Re: [Geotools-gt2-users] grid coverage cell size

[Martin D. <mar...@ge...>]

Michael Bedward a écrit :
> How do I query a GridCoverage2D object to determine the width of its
> cells in map units ?

There is no method doing explicitly that. However you can query

MathTransform2D gridToCRS = GridCoverage2D.getGridGeometry().getGridToCRS2D();

cast "gridToCRS" to java.awt.geom.AffineTransform (to be strict, you should 
check if it is really an instance of AffineTransform - it will be in most cases, 
but doesn't have to be in all cases). Once you have your "gridToCRS", you can 
query getScaleX() and getScaleY(). If there is no rotation, they will match the 
pixel width and height respectively.

To be slightly more generic, you may invoke 
org.geotools.referencing.operation.matrix.XAffineTransform.getScaleX0(gridToCRS) 
and XAffineTransform.getScaleY0(gridToCRS) instead. They will work even if there 
is a rotation.

	Martin