r.cost
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.
Raster (r.*)
ParameterRaster|input|Name of raster map containing grid cell cost information|False
ParameterVector|start_points|Name of starting vector points map|0|False
ParameterVector|stop_points|Name of stop vector points map|0|False
ParameterBoolean|-k|Use the 'Knight's move'; slower, but more accurate|False
ParameterBoolean|-n|Keep null values in output raster map|False
OutputRaster|output|Name for output raster map
