Tool 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.

Author: O.Conrad (c) 2010
Menu: Terrain Analysis|Morphometry

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Elevation	Grid (input)	`DEM`	-	-
Output	Terrain Ruggedness Index (TRI)	Grid (output)	`TRI`	-	-
Options	Grid system	Grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Search Mode	Choice	`MODE`	-	Available Choices: [0] Square [1] Circle Default: 1
	Search Radius	Integer	`RADIUS`	radius in cells	Minimum: 0 Default: 1
	Weighting Function	Choice	`DW_WEIGHTING`	-	Available Choices: [0] no distance weighting [1] inverse distance to a power [2] exponential [3] gaussian weighting Default: 0
	Inverse Distance Weighting Power	Floating point	`DW_IDW_POWER`	-	Minimum: 0.000000 Default: 1.000000
	Inverse Distance Offset	Boolean	`DW_IDW_OFFSET`	Calculates weights for distance plus one, avoiding division by zero for zero distances	Default: 1
	Gaussian and Exponential Weighting Bandwidth	Floating point	`DW_BANDWIDTH`	-	Minimum: 0.000000 Default: 75.000000

Command-line

Usage: saga_cmd ta_morphometry 16 [-DEM <str>] [-TRI <str>] [-MODE <str>] [-RADIUS <num>] [-DW_WEIGHTING <str>] [-DW_IDW_POWER <double>] [-DW_IDW_OFFSET <str>] [-DW_BANDWIDTH <double>]
  -DEM:<str>            	Elevation
	Grid (input)
  -TRI:<str>            	Terrain Ruggedness Index (TRI)
	Grid (output)
  -MODE:<str>           	Search Mode
	Choice
	Available Choices:
	[0] Square
	[1] Circle
	Default: 1
  -RADIUS:<num>         	Search Radius
	Integer
	Minimum: 0
	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: 0
  -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: 75.000000