Dear all,
I would like to use geotools library for transform among different
coordinate systems and datums. I have read the user-guide, however I still
can't figure out how to use the code to do any transform yet. I appreciate
all helps and guides. Thank you very much in advance.
Here is my first test: Converting from GCS (lat,long,height) to XYZ
coordinates (geocentric or ECEF)
public GCS2ECEF(String latitude, String longitude, String height) {
lat = Double.parseDouble(latitude);
lon = Double.parseDouble(longitude);
this.height = Double.parseDouble(height);
try {
defaultcrs = CRS.decode("EPSG:4957"); //as HARN geographic 3D
targetcrs = CRS.decode("EPSG:4956"); //as HARN geocentric
MathTransform transform = CRS.findMathTransform(defaultcrs,
targetcrs);
source = new DirectPosition3D(defaultcrs,lat,lon,this.height);
result = new DirectPosition3D(targetcrs,lat,lon,this.height);
transform.transform(source, result);
System.out.println("x = " + result.getOrdinate(0));
System.out.println("y = " + result.getOrdinate(1));
System.out.println("z = " + result.getOrdinate(2));
} catch (NoSuchAuthorityCodeException e) {
e.printStackTrace();
}catch (FactoryException e){
e.printStackTrace();
}catch(TransformException e){
e.printStackTrace();
}
}
Error message as below:
Jan 12, 2010 4:22:53 PM org.geotools.factory.FactoryRegistry scanForPlugins
WARNING: Can't load a service for category "MathTransformProvider". Cause is
"NoClassDefFoundError: javax/media/jai/WarpAffine".
org.opengis.referencing.operation.OperationNotFoundException: No
transformation available from system "CartesianCS[Geocentric]" to
"CartesianCS[Earth centred, earth fixed, righthanded 3D coordinate system,
consisting of 3 (...) positive Z-axis parallel to mean earth rotation axis
and pointing towards North Pole. UoM: m.]".
at
org.geotools.referencing.operation.AbstractCoordinateOperationFactory.swapAndScaleAxis(AbstractCoordinateOperationFactory.java:278)
at
org.geotools.referencing.operation.DefaultCoordinateOperationFactory.createOperationStep(DefaultCoordinateOperationFactory.java:1041)
at
org.geotools.referencing.operation.DefaultCoordinateOperationFactory.createOperationStep(DefaultCoordinateOperationFactory.java:1136)
at
org.geotools.referencing.operation.DefaultCoordinateOperationFactory.createOperation(DefaultCoordinateOperationFactory.java:247)
at
org.geotools.referencing.operation.BufferedCoordinateOperationFactory.createOperation(BufferedCoordinateOperationFactory.java:254)
at org.geotools.referencing.CRS.findMathTransform(CRS.java:1026)
at org.geotools.referencing.CRS.findMathTransform(CRS.java:994)
at gov.noaa.vdatum.App.<init>(App.java:34)
at gov.noaa.vdatum.App.main(App.java:23)
Caused by: java.lang.IllegalArgumentException: No source axis match
GEOCENTRIC_X.
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)
... 8 more
I tried to debug the above example and got lost in the jungle of codes.
Where did I go wrong?
I know the geodetic/cartography algorithms to do coordinate transformations,
however I don't know how to use Geotools to do so. Could you please show me
the algorithms or in simple codes of how-to:
1. transform between two different coordinate systems (geographic,
geocentric, UTM) of an input point.
2. transform between two datums, for example from NAD83(HARN) to ITRF2005
Thank you very much once again.
~ble
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