here is what I kind of do; I use the CoordinateReferenceSystem created my WKT to look up the "Real" CoordinateReferenceSystem produced by the EPSG database (which is much more complete).
There is an "Equals" method that ignores metadata to assist you with this; and because I find CoordinateReferenceSystem stuff difficult to manage by hand there should be a helper method ... Yes there is - indeed it is one of the use-cases covered by the user guide: - http://docs.codehaus.org/display/GEOTDOC/01+CRS+Helper+Class#01CRSHelperClass-SearchingforaCoordinateReferenceSystem Cheers, Jody On 13/05/2010, at 3:15 AM, Jean Marie wrote: > Hello > > my purpose is to get a list of projection systems described in a WKT format > (so using gt-epsg-hsql-2.6.3) ; > and then to use these WKT representations to achieve tranformations using > only > the library gt-referencing-2.6.3.jar > > to get these WKT strings I use the following code : > > CoordinateReferenceSystem crsSrc = > ReferencingFactoryFinder.getCRSAuthorityFactory("EPSG", > null).createCoordinateReferenceSystem(EPSG); > and then crsSrc.toWKT() gives the WKT specification for EPSG > > I took 3 WKT representations for respectively EPSG = "EPSG:4326", EPSG = > "EPSG:2056" and EPSG = "EPSG:27572" > then I created for each one a CoordinateOperationFactory object to carry out > 2 transformations : > one from 4326 to 2056 (Switzerland) et the other from 4326 to 27572 (France) > using the WKT strings > > I noticed that the WGS84 to Swiss transformation is correct, > while the WGS84 to French transformation generates an error saying that > Bursa-Wolf parameters are required ; > > I would like to know how to sort out this problem as I need accurate results > and I cannot afford to use the following code involving some transformation > errors: > > CRS.findMathTransform(crsSrc, crsDest, true) > > is it possible to get Bursa-Wolf parameters in each WKT representation ? > > thanks a lot > > Jean-Marie > > Vous voulez protéger votre vie privée ? La solution avec Internet Explorer 8 > ------------------------------------------------------------------------------ > > _______________________________________________ > Geotools-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geotools-devel
------------------------------------------------------------------------------
_______________________________________________ Geotools-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-devel
