Tool Breach Depressions
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
- Author: O.Conrad (c) 2020
- Menu: Terrain Analysis|Preprocessing
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 | MAX_LENGTH | [Cells] | Minimum: 1 Default: 50 | |
| Maximum Elevation Decrement | Floating point | MAX_ZDEC | - | Minimum: 0.000000 Default: 0.000000 | |
| Minimum Elevation Drop | Floating point | MIN_ZDROP | - | Minimum: 0.000000 Default: 0.000000 | |
| (*) optional | |||||
Command-line
Usage: saga_cmd ta_preprocessor 7 [-DEM <str>] [-NOSINKS <str>] [-MAX_LENGTH <num>] [-MAX_ZDEC <double>] [-MIN_ZDROP <double>] -DEM:<str> Elevation Grid, input -NOSINKS:<str> Preprocessed Grid, output, optional -MAX_LENGTH:<num> Maximum Breach Channel Length Integer Minimum: 1 Default: 50 -MAX_ZDEC:<double> Maximum Elevation Decrement Floating point Minimum: 0.000000 Default: 0.000000 -MIN_ZDROP:<double> Minimum Elevation Drop Floating point Minimum: 0.000000 Default: 0.000000