I made a mistake ... I used AffineTransformBuilder when a
SimilarTransformBuilder works fine...
Sorry for the flutter !
Thomas,
PS : Is there any documentation explaining more in detail than the javadoc
the use of different MathTransforms ?...
2008/5/6 Anaxa Gore <[EMAIL PROTECTED]>:
> Hi,
>
> I want to write some georeferenced informations into a GridCoverage2D. To
> do this, I create a Writable Raster, like this :
>
> final int width = 5000;
> final int height = 5000;
> WritableRaster raster =
> RasterFactory.createBandedRaster(DataBuffer.TYPE_FLOAT,width, height, 1,
> null);
>
> I perform some calculation on my datas and then want to write some points
> into the raster, just created. So I suppose I need a MathTransform, from my
> Envelope2D, describing my geograhic area, to my raster coordinates...?
> I am doing something like this :
>
> DirectPosition2D leftdown = new DirectPosition2D(102.0,23.0);
> DirectPosition2D rightup = new DirectPosition2D(103.0,24.0);
> DirectPosition2D inter = new DirectPosition2D(102.5,23.5);
> Envelope2D env = new Envelope2D(leftdown, rightup);
>
> List<MappedPosition> list = new ArrayList<MappedPosition>(2);
>
> MappedPosition mp1 = new MappedPosition(new DirectPosition2D(0,0),
> leftdown);
> MappedPosition mp2 = new MappedPosition(new
> DirectPosition2D(width,height),rightup);
> MappedPosition mp3 = new MappedPosition(new
> DirectPosition2D(width/2,height/2), inter);
>
> list.add(mp1);
> list.add(mp2);
> list.add(mp3);
>
> AffineTransformBuilder mtb = new AffineTransformBuilder(list);
> MathTransform mt = null;
>
> try {
> mt = mtb.getMathTransform();
> } catch (FactoryException ex) {
> Logger.getLogger(_2_WriteRaster.class.getName()).log(Level.SEVERE,
> null, ex);
> }
>
> But I always get this error, when trying to get the MathTransform :
>
> Exception in thread "main" javax.vecmath.SingularMatrixException: cannot
> invert matrix
> at javax.vecmath.GMatrix.invertGeneral(GMatrix.java:1711)
> at javax.vecmath.GMatrix.invert(GMatrix.java:397)
> at
> org.geotools.referencing.operation.builder.ProjectiveTransformBuilder.calculateLSM(ProjectiveTransformBuilder.java:243)
> at
> org.geotools.referencing.operation.builder.AffineTransformBuilder.getProjectiveMatrix(AffineTransformBuilder.java:99)
> at
> org.geotools.referencing.operation.builder.ProjectiveTransformBuilder.computeMathTransform(ProjectiveTransformBuilder.java:280)
> at
> org.geotools.referencing.operation.builder.MathTransformBuilder.getMathTransform(MathTransformBuilder.java:687)
> at
> org.geotools.referencing.operation.builder.MathTransformBuilder.getErrorStatistics(MathTransformBuilder.java:645)
> at
> org.geotools.referencing.operation.builder.MathTransformBuilder.getTransformation(MathTransformBuilder.java:733)
> at
> geotools_tests.rasters._2_WriteRaster.main(_2_WriteRaster.java:117)
>
> Is there something wrong in my code ?
> Thomas
>
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