Breach Depressions
| Author(s) | O.Conrad (c) 2020 |
| Library ID | ta_preprocessor |
| Tool ID | 7 |
| Version | 1.0 |
| 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
WhiteBox GAT
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