SAGA-GIS Tool Library Documentation (v9.1.2)

Tool LS Factor

Calculation of slope length (LS) factor as used by the Universal Soil Loss Equation (USLE), based on slope and specific catchment area (SCA, as substitute for slope length).


References


Parameters

 NameTypeIdentifierDescriptionConstraints
InputSlopeGrid, inputSLOPE--
Catchment AreaGrid, inputAREA--
OutputLS FactorGrid, outputLS--
OptionsGrid SystemGrid systemPARAMETERS_GRID_SYSTEM--
Area to Length ConversionChoiceCONVDerivation of slope lengths from catchment areas. These are rough approximations! Applies not to Desmet & Govers' method.Available Choices:
[0] no conversion (areas already given as specific catchment area)
[1] 1 / cell size (specific catchment area)
[2] square root (catchment length)
Default: 0
Feet AdjustmentBooleanFEETNeeded if area and lengths come from coordinates measured in feet.Default: 0
Method (LS)ChoiceMETHOD-Available Choices:
[0] Moore et al. 1991
[1] Desmet & Govers 1996
[2] Boehner & Selige 2006
Default: 0
Rill/Interrill ErosivityFloating pointEROSIVITY-Minimum: 0.000000
Default: 1.000000
StabilityChoiceSTABILITY-Available Choices:
[0] stable
[1] instable (thawing)
Default: 0

Command-line

Usage: saga_cmd ta_hydrology 22 [-SLOPE <str>] [-AREA <str>] [-LS <str>] [-CONV <str>] [-FEET <str>] [-METHOD <str>] [-EROSIVITY <double>] [-STABILITY <str>]
  -SLOPE:<str>       	Slope
	Grid, input
  -AREA:<str>        	Catchment Area
	Grid, input
  -LS:<str>          	LS Factor
	Grid, output
  -CONV:<str>        	Area to Length Conversion
	Choice
	Available Choices:
	[0] no conversion (areas already given as specific catchment area)
	[1] 1 / cell size (specific catchment area)
	[2] square root (catchment length)
	Default: 0
  -FEET:<str>        	Feet Adjustment
	Boolean
	Default: 0
  -METHOD:<str>      	Method (LS)
	Choice
	Available Choices:
	[0] Moore et al. 1991
	[1] Desmet & Govers 1996
	[2] Boehner & Selige 2006
	Default: 0
  -EROSIVITY:<double>	Rill/Interrill Erosivity
	Floating point
	Minimum: 0.000000
	Default: 1.000000
  -STABILITY:<str>   	Stability
	Choice
	Available Choices:
	[0] stable
	[1] instable (thawing)
	Default: 0