Terrain Surface Convexity

Author: O.Conrad (c) 2012
Menu: Terrain Analysis | Morphometry

Description

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

References

Iwahashi, J. & Pike, R.J. (2007): Automated classifications of topography from DEMs by an unsupervised nested-means algorithm and a three-part geometric signature. Geomorphology, Vol. 86, pp. 409___440.

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Elevation	grid, input	`DEM`	-	-
Output	Convexity	grid, output	`CONVEXITY`	-	-
Options	Grid System	grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Laplacian Filter Kernel	choice	`KERNEL`	-	Available Choices: [0] conventional four-neighbourhood [1] conventional eight-neihbourhood [2] eight-neihbourhood (distance based weighting) Default: 0
	Type	choice	`TYPE`	-	Available Choices: [0] convexity [1] concavity Default: 0
	Flat Area Threshold	floating point number	`EPSILON`	-	Minimum: 0.000000 Default: 0.000000
	Scale (Cells)	integer number	`SCALE`	-	Minimum: 1 Default: 10
	Method	choice	`METHOD`	-	Available Choices: [0] counting cells [1] resampling Default: 1
	Weighting Function	choice	`DW_WEIGHTING`	-	Available Choices: [0] no distance weighting [1] inverse distance to a power [2] exponential [3] gaussian Default: 3
	Power	floating point number	`DW_IDW_POWER`	-	Minimum: 0.000000 Default: 2.000000
	Bandwidth	floating point number	`DW_BANDWIDTH`	Bandwidth for exponential and Gaussian weighting	Minimum: 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