Maximum Flow Path Length
| Author(s) | O.Conrad (c) 2016 |
| Library ID | ta_hydrology |
| Tool ID | 27 |
| Version | 1.0 |
| Menu | Terrain Analysis | Hydrology | Flow Accumulation |
Description
This tool calculates the maximum upstream or downstream distance or weighted distance along the flow path for each cell based on 'Deterministic 8 (D8)' (O'Callaghan and Mark 1984) flow directions.
References
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
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Elevation | grid, input | ELEVATION | - | - |
| Weights | grid, input, optional | WEIGHTS | - | - |
| Sinks | grid, input, optional | SINKS | A grid indicating sink (terminal) cells. Cells with valid values (i.e. not NoData) act as sinks that capture all incoming flow and sediment and do not route anything downslope. | - |
| Output | Flow Path Length | grid, output | DISTANCE | - | - |
| Options | Grid System | grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Direction of Measurement | choice | DIRECTION | - | Available Choices:
[0] downstream
[1] upstream
Default: 0 |
Command Line
Usage: saga_cmd ta_hydrology 27 [-ELEVATION ] [-WEIGHTS ] [-SINKS ] [-DISTANCE ] [-DIRECTION ]
-ELEVATION: Elevation
grid, input
-WEIGHTS: Weights
grid, input, optional
-SINKS: Sinks
grid, input, optional
-DISTANCE: Flow Path Length
grid, output
-DIRECTION: Direction of Measurement
choice
Available Choices:
[0] downstream
[1] upstream
Default: 0