I have about 10 points and I want to run a Cost Surface Analysis. What procedure should I follow and what data do I need? I have the DΕM of the region and I use ArcGIS 10.3. I read from online help the Creating a cost surface raster, but I'm not sure what I have to do. The scenario is moving on foot and I need to find out how far you can travel in 5, 10 and 15 minutes. So I need to calculate somehow the distance in relation to time and slope.