Module Valley Depth
Valley depth is calculated here vertical distance to a channel network base level. The algorithm consists of two major steps:
1. Interpolation of a channel network base level elevation
2. Subtraction of this base level from the original elevations
- Author: O.Conrad (c) 2012
- Specification: grid
- 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 | 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 <str>] [-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:<str> 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