SAGA-GIS Tool Library Documentation (v7.8.2)

Tool Slope, Aspect, Curvature

Calculates the local morphometric terrain parameters slope, aspect and if supported by the chosen method also the curvature. Besides tangential curvature also its horizontal and vertical components (i.e. plan and profile curvature) can be calculated.


References


Parameters

 NameTypeIdentifierDescriptionConstraints
InputElevationGrid, inputELEVATION--
OutputSlopeGrid, outputSLOPE--
AspectGrid, outputASPECT--
General Curvature (*)Grid, output, optionalC_GENE--
Profile Curvature (*)Grid, output, optionalC_PROF--
Plan Curvature (*)Grid, output, optionalC_PLAN--
Tangential Curvature (*)Grid, output, optionalC_TANG--
Longitudinal Curvature (*)Grid, output, optionalC_LONGZevenbergen & Thorne (1987) refer to this as profile curvature-
Cross-Sectional Curvature (*)Grid, output, optionalC_CROSZevenbergen & Thorne (1987) refer to this as plan curvature-
Minimal Curvature (*)Grid, output, optionalC_MINI--
Maximal Curvature (*)Grid, output, optionalC_MAXI--
Total Curvature (*)Grid, output, optionalC_TOTA--
Flow Line Curvature (*)Grid, output, optionalC_ROTO--
OptionsGrid SystemGrid systemPARAMETERS_GRID_SYSTEM--
MethodChoiceMETHOD-Available Choices:
[0] maximum slope (Travis et al. 1975)
[1] maximum triangle slope (Tarboton 1997)
[2] least squares fitted plane (Horn 1981, Costa-Cabral & Burgess 1996)
[3] 6 parameter 2nd order polynom (Evans 1979)
[4] 6 parameter 2nd order polynom (Heerdegen & Beran 1982)
[5] 6 parameter 2nd order polynom (Bauer, Rohdenburg, Bork 1985)
[6] 9 parameter 2nd order polynom (Zevenbergen & Thorne 1987)
[7] 10 parameter 3rd order polynom (Haralick 1983)
[8] 10 parameter 3rd order polynom (Florinsky 2009)
Default: 6
UnitChoiceUNIT_SLOPE-Available Choices:
[0] radians
[1] degree
[2] percent rise
Default: 0
UnitChoiceUNIT_ASPECT-Available Choices:
[0] radians
[1] degree
Default: 0
(*) optional

Command-line

Usage: saga_cmd ta_morphometry 0 [-ELEVATION <str>] [-SLOPE <str>] [-ASPECT <str>] [-C_GENE <str>] [-C_PROF <str>] [-C_PLAN <str>] [-C_TANG <str>] [-C_LONG <str>] [-C_CROS <str>] [-C_MINI <str>] [-C_MAXI <str>] [-C_TOTA <str>] [-C_ROTO <str>] [-METHOD <str>] [-UNIT_SLOPE <str>] [-UNIT_ASPECT <str>]
  -ELEVATION:<str>  	Elevation
	Grid, input
  -SLOPE:<str>      	Slope
	Grid, output
  -ASPECT:<str>     	Aspect
	Grid, output
  -C_GENE:<str>     	General Curvature
	Grid, output, optional
  -C_PROF:<str>     	Profile Curvature
	Grid, output, optional
  -C_PLAN:<str>     	Plan Curvature
	Grid, output, optional
  -C_TANG:<str>     	Tangential Curvature
	Grid, output, optional
  -C_LONG:<str>     	Longitudinal Curvature
	Grid, output, optional
  -C_CROS:<str>     	Cross-Sectional Curvature
	Grid, output, optional
  -C_MINI:<str>     	Minimal Curvature
	Grid, output, optional
  -C_MAXI:<str>     	Maximal Curvature
	Grid, output, optional
  -C_TOTA:<str>     	Total Curvature
	Grid, output, optional
  -C_ROTO:<str>     	Flow Line Curvature
	Grid, output, optional
  -METHOD:<str>     	Method
	Choice
	Available Choices:
	[0] maximum slope (Travis et al. 1975)
	[1] maximum triangle slope (Tarboton 1997)
	[2] least squares fitted plane (Horn 1981, Costa-Cabral & Burgess 1996)
	[3] 6 parameter 2nd order polynom (Evans 1979)
	[4] 6 parameter 2nd order polynom (Heerdegen & Beran 1982)
	[5] 6 parameter 2nd order polynom (Bauer, Rohdenburg, Bork 1985)
	[6] 9 parameter 2nd order polynom (Zevenbergen & Thorne 1987)
	[7] 10 parameter 3rd order polynom (Haralick 1983)
	[8] 10 parameter 3rd order polynom (Florinsky 2009)
	Default: 6
  -UNIT_SLOPE:<str> 	Unit
	Choice
	Available Choices:
	[0] radians
	[1] degree
	[2] percent rise
	Default: 0
  -UNIT_ASPECT:<str>	Unit
	Choice
	Available Choices:
	[0] radians
	[1] degree
	Default: 0