Topic: cost surface

       r.cost                                                       Creates  a  raster map showing the cumulative cost of moving
                                                                    between different geographic locations on  an  input  raster
                                                                    map whose cell category values represent cost.

       r.walk                                                       Creates a raster map showing the anisotropic cumulative cost
                                                                    of moving between different geographic locations on an input
                                                                    raster map whose cell category values represent cost.

       See also the corresponding keyword cost surface for additional references.

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