Nibble: edges in the result?

Discussion created by fabian.gis on May 7, 2010
Dear Forum

I have tried to nibble away some areas from a grid. Therefore I created a mask-grid with NoData-values for the areas to be recalculated.
However, I´m not satisfied with the result. Depending on the size of the area to be nibbled, there arise edges in the middle of the area. In an number of approximately ten cells width/height no edge is created, only with a larger number.

Is there a way to prevent these edge? I added a picture showing the problem.

Thanks and regards