hi, I need to know if there are simple commands for this 5 points: 1. the upslope contributing area, As [m2]; 2. the surface curvature,∇^2H [-], defined as the Laplacian of the elevation; 3. the local slope, S [-], estimated as the maximum slope among the eight possible flow directions that connect the cell under exam to the adjacent cells; 4. the distance from the nearest stream, D [m], defined as the length of the path that hydrologically connects the location under exam to the nearest element of the reference drainage network; 5. the elevation to the nearest stream, H [m], computed as the difference between the elevation of the cell under exam and the elevation of the final point of the aboveidentified path. I think the number 1 is flow accumulation (spatial analyst - hydrology), the number 3 is slope(spatial analyst - surface), the number 2 maybe the command "curvature" from spatial analyst-surface, and for the last two numbers i think the right tools is distance but really i don't know). Thanks so much for your time. Best regards Luca Guglielmo Bucci

yes 1,2,3 are acceptable, but be aware of the curvature calculation Curvature—Help | ArcGIS for Desktop , there are several.

for 4, you could look at Flow Length—Help | ArcGIS for Desktop an as for the last, I think it is just raster intersections but I am not sure