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I've found an extract of literature which describes plan very good. The cutoff slope angle is defined as the change in slope angle from one cell to the next along the flowdirection. This value ranges from 0 to 1 for all areas where the slope angle decreases from one cell to the next (if the slope angle increases, there will definitely be no deposition). Therefore, the user input value will range from 0 �?? 1 and be dependent upon the amount of sediment carried by overland flow. For example, an input value of zero will cause the slope length to reset every time there is a decrease in slope angle. An input value of one will cause the slope length to never reset. In an ideal world, this value would be set by an expert familiar with the particular area in question. However, this is not always feasible. The literature(Griffin,et al., 1988; Wilson, 1986) suggests references that a value closer to 0.5 (slopedecreasing by 50% or greater) is appropriate. source: http://onlinegeographer.com/slope/hickey_slope_length.pdf The problem is that there is no tutorial about how the implementation works in ArcGIS 😞 Greetings markus
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03-29-2013
06:09 AM
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Sorry, it seems that you missunderstood my question because of my bad english. I want to do an estimation of erosion and I am using USLE for this. My question is: I want to create NoData if the slope angle between two cells (or areas?) changes more than 30percent. So, if one cell has a slope of 40°..... and the neighbour cell has a slope of 15° --> No Data Is there a possibilitly to do this @msted & curtvprice? Later when I want to calculate the flow_length, I want to this NoData cells to be out. I hope it is now understandable:confused: Thank you again for your help:) Markus
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03-27-2013
03:37 PM
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Hello, I want to to do the following thing: I want to create NoData if the change of the slope angle between cells is >30% But I dont know what I have to do to realize it. What I did is: -Used Fill for the DEM --> Fill_DEM -Used Slope (Percent and Degree) for Fill_DEM --> Slope_Percent & Slope_Degree What should I do next? I really have no idea since i am very new into Arcmap Thank you so much for your help! Mheinz
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03-26-2013
05:27 PM
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