I have an elevation raster map, a point, a raster map defining the viewshed from that point, and now I want to produce another raster map with the results of a function of the distance between the point and every point (cell) in the elevation map that has a defined value (not equal to 180) in the viewshed raster map. The function the distance that I want to compute between the point and the cells in the elevation map is the inverse square law. How do I do that?
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