On Wed, May 12, 2010 at 9:36 AM, Jean Marie <[email protected]> wrote: > looking in details at the way I get the WKT string, I notice that sometimes > this string contains the Bursa-Wolf parameters and sometimes it doesn't ; > Bursa-Wolf parameters seems related to the presence of parameter TOWGS84[..] > > to get this WKT string I write the following code : > > CoordinateReferenceSystem crsSrc = > ReferencingFactoryFinder.getCRSAuthorityFactory("EPSG", > null).createCoordinateReferenceSystem(EPSGsrc); > and then crsSrc.toWKT() gives the WKT specification for EPSGsrc > > if EPSGsrc="EPSG:2056" (Liechtenstein and Switzerland) I do get the > parameter TOWGS84[..] in the WKT string > and then the library gt-epsg-hsql-2.6.3.jar is not required and the use of > WKT projections is correct > (as described in my code at the bottom of this email)) > > if EPSGsrc="EPSG:27572" (France) I don't get parameter TOWGS84[..] and the > library gt-epsg-hsql-2.6.3.jar is required > > so my question is : > how can I get a complete and an accurate WKT string from a given EPSG code ?
http://spatialreference.org/ref/epsg/27572/ seems to give the TOWS string as TOWGS84[-168,-60,320,0,0,0,0], I thought you always needed an EPSG implementation jar to be present when using GeoTools to do any CRS work but I haven't played with projections for a while. Ian -- Ian Turton ------------------------------------------------------------------------------ _______________________________________________ Geotools-gt2-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
