Hello Davis
In the WarpTransform2D constructor, the integer argument (which is 0 in the
posted code) should be some positive value, typically between 1 and 7. The value
depends on the degree of the WarpTransform2D you want. The degree you can afford
depends on the amount of points you have.
I would suggest a degree 2, which requires at least 6 points (actually I noticed
that WarpTransform doesn't work well when you have the minimal amount of points,
so I would suggest at least 10 points).
The remainder seems okay. Just to be sure, the ReferencedEnvelope should be in
the same units than the source points. So if you source points are pixel
coordinates, then the ReferencedEnvelope should be pixel coordinates also. I
think it is already the case in your code; just wanted to be sure.
Later one, you invoke coverage.getRenderableImage(0,0). It should rather be
getRenderableImage(0,1). An alternative is to cast to GridCoverage2D:
RenderedImage image = ((GridCoverage2D) coverage).getRenderedImage();
Martin
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