SAGA-GIS Module Library Documentation (v2.1.3)

Module Terrain Ruggedness Index (TRI)


References:

Riley, S.J., De Gloria, S.D., Elliot, R. (1999): A Terrain Ruggedness that Quantifies Topographic Heterogeneity. Intermountain Journal of Science, Vol.5, No.1-4, pp.23-27. online.

Parameters

 NameTypeIdentifierDescriptionConstraints
InputElevationGrid (input)DEM--
OutputTerrain Ruggedness Index (TRI)Grid (output)TRI--
OptionsRadius (Cells)IntegerRADIUS-Minimum: 1
Default: 1
WeightingParametersWEIGHTING-4 Parameters:
- 1. Available Choices:
[0] no distance weighting
[1] inverse distance to a power
[2] exponential
[3] gaussian weighting
Default: 0
- 2. Minimum: 0.000000
Default: 1.000000
- 3. Default: 1
- 4. Minimum: 0.000000
Default: 1.000000

Command-line

Usage: saga_cmd ta_morphometry 16 -DEM <str> [-TRI <str>] [-RADIUS <num>] [-DISTANCE_WEIGHTING_DW_WEIGHTING <str>] [-DISTANCE_WEIGHTING_DW_IDW_POWER <str>] [-DISTANCE_WEIGHTING_DW_IDW_OFFSET <str>] [-DISTANCE_WEIGHTING_DW_BANDWIDTH <str>]
  -DEM:<str>                             	Elevation
	Grid (input)
  -TRI:<str>                             	Terrain Ruggedness Index (TRI)
	Grid (output)
  -RADIUS:<num>                          	Radius (Cells)
	Integer
	Minimum: 1
	Default: 1
  -DISTANCE_WEIGHTING_DW_WEIGHTING:<str> 	Weighting Function
	Choice
	Available Choices:
	[0] no distance weighting
	[1] inverse distance to a power
	[2] exponential
	[3] gaussian weighting
	Default: 0
  -DISTANCE_WEIGHTING_DW_IDW_POWER:<str> 	Inverse Distance Weighting Power
	Floating point
	Minimum: 0.000000
	Default: 1.000000
  -DISTANCE_WEIGHTING_DW_IDW_OFFSET:<str>	Inverse Distance Offset
	Boolean
	Default: 1
  -DISTANCE_WEIGHTING_DW_BANDWIDTH:<str> 	Gaussian and Exponential Weighting Bandwidth
	Floating point
	Minimum: 0.000000
	Default: 1.000000