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It could be done with r.neighbors in grass : Sum number of cells using a 3x3 Count number of cells without Nan/Null value using a 3x3 Divide first generated raster by second one Example : Set a random region 3x3 cells g.region rows=3 cols=3 Initialize with random cell raster r.random.cells output=random_cells distance=0 ncells=5 Sum cells (3x3 is ...

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