I have a simple GridGeometry2D in Geotools 13.1 that is created like this:
GridEnvelope grid = new GridEnvelope2D(0, 0, 100, 100);
Envelope2D envelope = new Envelope2D(CRS.decode("EPSG:3857"), 10.0, 10.0,
1.0, 1.0);
GridGeometry2D geom = new GridGeometry2D(grid, envelope);
For a quick test, I'm trying to find the grid coordinates for point (10.0,
10.0):
DirectPosition out = geom.getCRSToGrid2D().transform(
(DirectPosition) new DirectPosition2D(10.0, 10.0),
(DirectPosition) new DirectPosition2D());
I expected the result for the x field to be 0.5 (since the default pixel
anchoring mode is center), but instead this happened:
DirectPosition2D[-0.5000000000001137, 99.5]
I understand that the 99.5 is probably because the GridGeometry2D considers
that y coordinates increase towards the north, but the GridEnvelope2D
ycoordinates apparently increase towards the south (as it is common in
image processing).
What I don't understand is why the x coordinate is negative if the minimal
x for my grid is 0. Why is this happening?
*( Cross-posted
from
http://gis.stackexchange.com/questions/156514/in-geotools-why-does-reprojecting-the-origin-of-a-gridgeometry2d-results-in-off
<http://gis.stackexchange.com/questions/156514/in-geotools-why-does-reprojecting-the-origin-of-a-gridgeometry2d-results-in-off>
)*
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