Module Valley Depth
Valley depth is calculated as difference between the elevation and an interpolated ridge level. Ridge level interpolation uses the algorithm implemented in the 'Vertical Distance to Channel Network' tool. It performs the following steps:
- Definition of ridge cells (using Strahler order on the inverted DEM).
- Interpolation of the ridge level.
- Subtraction of the original elevations from the ridge level.
- Author: O.Conrad (c) 2012
- Menu: Terrain Analysis|Channels
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Elevation | Grid (input) | ELEVATION | - | - |
| Output | Valley Depth | Grid (output) | VALLEY_DEPTH | - | - |
| Ridge Level (*) | Grid (optional output) | RIDGE_LEVEL | - | - |
| Options | Grid system | Grid system | PARAMETERS_GRID_SYSTEM | Grid system | - |
| Tension Threshold [Percentage of Cell Size] | Floating point | THRESHOLD | - | Minimum: 0.000000
Default: 1.000000 |
| Keep Ridge Level above Surface | Boolean | NOUNDERGROUND | - | Default: 1 |
| Ridge Detection Threshold | Integer | ORDER | - | Minimum: 1
Maximum: 7
Default: 4 |
| (*) optional |
Command-line
Usage: saga_cmd ta_channels 7 [-ELEVATION <str>] [-VALLEY_DEPTH <str>] [-RIDGE_LEVEL <str>] [-THRESHOLD <double>] [-NOUNDERGROUND <str>] [-ORDER <num>]
-ELEVATION:<str> Elevation
Grid (input)
-VALLEY_DEPTH:<str> Valley Depth
Grid (output)
-RIDGE_LEVEL:<str> Ridge Level
Grid (optional output)
-THRESHOLD:<double> Tension Threshold [Percentage of Cell Size]
Floating point
Minimum: 0.000000
Default: 1.000000
-NOUNDERGROUND:<str> Keep Ridge Level above Surface
Boolean
Default: 1
-ORDER:<num> Ridge Detection Threshold
Integer
Minimum: 1
Maximum: 7
Default: 4