Tool Flow Accumulation (Parallelizable)
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. ScienceDirect.
- 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. ScienceDirect.
- 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. Wiley.
- Author: O.Conrad (c) 2018
- Menu: Terrain Analysis|Hydrology|Flow Accumulation|Alternatives
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 | 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 | CONVERGENCE | - | Minimum: 0.000000
Default: 1.100000 |
Command-line
Usage: saga_cmd ta_hydrology 29 [-DEM <str>] [-FLOW <str>] [-UPDATE <num>] [-METHOD <str>] [-CONVERGENCE <double>]
-DEM:<str> Elevation
Grid, input
-FLOW:<str> Flow Accumulation
Grid, output
-UPDATE:<num> Update Frequency
Integer
Minimum: 0
Default: 0
-METHOD:<str> Method
Choice
Available Choices:
[0] D8
[1] Dinfinity
[2] MFD
Default: 2
-CONVERGENCE:<double> Convergence
Floating point
Minimum: 0.000000
Default: 1.100000