Slope Over Area Ratio

Summary

Calculates the ratio of the slope to the specific catchment area (contributing area). This is algebraically related to the more common ln(a/tan beta) wetness index, but contributing area is in the denominator to avoid divide by 0 errors when slope is 0.

Usage

Command Prompt Syntax:


					mpiexec -n <number of processes> SlopeAreaRatio
					-slp <slpfile>
					-sca <scafile>
					-sar <sarfile>

Parameters:

slpfile: input slope file
scafile: input specific catchment area file
sarfile: output slope area ratio file

Syntax

SlopeOverAreaRatio (Input_Slope_Grid, Input_Specific_Catchment_Area_Grid, Input_Number_of_Processes, Output_Slope_Divided_By_Area_Ratio_Grid)

Parameter	Explanation	Data Type
Input_Slope_Grid	Dialog Reference A grid of slope. This grid can be generated using either the "D8 Flow Directions" tool or the "D-Infinity Flow Directions" tool. There is no python reference for this parameter.	Raster Layer
Input_Specific_Catchment_Area_Grid	Dialog Reference A grid giving the contributing area value for each cell taken as its own contribution plus the contribution from upslope neighbors that drain in to it. Contributing area is counted in terms of the number of grid cells (or summation of weights). This grid can be generated using either the "D8 Contributing Area" tool or the "D-Infinity Contributing Area" tool. There is no python reference for this parameter.	Raster Layer
Input_Number_of_Processes	Dialog Reference The number of stripes that the domain will be divided into and the number of MPI parallel processes that will be spawned to evaluate each of the stripes. There is no python reference for this parameter.	Long
Output_Slope_Divided_By_Area_Ratio_Grid	Dialog Reference A grid of the ratio of slope to specific catchment area (contributing area). This is algebraically related to the more common ln(a/tan beta) wetness index, but contributing area is in the denominator to avoid divide by 0 errors when slope is 0. There is no python reference for this parameter.	Raster Dataset

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Title Slope Over Area Ratio