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