Hi,
Can anybody help with this? I have latitude and longitude(34.7473139,
45.0638444) for a shot point. When I used WGS84 to generate segp file I
got about 98 meters difference for "Easting" value comparing with the
original segp file. The following is the fragment of the codes. All
classes I used are from geoapi-nogenerics-2.1-M2.jar. Did I use the
wrong classes? Thanks very much.
CRSAuthorityFactory crsFactory =
FactoryFinder.getCRSAuthorityFactory("EPSG", null);
CoordinateReferenceSystem crs =
crsFactory.createCoordinateReferenceSystem("WGS 84 / UTM zone 38N");
CoordinateReferenceSystem crsNad27 =
crsFactory.createCoordinateReferenceSystem("NAD27");
DirectPosition pt1 = new GeneralDirectPosition(34.7473139, 45.0638444);
((GeneralDirectPosition)pt1).setCoordinateReferenceSystem(crsNad27);
GeotoolsCoordinateConverter converter = new
GeotoolsCoordinateConverter(); --- my class implementing
CoordinateConverter
DirectPosition pt2 = converter.convert(pt1, crs);
System.out.println(pt2); -------------------- The result I got is
(505,942.407 3,844,897.644); but the value from original segp file is
(505,843.7 3,845,023.5), almost 100 meters difference. This
difference is very big.
public class GeotoolsCoordinateConverter implements CoordinateConverter
{
protected CoordinateOperationFactory coFactory;
public GeotoolsCoordinateConverter()
{
coFactory = FactoryFinder.getCoordinateOperationFactory(null);
}
public DirectPosition convert(DirectPosition pt,
CoordinateReferenceSystem toCrs)
{
CoordinateOperation transform = null;
try
{
transform =
coFactory.createOperation(pt.getCoordinateReferenceSystem(), toCrs);
}
catch (OperationNotFoundException e)
{ e.printStackTrace(); }
catch (FactoryException e)
{ e.printStackTrace(); }
MathTransform trans = transform.getMathTransform();
DirectPosition pt2 = null;
try
{ pt2 = trans.transform(pt, null); }
catch (MismatchedDimensionException e)
{ e.printStackTrace(); }
catch (TransformException e)
{ e.printStackTrace(); }
return pt2;
}
}
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
Geotools-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/geotools-devel
