LS Factor (One Step)
- Author: O.Conrad (c) 2019
- Menu: Terrain Analysis | Hydrology | Topographic Indices
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 | Grid System | grid system | GRID_SYSTEM | - | - |
| 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 |
Command Line
Usage: saga_cmd ta_hydrology ls_factor [-DEM] [-LS_FACTOR ] [-FEET ] [-LS_METHOD ] [-PREPROCESSING ] [-MINSLOPE ] -DEM: DEM grid, input -LS_FACTOR: LS Factor grid, output -FEET: Feet Conversion boolean Default: 0 -LS_METHOD: Method choice Available Choices: [0] Moore et al. 1991 [1] Desmond & Govers 1996 Default: 0 -PREPROCESSING: Preprocessing choice Available Choices: [0] none [1] Fill Sinks (Wang & Liu) [2] Sink Removal Default: 0 -MINSLOPE: Minimum Slope floating point number Minimum: 0.000000 Default: 0.000100