Module Catchment Area (Recursive)
Recursive upward processing of cells for calculation of flow accumulation and related parameters. This set of algorithms processes recursively all upwards connected cells until each cell of the DEM has been processed.
References:
Deterministic 8
- 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
Rho 8:
- Fairfield, J. / Leymarie, P. (1991):
'Drainage networks from grid digital elevation models',
Water Resources Research, 27:709-717
Deterministic Infinity:
- 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
Multiple m_Flow Direction:
- Freeman, G.T. (1991):
'Calculating catchment area with divergent flow based on a regular grid',
Computers and Geosciences, 17:413-22
- Quinn, P.F. / Beven, K.J. / Chevallier, P. / Planchon, O. (1991):
'The prediction of hillslope flow paths for distributed hydrological modelling using digital terrain models',
Hydrological Processes, 5:59-79
- Author: O.Conrad (c) 2001
- Specification: grid
- Menu: Terrain Analysis|Hydrology|Catchment Area
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Elevation | Grid (input) | ELEVATION | - | - |
| Sink Routes (*) | Grid (optional input) | SINKROUTE | - | - |
| Weight (*) | Grid (optional input) | WEIGHT | - | - |
| Input for Mean over Catchment Calculation (*) | Grid (optional input) | VAL_INPUT | - | - |
| Material (*) | Grid (optional input) | MATERIAL | - | - |
| Accumulation Target (*) | Grid (optional input) | TARGET | - | - |
| Target Areas (*) | Grid (optional input) | TARGETS | - | - |
| Output | Catchment Area | Grid (output) | CAREA | - | - |
| Mean over Catchment | Grid (output) | VAL_MEAN | - | - |
| Total accumulated Material (*) | Grid (optional output) | ACCU_TOT | - | - |
| Accumulated Material from Left Side (*) | Grid (optional output) | ACCU_LEFT | - | - |
| Accumulated Material from Right Side (*) | Grid (optional output) | ACCU_RIGHT | - | - |
| m_Flow Path Length (*) | Grid (optional output) | FLOWLEN | - | - |
| Options | Step | Integer | STEP | - | Minimum: 1
Default: 1 |
| Method | Choice | METHOD | - | Available Choices:
[0] Deterministic 8
[1] Rho 8
[2] Deterministic Infinity
[3] Multiple m_Flow Direction
Default: 3 |
| Convergence | Floating point | CONVERGENCE | Convergence factor for Multiple m_Flow Direction Algorithm (Freeman 1991) | Default: 1.100000 |
| (*) optional |
Command-line
Usage: saga_cmd ta_hydrology 1 -ELEVATION <str> [-SINKROUTE <str>] [-WEIGHT <str>] [-CAREA <str>] [-VAL_INPUT <str>] [-VAL_MEAN <str>] [-MATERIAL <str>] [-TARGET <str>] [-ACCU_TOT <str>] [-ACCU_LEFT <str>] [-ACCU_RIGHT <str>] [-STEP <num>] [-TARGETS <str>] [-FLOWLEN <str>] [-METHOD <str>] [-CONVERGENCE <str>]
-ELEVATION:<str> Elevation
Grid (input)
-SINKROUTE:<str> Sink Routes
Grid (optional input)
-WEIGHT:<str> Weight
Grid (optional input)
-CAREA:<str> Catchment Area
Grid (output)
-VAL_INPUT:<str> Input for Mean over Catchment Calculation
Grid (optional input)
-VAL_MEAN:<str> Mean over Catchment
Grid (output)
-MATERIAL:<str> Material
Grid (optional input)
-TARGET:<str> Accumulation Target
Grid (optional input)
-ACCU_TOT:<str> Total accumulated Material
Grid (optional output)
-ACCU_LEFT:<str> Accumulated Material from Left Side
Grid (optional output)
-ACCU_RIGHT:<str> Accumulated Material from Right Side
Grid (optional output)
-STEP:<num> Step
Integer
Minimum: 1
Default: 1
-TARGETS:<str> Target Areas
Grid (optional input)
-FLOWLEN:<str> m_Flow Path Length
Grid (optional output)
-METHOD:<str> Method
Choice
Available Choices:
[0] Deterministic 8
[1] Rho 8
[2] Deterministic Infinity
[3] Multiple m_Flow Direction
Default: 3
-CONVERGENCE:<str> Convergence
Floating point
Default: 1.100000