Breach Depressions
- Author: O.Conrad (c) 2020
- Menu: Terrain Analysis | Preprocessing
Description
This tool removes all depressions in a DEM by breaching. It can be used to pre-process a digital elevation model (DEM) prior to being used for hydrological analysis. It uses a cost-distance criteria for deciding upon the breach target, i.e. the cell to which the tool will trench a connecting path, and for determining the breach path itself (from the WhiteBox GAT documentation). This is a re-implementation of the 'Breach Depressions' Java code as provided by Dr. John Lindsay's WhiteBox GAT software.
References
Parameters
| Name | Type | Identifier | Description | Constraints | |
|---|---|---|---|---|---|
| Input | Elevation | grid, input | DEM | - | - |
| Output | Preprocessed | grid, output, optional | NOSINKS | - | - |
| Options | Grid System | grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Maximum Breach Channel Length | integer number | MAX_LENGTH | [Cells] | Minimum: 1 Default: 50 | |
| Maximum Elevation Decrement | floating point number | MAX_ZDEC | - | Minimum: 0.000000 Default: 0.000000 | |
| Minimum Elevation Drop | floating point number | MIN_ZDROP | - | Minimum: 0.000000 Default: 0.000000 |
Command Line
Usage: saga_cmd ta_preprocessor 7 [-DEM] [-NOSINKS ] [-MAX_LENGTH ] [-MAX_ZDEC ] [-MIN_ZDROP ] -DEM: Elevation grid, input -NOSINKS: Preprocessed grid, output, optional -MAX_LENGTH: Maximum Breach Channel Length integer number Minimum: 1 Default: 50 -MAX_ZDEC: Maximum Elevation Decrement floating point number Minimum: 0.000000 Default: 0.000000 -MIN_ZDROP: Minimum Elevation Drop floating point number Minimum: 0.000000 Default: 0.000000