Hello, I'm having trouble with what I think should be a relatively straightforward analysis of 10 meter dem data. If you have a minute, could you offer any suggestions. I am trying to calculate a sort of "exposure" score for every cell in a raster. The basic idea is to compare the value of each raster cell with those nearby(200-400m radius). E1= (# cells in surrounding area with elev.< cell elev.)/(# cells in surrounding area with elev.> cell elev.) E2= (sum[cell elev.-(elev.of surrounding cells<gage elev.)])/(sum[(elev.of surrounding cells>cell elev.)-cell elev.]) For both indices, larger values represent locations with greater exposure and smaller values represent more protected, less exposed locations. For instance, the E1 value for a location on top of a cone would be infinity, while that for the low point of an inverted cone would be 0. I've been able to compute these indices for a small number of point locations using a combination of buffer and zonal tools. Unfortunately, I'm now trying to perform this analysis for every cell in a much larger area(2-3 thousand cells) and my original method is no longer feasible. I would greatly appreciate any suggestion you could offer. Thanks, spencer
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