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I am using ArcObjects, namely RasterGeometryProc, to apply rotation on grids. The transformation works fine. However, when looking at the grids properties in ArcGis, the cell sizes has changed.

Without rotation, the cell size is 50 X 50 as expected. After applying rotation transformation (30 degrees), I get 72.728 X 64.539.

Seems like the new size is the extent of the rotated cell ?

Is this a bug, or is it the way it is supposed to be ?

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I found the answer myself, when interpreting this documentation from ESRI.

Seems like the cell width & height is a part of the transformation (affine ?) parameters for e.g. rotation. The cell "size" is not the size of the cell (except when the raster is not rotated), its the increment factor for each cell's spacing in the XY plane.

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