Flow Accumulation (Parallelizable)
- Author: O.Conrad (c) 2018
- Menu: Terrain Analysis | Hydrology | Flow Accumulation | Alternatives
Description
A simple implementation of a parallelizable flow accumulation algorithn.
References
- Freeman, G.T. (1991): Calculating catchment area with divergent flow based on a regular grid. Computers and Geosciences, 17:413-22. doi:10.1016/0098-3004(91)90048-I.
- O'Callaghan, J.F. & Mark, D.M. (1984): The extraction of drainage networks from digital elevation data. Computer Vision, Graphics and Image Processing, 28:323-344. doi:10.1016/S0734-189X(84)80011-0.
- Tarboton, D.G. (1997): A new method for the determination of flow directions and upslope areas in grid digital elevation models. Water Resources Research, Vol.33, No.2, p.309-319. doi:10.1029/96WR03137.
Parameters
| Name | Type | Identifier | Description | Constraints | |
|---|---|---|---|---|---|
| Input | Elevation | grid, input | DEM | - | - |
| Output | Flow Accumulation | grid, output | FLOW | - | - |
| Options | Grid System | grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Update Frequency | integer number | UPDATE | if zero no updates will be done | Minimum: 0 Default: 0 | |
| Method | choice | METHOD | - | Available Choices: [0] D8 [1] Dinfinity [2] MFD Default: 2 | |
| Convergence | floating point number | CONVERGENCE | - | Minimum: 0.000000 Default: 1.100000 |
Command Line
Usage: saga_cmd ta_hydrology 29 [-DEM] [-FLOW ] [-UPDATE ] [-METHOD ] [-CONVERGENCE ] -DEM: Elevation grid, input -FLOW: Flow Accumulation grid, output -UPDATE: Update Frequency integer number Minimum: 0 Default: 0 -METHOD: Method choice Available Choices: [0] D8 [1] Dinfinity [2] MFD Default: 2 -CONVERGENCE: Convergence floating point number Minimum: 0.000000 Default: 1.100000