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RUSLE calculation: LS factor data loss

Question asked by cernilite on Jun 1, 2012
Latest reply on Jul 12, 2012 by junkmail2
I am using Arc Hyrdo for the first time in order to create a map using the Revised Universal Soil Loss Equation. I am using hydro to create a flow accumulation raster which I will later use in the raster calculator with a slope layer to determine an LS factor for the area I'm working on. I am following the following sources in doing so:

http://bss.sfsu.edu/jdavis/geog621/projects%20and%20data/Smulyan_Final%20Paper.pdf
http://www.utexas.edu/depts/grg/hudson/grg360g/EGIS/labs_04/Lab9/lab9_soil_erosion_05.htm
http://www.utexas.edu/depts/grg/hudson/grg360g/EGIS/labs_04/Lab6/lab6_spring05.htm

My accumulation raster appears to be correct according to the pictures they have in one of the sources. I believe my slope calc is also right but im not as sure. When i follow the calculation shown in both the sfsu and utexas sources (1.6 * Pow(([flowacc] * resolution) / 22.1, 0.6) * Pow(Sin([tempoal_slope] * 0.01745) / 0.09, 1.3)) my LS calc becomes very pixelated and there are many pixels with "no data," despite the fact that there is no missing data in the slope or accum rasters.

Has anybody encountered this problem before or have any advice from a similar problem with the raster calculator in the past? Any help would be awesome!

Kyle

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