Dear dev team,
Shall I open an issue in the issue tracker for this? Or is it a user
misunderstanding that I am expecting the referencing module to handle
transformation from 2D to 3D CRS by simply adding doing a 2D
transformation and adding a zero value for Z-axis value?
On 02/14/2011 10:52 AM, Farrukh Najmi wrote:
Hi Javier,
Thanks for sharing your transformation code. It seems to be
transforming JTS Coordinate whereas I am looking to transform JTS
Geometry.
Here is the code I am using based on the gt-referencing module's
JTS.transform() method...
Geomtry sourceGeometry = ...
CoordinateReferenceSystem sourceCRS =
CRS.decode("EPSG:4326");
CoordinateReferenceSystem targetCRS =
CRS.decode("EPSG:4979");
MathTransform transform =
CRS.findMathTransform(sourceCRS, internalCRS, true);
Geometry targetGeometry = JTS.transform(
sourceGeometry, transform);
targetGeometry.setSRID(4979);
I would like to find a solution that is leveraging gt-referencing
module's JTS.transform() method as much as possible.
Thanks for any suggestions.
On 02/14/2011 10:21 AM, Javier Moreno wrote:
I'm not using postgresql epsg but maybe the code I use to reproject
will be useful to you. Just in case:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package edu.ub.bio.wms;
import com.vividsolutions.jts.geom.Coordinate;
import edu.ub.bio.framework.SystemException;
import edu.ub.bio.wms.datasources.DBConnectionFactory;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.geotools.geometry.jts.JTS;
import org.geotools.referencing.CRS;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.NoSuchAuthorityCodeException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.opengis.referencing.operation.MathTransform;
import org.opengis.referencing.operation.TransformException;
/**
*
* @author ciberado
*/
public class CoordinateTransformationService {
private CoordinateReferenceSystem sourceCRS;
private CoordinateReferenceSystem targetCRS;
public CoordinateTransformationService() {
try {
sourceCRS = CRS.decode("EPSG:27573");
targetCRS = CRS.decode("EPSG:4326");
} catch (NoSuchAuthorityCodeException ex) {
throw new SystemException(ex);
} catch (FactoryException ex) {
throw new SystemException(ex);
}
}
private Coordinate transform(double x, double y) {
try {
MathTransform transform =
CRS.findMathTransform(sourceCRS, targetCRS);
Coordinate source = new Coordinate(x, y);
Coordinate destination = new Coordinate();
JTS.transform(source, destination, transform);
return destination;
} catch (TransformException ex) {
throw new SystemException(ex);
} catch (FactoryException ex) {
throw new SystemException(ex);
}
}
public static void main(String[] args) {
CoordinateTransformationService cts =
new CoordinateTransformationService();
System.out.println(cts.transform("3 526 32"));
}
}
On Mon, Feb 14, 2011 at 4:14 PM, Farrukh Najmi
<farr...@wellfleetsoftware.com
<mailto:farr...@wellfleetsoftware.com>> wrote:
I am using a PostGres/PostGIS 8.3 database with gt-epsg-postgresql
plugin. The EPSG Geodetic Parameter Dataset has been loaded into
postgres from EPSG version 7.6.
When I try to transform a geometry from EPSG:4326 (2D CRS) to
EPSG:4979
(3D CRS) I get the following:
Caused by:
org.opengis.referencing.operation.OperationNotFoundException:
No transformation available from system "EllipsoidalCS[Ellipsoidal 2D
CS. Axes: latitude, longitude. Orientations: north, east. UoM:
degree]"
to "EllipsoidalCS[Ellipsoidal 3D CS. Axes: latitude, longitude,
ellipsoidal height. Orientations: north, east, up. UoM: degree,
degree,
metre.]".
at
org.geotools.referencing.operation.AbstractCoordinateOperationFactory.swapAndScaleAxis(AbstractCoordinateOperationFactory.java:278)
at
org.geotools.referencing.operation.DefaultCoordinateOperationFactory.swapAndScaleAxis(DefaultCoordinateOperationFactory.java:591)
at
org.geotools.referencing.operation.DefaultCoordinateOperationFactory.createOperationStep(DefaultCoordinateOperationFactory.java:780)
at
org.geotools.referencing.operation.DefaultCoordinateOperationFactory.createOperation(DefaultCoordinateOperationFactory.java:239)
at
org.geotools.referencing.operation.BufferedCoordinateOperationFactory.createOperation(BufferedCoordinateOperationFactory.java:254)
at
org.geotools.referencing.CRS.findMathTransform(CRS.java:1097)
... 50 more
Caused by: java.lang.IllegalArgumentException: No source axis
match UP.
at
org.geotools.referencing.operation.matrix.GeneralMatrix.<init>(GeneralMatrix.java:314)
at
org.geotools.referencing.operation.matrix.GeneralMatrix.<init>(GeneralMatrix.java:221)
at
org.geotools.referencing.cs.AbstractCS.swapAndScaleAxis(AbstractCS.java:331)
at
org.geotools.referencing.operation.AbstractCoordinateOperationFactory.swapAndScaleAxis(AbstractCoordinateOperationFactory.java:276)
It seems to me that 2D to 3D transform should be simple (just add a 0
value for Z axis). Is there a way to do this? If not, shall I file an
RFE? Thanks for your help.
--
Regards,
Farrukh Najmi
Web: http://www.wellfleetsoftware.com
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