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