Sandeep Kumar Jakkaraju a écrit :
> 3). If I can create the images !! Can I get the pixel x,y corresponding
> to some Lat/Lon on the Image Generated ???
I can't said for the two first question. But for this last question, you can.
Given an arbitrary RenderedImage, the easiest approach is to create a
GeneralEnvelope object with the east, west, north and south bounds of yours
image. Then you can create a GridCoverage object:
RenderedImage image = ...
GeneralEnvelope envelope = new GeneralEnvelope(myCRS);
envelope.setRange(0, ...);
envelope.setRange(1, ...);
GridCoverageFactory factory = FactoryFinder.getGridCoverageFactory(null);
GridCoverage2D coverage = factory.create("My coverage", image, envelope);
From that point, you can invoke:
int[] values = null;
Point2D point = ...;
values = coverage.evaluate(point, values);
where 'point' is geographic coordinates.
Note that with more sophesticated grid coverage creation, you can also get
GridCoverage2D to convert automatically for you the pixel value in some
floating
point values. For example if the pixel values are height multiplied by 100 (in
order to fit as an integer type), GridCoverage2D can divide the values by 100
for you.
Martin
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