gis:set-raster-value

gis:set-raster-value RasterDataset x y value

Sets the value of the given raster dataset at the given cell to a new value. Cell coordinates are numbered from left to right, and from top to bottom, beginning with zero. So the upper left cell is (0, 0), and the bottom right cell is (gis:width-of dataset - 1, gis:height-of dataset - 1).