A CoordinateReferenceSystem generated from "raw" WKT:
- Often does not have an EPSG code. These codes are useful to know when working with data from a range of sources. If we can figure out the code we can construct a WMS GetMap request (for a base map layer) that matches the shapefile.
- Often lacks some of the meta-data used when creating a good MathTransform
- Construct a CoordinateReferenceSystem based on what you have.
String name = "ED50";
String wkt =
"GEOGCS[\"" + name + "\",\n" +
" DATUM[\"European Datum 1950\",\n" +
" SPHEROID[\"International 1924\", 6378388.0, 297.0]],\n" +
"PRIMEM[\"Greenwich\", 0.0],\n" +
"UNIT[\"degree\", 0.017453292519943295]]";
CoordianteReferenceSystem example = CRS.parseWKT(wkt); - Find the Identifier for your CoordinateReferenceSystem
String code = CRS.lookupIdentifier( example, true ); // should be "EPSG:4230
- Look up the official definition for that Identifier
CoordinateReferenceSystem crs = CRS.decode( code );
If you do have any trouble - set the lenient flag to false, the transform will no longer be as accurate (as WKT by itself does not have enough information to account for datum shifts etc...).CoordianteReferenceSystem wsg84 = CRS.decode( "EPSG:4326" );
MathTransform transform = CRS.findMathTransform(crs, wsg84, true);
Geometry targetGeometry = JTS.transform( sourceGeometry, transform );
Documentation harmed in the making of this post:CoordianteReferenceSystem wsg84 = CRS.decode( "EPSG:4326" );
MathTransform transform = CRS.findMathTransform(example, wsg84, false );
Geometry targetGeometry = JTS.transform( sourceGeometry, transform );
- CRS Helper Class (GeoTools User Guide)
- JTS Helper Class (GeoTools User Guide)
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