I have two locations: (A) starting point and (B) designation. Also I have a slope raster. I want to find the cheapest path between these two locations based on the slope (it is more expensive to travel over steep slope). What tools in which order do I have to use in order to get that (either ArcGIS or Grass GIS)?
There are several relevant commands in GRASS:
- r.drain traces a flow through a least-cost path in an elevation model
- r.cost determines the cumulative cost of moving to each cell on the input cost surface
- r.walk outputs a raster map layer showing the lowest cumulative cost of moving between each cell and the user-specified starting points