Cumulative area distribution

Discussion created by philipwarner on Apr 17, 2013
Latest reply on Apr 19, 2013 by philipwarner

I'm carrying out a geomorphological analysis in a mountain area and have calculated some parameters I'd like to analyse. From a DEM I have calculated the drainage areas contributing to each cell of the DEM and also the local (cell) slope. It is well known that there is a relationship between these two variables, and would like to figure out the shape of this relationship for my study area. My final goal is to identify changes in the relationship which would indicate the shift from one type of predominant erosion phenomenon to another (for instance diffuse erosion to channeled erosion). This is a fairly consolidated methodology. However, I'm struggling with creating the graph that would allow the investigation of this relationship in ArcGIS.

In short: I'd like to build a graph showing the cumulative area distribution graph against the drainage area. The graph is computed by arranging all drainage areas say in a basin or catchment in numerical order and computing the probability of exceedence for any given area value.

Any idea on how to do this? Any help is appreciated.