SAGA-GIS Tool Library Documentation (v6.3.0)

Tool Terrain Surface Convexity

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


References


Parameters

 NameTypeIdentifierDescriptionConstraints
InputElevationGrid (input)DEM--
OutputConvexityGrid (output)CONVEXITY--
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 pointEPSILON-Minimum: 0.000000
Default: 0.000000
Scale (Cells)IntegerSCALE-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 weighting
Default: 3
Inverse Distance Weighting PowerFloating pointDW_IDW_POWER-Minimum: 0.000000
Default: 1.000000
Inverse Distance OffsetBooleanDW_IDW_OFFSETCalculates weights for distance plus one, avoiding division by zero for zero distancesDefault: 1
Gaussian and Exponential Weighting BandwidthFloating pointDW_BANDWIDTH-Minimum: 0.000000
Default: 0.700000

Command-line

Usage: saga_cmd ta_morphometry 21 [-DEM <str>] [-CONVEXITY <str>] [-KERNEL <str>] [-TYPE <str>] [-EPSILON <double>] [-SCALE <num>] [-METHOD <str>] [-DW_WEIGHTING <str>] [-DW_IDW_POWER <double>] [-DW_IDW_OFFSET <str>] [-DW_BANDWIDTH <double>]
  -DEM:<str>            	Elevation
	Grid (input)
  -CONVEXITY:<str>      	Convexity
	Grid (output)
  -KERNEL:<str>         	Laplacian Filter Kernel
	Choice
	Available Choices:
	[0] conventional four-neighbourhood
	[1] conventional eight-neihbourhood
	[2] eight-neihbourhood (distance based weighting)
	Default: 0
  -TYPE:<str>           	Type
	Choice
	Available Choices:
	[0] convexity
	[1] concavity
	Default: 0
  -EPSILON:<double>     	Flat Area Threshold
	Floating point
	Minimum: 0.000000
	Default: 0.000000
  -SCALE:<num>          	Scale (Cells)
	Integer
	Minimum: 1
	Default: 10
  -METHOD:<str>         	Method
	Choice
	Available Choices:
	[0] counting cells
	[1] resampling
	Default: 1
  -DW_WEIGHTING:<str>   	Weighting Function
	Choice
	Available Choices:
	[0] no distance weighting
	[1] inverse distance to a power
	[2] exponential
	[3] gaussian weighting
	Default: 3
  -DW_IDW_POWER:<double>	Inverse Distance Weighting Power
	Floating point
	Minimum: 0.000000
	Default: 1.000000
  -DW_IDW_OFFSET:<str>  	Inverse Distance Offset
	Boolean
	Default: 1
  -DW_BANDWIDTH:<double>	Gaussian and Exponential Weighting Bandwidth
	Floating point
	Minimum: 0.000000
	Default: 0.700000