Slope, Aspect, Curvature

Author(s)	O.Conrad (c) 2001
Library ID	ta_morphometry
Tool ID	0
Version	1.0
Menu	Terrain Analysis \| Morphometry

Description

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.

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Elevation	grid, input	`ELEVATION`	-	-
Output	Slope	grid, output	`SLOPE`	-	-
	Aspect	grid, output, optional	`ASPECT`	Starting with 0 for the North direction angles are increasing clockwise.	-
	Northness	grid, output, optional	`NORTHNESS`	The aspect's cosine.	-
	Eastness	grid, output, optional	`EASTNESS`	The aspect's sine.	-
	General Curvature	grid, output, optional	`C_GENE`	-	-
	Profile Curvature	grid, output, optional	`C_PROF`	-	-
	Plan Curvature	grid, output, optional	`C_PLAN`	-	-
	Tangential Curvature	grid, output, optional	`C_TANG`	-	-
	Longitudinal Curvature	grid, output, optional	`C_LONG`	Zevenbergen & Thorne (1987) refer to this as profile curvature	-
	Cross-Sectional Curvature	grid, output, optional	`C_CROS`	Zevenbergen & Thorne (1987) refer to this as plan curvature	-
	Minimal Curvature	grid, output, optional	`C_MINI`	-	-
	Maximal Curvature	grid, output, optional	`C_MAXI`	-	-
	Total Curvature	grid, output, optional	`C_TOTA`	-	-
	Flow Line Curvature	grid, output, optional	`C_ROTO`	-	-
Options	Grid System	grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Method	choice	`METHOD`	-	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	choice	`UNIT_SLOPE`	-	Available Choices: [0] radians [1] degree [2] percent rise Default: 0
	Unit	choice	`UNIT_ASPECT`	-	Available Choices: [0] radians [1] degree Default: 0

Command Line


Usage: saga_cmd ta_morphometry 0 [-ELEVATION ] [-SLOPE ] [-ASPECT ] [-NORTHNESS ] [-EASTNESS ] [-C_GENE ] [-C_PROF ] [-C_PLAN ] [-C_TANG ] [-C_LONG ] [-C_CROS ] [-C_MINI ] [-C_MAXI ] [-C_TOTA ] [-C_ROTO ] [-METHOD ] [-UNIT_SLOPE ] [-UNIT_ASPECT ]
  -ELEVATION:     Elevation
	grid, input
  -SLOPE:         Slope
	grid, output
  -ASPECT:        Aspect
	grid, output, optional
  -NORTHNESS:     Northness
	grid, output, optional
  -EASTNESS:      Eastness
	grid, output, optional
  -C_GENE:        General Curvature
	grid, output, optional
  -C_PROF:        Profile Curvature
	grid, output, optional
  -C_PLAN:        Plan Curvature
	grid, output, optional
  -C_TANG:        Tangential Curvature
	grid, output, optional
  -C_LONG:        Longitudinal Curvature
	grid, output, optional
  -C_CROS:        Cross-Sectional Curvature
	grid, output, optional
  -C_MINI:        Minimal Curvature
	grid, output, optional
  -C_MAXI:        Maximal Curvature
	grid, output, optional
  -C_TOTA:        Total Curvature
	grid, output, optional
  -C_ROTO:        Flow Line Curvature
	grid, output, optional
  -METHOD:
                       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:    Unit
	choice
	Available Choices:
	[0] radians
	[1] degree
	[2] percent rise
	Default: 0
  -UNIT_ASPECT:   Unit
	choice
	Available Choices:
	[0] radians
	[1] degree
	Default: 0