Module Vertical Distance to Channel Network
This module calculates the 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) 2002
- Specification: grid
- Menu: Terrain Analysis|Channels
Parameters
| Name | Type | Identifier | Description | Constraints | |
|---|---|---|---|---|---|
| Input | Elevation | Grid (input) | ELEVATION | A grid that contains elevation data. | - |
| Channel Network | Grid (input) | CHANNELS | A grid providing information about the channel network. It is assumed that no-data cells are not part of the channel network. Vice versa all others cells are recognised as channel network members. | - | |
| Output | Vertical Distance to Channel Network | Grid (output) | DISTANCE | The resulting grid gives the altitude above the channel network in the same units as the elevation data. | - |
| Channel Network Base Level (*) | Grid (optional output) | BASELEVEL | This optional grid output contains the interpolated channel network base level elevations. | - | |
| Options | Tension Threshold [Percentage of Cell Size] | Floating point | THRESHOLD | - | Minimum: 0.000000 Default: 1.000000 |
| Keep Base Level below Surface | Boolean | NOUNDERGROUND | - | Default: 1 | |
| (*) optional | |||||
Command-line
Usage: saga_cmd ta_channels 3 [-ELEVATION <str>] [-CHANNELS <str>] [-DISTANCE <str>] [-BASELEVEL <str>] [-THRESHOLD <str>] [-NOUNDERGROUND <str>] -ELEVATION:<str> Elevation Grid (input) -CHANNELS:<str> Channel Network Grid (input) -DISTANCE:<str> Vertical Distance to Channel Network Grid (output) -BASELEVEL:<str> Channel Network Base Level Grid (optional output) -THRESHOLD:<str> Tension Threshold [Percentage of Cell Size] Floating point Minimum: 0.000000 Default: 1.000000 -NOUNDERGROUND:<str> Keep Base Level below Surface Boolean Default: 1