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: 1
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: 1
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