SAGA 9.4.2 | Tool Library Documentation

Terrain Surface Convexity


Description

Terrain surface convexity as proposed by Iwahashi & Pike (2007) for subsequent terrain classification.


References


Parameters

 NameTypeIdentifierDescriptionConstraints
InputElevationgrid, inputDEM--
OutputConvexitygrid, outputCONVEXITY--
OptionsGrid Systemgrid systemPARAMETERS_GRID_SYSTEM--
Laplacian Filter KernelchoiceKERNEL-Available Choices: [0] conventional four-neighbourhood [1] conventional eight-neihbourhood [2] eight-neihbourhood (distance based weighting) Default: 0
TypechoiceTYPE-Available Choices: [0] convexity [1] concavity Default: 0
Flat Area Thresholdfloating point numberEPSILON-Minimum: 0.000000 Default: 0.000000
Scale (Cells)integer numberSCALE-Minimum: 1 Default: 10
MethodchoiceMETHOD-Available Choices: [0] counting cells [1] resampling Default: 1
Weighting FunctionchoiceDW_WEIGHTING-Available Choices: [0] no distance weighting [1] inverse distance to a power [2] exponential [3] gaussian Default: 3
Powerfloating point numberDW_IDW_POWER-Minimum: 0.000000 Default: 2.000000
Bandwidthfloating point numberDW_BANDWIDTHBandwidth for exponential and Gaussian weightingMinimum: 0.000000 Default: 0.700000

Command Line


Usage: saga_cmd ta_morphometry 21 [-DEM ] [-CONVEXITY ] [-KERNEL ] [-TYPE ] [-EPSILON ] [-SCALE ] [-METHOD ] [-DW_WEIGHTING ] [-DW_IDW_POWER ] [-DW_BANDWIDTH ]
  -DEM:            	Elevation
	grid, input
  -CONVEXITY:      	Convexity
	grid, output
  -KERNEL:         	Laplacian Filter Kernel
	choice
	Available Choices:
	[0] conventional four-neighbourhood
	[1] conventional eight-neihbourhood
	[2] eight-neihbourhood (distance based weighting)
	Default: 0
  -TYPE:           	Type
	choice
	Available Choices:
	[0] convexity
	[1] concavity
	Default: 0
  -EPSILON:     	Flat Area Threshold
	floating point number
	Minimum: 0.000000
	Default: 0.000000
  -SCALE:          	Scale (Cells)
	integer number
	Minimum: 1
	Default: 10
  -METHOD:         	Method
	choice
	Available Choices:
	[0] counting cells
	[1] resampling
	Default: 1
  -DW_WEIGHTING:   	Weighting Function
	choice
	Available Choices:
	[0] no distance weighting
	[1] inverse distance to a power
	[2] exponential
	[3] gaussian
	Default: 3
  -DW_IDW_POWER:	Power
	floating point number
	Minimum: 0.000000
	Default: 2.000000
  -DW_BANDWIDTH:	Bandwidth
	floating point number
	Minimum: 0.000000
	Default: 0.700000