On Fri, Jun 20, 2008 at 12:51 AM, Dan D'Alimonte <[EMAIL PROTECTED]> wrote:
> I cannot seem to get a WritableRaster (or
> some other manner of modifying the cells of the raster in the grid) back
> out of a GridCoverage2D once I have created the spatially referenced grid.
Dan,
Do you mean you want to modify the values in an existing coverage ?
That's quite possible, but for map algebra I generally have one or
more coverages as inputs to some operation, the result of which is a
new output coverage.
To get at the raster data GridCoverage2D.getRenderedImage is your friend.
Also, have a look at the geotools helper class ImageWorker.
Here's an example (note: there are probably much more elegant ways of
doing this :)
// binary thresholding: output pixels are 1 where input pixels
>= min value; 0 otherwise
RenderedImage image = mycoverage.getRenderedImage();
ImageWorker iworker = new ImageWorker(image);
iworker.binarize(minValue);
// create output coverage
RenderedImage outImage = iworker.getRenderedImage();
Envelope2D envelope = mycoverage.getGridGeometry().getEnvelope2D();
GridCoverageFactory factory =
CoverageFactoryFinder.getGridCoverageFactory(null);
GridCoverage2D result = factory.create("result", outImage, envelope);
Michael
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