Re: [Geotools-gt2-users] userdefined CoordinateReferenceSystem

[Paulm <pau...@sa...>]

Paulm wrote:
> 
> Hi!
> I´ve tried Abels example code for creating CRS, but this row:
> MathTransformFactory mtFactory =
> FactoryFinder.getMathTransformFactory(null) 
> 
> flags error: "The method getMathTransformFactory(null) is undefined for
> the type FactoryFinder"
> Have I missed something?
> 
> I´m using GeoTools 2.5.1
> and I´ve imported the following packages:
> import org.geotools.factory.FactoryFinder;
> import org.geotools.referencing.factory.ReferencingFactoryContainer;
> import org.opengis.parameter.ParameterValueGroup;
> import org.opengis.referencing.crs.CoordinateReferenceSystem;
> import org.opengis.referencing.crs.GeographicCRS;
> import org.opengis.referencing.crs.ProjectedCRS;
> import org.opengis.referencing.cs.CartesianCS;
> import org.opengis.referencing.operation.MathTransformFactory;
> 
> 
> /Paul
> 
> -----Original Message-----
> From: Martin Desruisseaux [mailto:mar...@ge...] 
> Sent: den 18 december 2008 15:14
> To: Malm Paul
> Cc: geo...@li...
> Subject: Re: [Geotools-gt2-users] userdefined CoordinateReferenceSystem
> 
> Malm Paul a écrit :
>> Is there any example how to create a userdefined 
>> CoordinateReferenceSystem with elippsoid and projection parameters as
>> input?
> 
> First, you need to create a GeographicCRS from your Ellipsoid. You can use
> org.opengis.referencing.crs.CRSFactory for this purpose (this approach is
> implementation-independant), or instantiate DefaultGeographicCRS directly
> (easier, but specific to GeoTools implementation).
> 
> Next, you need to create a MathTransform from your parameters. Use
> MathTransformFactory for that. First invoke getDefaultParameter with the
> projection name in arguments, then set your parameter values using
> group.parameter("a parameter name").setValue(aValue). Finally pass the
> parameters to MathTransformFactory.createParameterizedTransform.
> 
> Finally, you can create a ProjectedCRS from the two above piece. Again you
> can use the CRSFactory (implementation-independant) or instantiate
> DefaultProjectedCRS directly (slightly easier - it has a convenience
> method expecting directly a MathTransform).
> 
> 	Martin
> 
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