Tool Name	LS Factor (One Step)
Tool ID	ls_factor
Library ID	ta_hydrology
Version	1.0
Author(s)	O.Conrad (c) 2019

Description

This is a simple to use one step tool to derive the LS Factor of the Universal Soil Loss Equation (USLE) from a Digital Elevatin Model (DEM). It combines DEM preprocessing (sink removal), flow accumulation and specific catchment area (SCA) derivation, slope and final LS factor calculation exposing only the most important options.

References

Desmet & Govers (1996): A GIS Procedure for Automatically Calculating the USLE LS Factor on Topographically Complex Landscape Units. Journal of Soil and Water Conservation, 51(5):427.433.

Moore, I.D., Grayson, R.B., Ladson, A.R. (1991): Digital terrain modelling: a review of hydrogical, geomorphological, and biological applications. Hydrological Processes, Vol.5, No.1.

Parameters

Name	Type	Identifier	Description	Constraints
Input
DEM	grid, input	DEM
Output
LS Factor	grid, output	LS_FACTOR
Options
Feet Conversion	boolean	FEET	Needed if area and lengths come from coordinates measured in feet.	Default: 0
Method	choice	LS_METHOD		Available Choices: [0] Moore et al. 1991 [1] Desmond & Govers 1996 Default: 0
Preprocessing	choice	PREPROCESSING		Available Choices: [0] none [1] Fill Sinks (Wang & Liu) [2] Sink Removal Default: 0
Minimum Slope	floating point number	MINSLOPE	Minimum slope (degree) for filled areas.	Minimum: 0.000000 Default: 0.000100