Someone of you can help me to understand if there are direct commands to find morphologic basin descriptors?

[LucaBucci]

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 , 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 , 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

[DanPatterson_Retired]

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

[LucaBucci]

I think that for the point 4, the right tool is "path Distance" because i have a dem and a stream network and i want for each point of the dem the hydrological distance between every point and the stream network. The hydrological distance isn't straight but depends about the surface. For this reason i used "path distance" Path Distance—Help | ArcGIS for Desktop . I put in source data, the stream network; in cost raster, slope surface ( maybe flowdirection, but the result is not good ); in surface raster, i put the dem.  What do you think about it ?

For the number 5 i have a lots of problems, because i think it's really hard. I try to explain better this point: every cell of the stream network has a elevation value. I want the elevation value difference between each cell of the dem and the corresponding point, hydraulically closest, of the stream network.

I hope i was clear.