Dear all, esp. Simone and Andrea,

After much dithering I now have the proposed GridCoverage2D coord
conversion methods proposed in this issue...

http://jira.codehaus.org/browse/GEOT-2666

...working correctly. A patch is attached to the issue.

The methods for point conversion reference grid cell centre coords.
The world to grid method treats points lying on any margin of the grid
coverage as included.

The method for converting from grid to world envelope returns the
world coords of the outer cell edges.

The method for converting from world to grid envelope returns coords
of those grid cells whose centres are included in the input world
envelope.

I'm hoping that these conventions (a) make sense and (b) are commonly
useful. Obviously users can still opt for whatever other convention
best suits them by accessing the MathsTransforms directly.

Michael

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