Topic: cost surface

       Note: see also the corresponding keyword cost surface for additional references.

       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.

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