Tool Terrain Surface Classification (Iwahashi and Pike)
Terrain surface classification as proposed by Iwahashi & Pike (2007).
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.
- Author: O.Conrad (c) 2012
- Menu: Terrain Analysis|Terrain Classification
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Elevation | Grid, input | DEM | - | - |
| Slope (*) | Grid, input, optional | SLOPE | - | - |
| Convexity (*) | Grid, input, optional | CONVEXITY | - | - |
| Texture (*) | Grid, input, optional | TEXTURE | - | - |
| Output | Landforms | Grid, output | LANDFORMS | - | - |
| Options | Grid System | Grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Recalculate | Boolean | CONV_RECALC | - | Default: 0 |
| Recalculate | Boolean | TEXT_RECALC | - | Default: 0 |
| Number of Classes | Choice | TYPE | - | Available Choices:
[0] 8
[1] 12
[2] 16
Default: 2 |
| Scale (Cells) | Integer | CONV_SCALE | - | Minimum: 1
Default: 10 |
| Laplacian Filter Kernel | Choice | CONV_KERNEL | - | Available Choices:
[0] four-neighbourhood
[1] eight-neihbourhood
[2] eight-neihbourhood (distance based weighting)
Default: 0 |
| Type | Choice | CONV_TYPE | - | Available Choices:
[0] convexity
[1] concavity
Default: 0 |
| Flat Area Threshold | Floating point | CONV_EPSILON | - | Minimum: 0.000000
Default: 0.000000 |
| Scale (Cells) | Integer | TEXT_SCALE | - | Minimum: 10
Default: 2 |
| Flat Area Threshold | Floating point | TEXT_EPSILON | maximum difference between original and median filtered elevation (3x3 moving window) that still is recognized flat | Minimum: 0.000000
Default: 1.000000 |
| (*) optional |
Command-line
Usage: saga_cmd ta_morphometry 22 [-DEM <str>] [-SLOPE <str>] [-CONVEXITY <str>] [-CONV_RECALC <str>] [-TEXTURE <str>] [-TEXT_RECALC <str>] [-LANDFORMS <str>] [-TYPE <str>] [-CONV_SCALE <num>] [-CONV_KERNEL <str>] [-CONV_TYPE <str>] [-CONV_EPSILON <double>] [-TEXT_SCALE <num>] [-TEXT_EPSILON <double>]
-DEM:<str> Elevation
Grid, input
-SLOPE:<str> Slope
Grid, input, optional
-CONVEXITY:<str> Convexity
Grid, input, optional
-CONV_RECALC:<str> Recalculate
Boolean
Default: 0
-TEXTURE:<str> Texture
Grid, input, optional
-TEXT_RECALC:<str> Recalculate
Boolean
Default: 0
-LANDFORMS:<str> Landforms
Grid, output
-TYPE:<str> Number of Classes
Choice
Available Choices:
[0] 8
[1] 12
[2] 16
Default: 2
-CONV_SCALE:<num> Scale (Cells)
Integer
Minimum: 1
Default: 10
-CONV_KERNEL:<str> Laplacian Filter Kernel
Choice
Available Choices:
[0] four-neighbourhood
[1] eight-neihbourhood
[2] eight-neihbourhood (distance based weighting)
Default: 0
-CONV_TYPE:<str> Type
Choice
Available Choices:
[0] convexity
[1] concavity
Default: 0
-CONV_EPSILON:<double> Flat Area Threshold
Floating point
Minimum: 0.000000
Default: 0.000000
-TEXT_SCALE:<num> Scale (Cells)
Integer
Minimum: 10
Default: 2
-TEXT_EPSILON:<double> Flat Area Threshold
Floating point
Minimum: 0.000000
Default: 1.000000