Vertical Distance to Channel Network
- Author: O.Conrad (c) 2002
- Menu: Terrain Analysis | Channels
Description
This tool 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
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, output, optional | BASELEVEL | This optional grid output contains the interpolated channel network base level elevations. | - | |
| Options | Grid System | grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Tension Threshold | floating point number | THRESHOLD | Maximum change in elevation units (e.g. meter), iteration is stopped once maximum change reaches this threshold. | Minimum: 0.000000 Default: 1.000000 | |
| Maximum Iterations | integer number | MAXITER | Maximum number of iterations, ignored if set to zero | Minimum: 0 Default: 0 | |
| Keep Base Level below Surface | boolean | NOUNDERGROUND | - | Default: 1 |
Command Line
Usage: saga_cmd ta_channels 3 [-ELEVATION] [-CHANNELS ] [-DISTANCE ] [-BASELEVEL ] [-THRESHOLD ] [-MAXITER ] [-NOUNDERGROUND ] -ELEVATION: Elevation grid, input -CHANNELS: Channel Network grid, input -DISTANCE: Vertical Distance to Channel Network grid, output -BASELEVEL: Channel Network Base Level grid, output, optional -THRESHOLD: Tension Threshold floating point number Minimum: 0.000000 Default: 1.000000 -MAXITER: Maximum Iterations integer number Minimum: 0 Default: 0 -NOUNDERGROUND: Keep Base Level below Surface boolean Default: 1