[Geotools-devel] [JIRA] (GEOT-5177) Reprojecting the origin of a GridGeometry2D results in off-the-grid coordinates

[Rafael Almeida (JIRA)]

Title: Message Title

Rafael Almeida created an issue   GeoTools / GEOT-5177 Reprojecting the origin of a GridGeometry2D results in off-the-grid coordinates Issue Type: Bug Affects Versions: 13.1 Assignee: Unassigned Components: coverage Created: 31/Jul/15 6:18 PM Environment: Java 1.8, Springs Tool Suite, Debug mode and Run Mode Priority: Medium Reporter: Rafael Almeida ( Cross-posted from gis.stackexchange ) 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 y coordinates 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. Is this a bug or expected behavior? Add Comment   This message was sent by Atlassian JIRA (v6.5-OD-08-001#65007-sha1:1fc9846)

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