Tool Isochrones Variable Speed
Calculation of isochrones with variable speed.
In case a cell in an optional input grid is NoData, the corresponding parameter value will be used instead of skipping this cell.
This is the non-interactive tool version, where the target point can be specified either as point shapefile (the first point in the file will be used) or by target coordinates.
References
- Al-Smadi, Mohammad (1998): Incorporating spatial and temporal variation of watershed response in a gis-based hydrologic model. Faculty of the Virginia Polythecnic Insitute and State University. MsC Thesis. online.
- MartÃnez Ãlvarez, V.; Dal-Ré Tenreiro, R.; GarcÃa GarcÃa, A. I.; Ayuga Téllez, F. (): Modelación distribuida de la escorrentÃa superficial en pequeñas cuencas mediante SIG. Evaluación experimental.
- Olaya, V. (2004): Hidrologia computacional y modelos digitales del terreno. Alqua. 536 pp.
- Author: V.Olaya (c) 2004, V.Wichmann (c) 2015
- Menu: Terrain Analysis|Hydrology|Dynamics
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Elevation | grid, input | DEM | - | - |
| Slope | grid, input | SLOPE | - | - |
| Catchment Area | grid, input | FLOWACC | - | - |
| Curve Number (*) | grid, input, optional | CN | - | - |
| Manning's N (*) | grid, input, optional | MANNING | - | - |
| Target Point (*) | shapes, input, optional | TARGET_PT | A point shapefile with the target point. | - |
| Output | Time Out(h) | grid, output | TIME | - | - |
| Speed (m/s) | grid, output | SPEED | - | - |
| Options | Grid System | grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Avg. Manning's N | floating point number | AVGMANNING | - | Default: 0.150000 |
| Avg. Curve Number | floating point number | AVGCN | - | Default: 75.000000 |
| Mixed Flow Threshold (ha) | floating point number | THRSMIXED | - | Default: 18.000000 |
| Channel Definition Threshold (ha) | floating point number | THRSCHANNEL | - | Default: 360.000000 |
| Avg. Rainfall Intensity (mm/h) | floating point number | AVGRAINFALL | - | Default: 1.000000 |
| Channel side slope(m/m) | floating point number | CHANSLOPE | - | Default: 0.500000 |
| Min. Flow Speed (m/s) | floating point number | MINSPEED | - | Default: 0.050000 |
| Target X Coordinate | floating point number | TARGET_PT_X | The x-coordinate of the target point in world coordinates [map units] | Default: 0.000000 |
| Target Y Coordinate | floating point number | TARGET_PT_Y | The y-coordinate of the target point in world coordinates [map units] | Default: 0.000000 |
| (*) optional |
Command-line
Usage: saga_cmd ta_hydrology 30 [-DEM <str>] [-SLOPE <str>] [-FLOWACC <str>] [-CN <str>] [-MANNING <str>] [-TIME <str>] [-SPEED <str>] [-AVGMANNING <double>] [-AVGCN <double>] [-THRSMIXED <double>] [-THRSCHANNEL <double>] [-AVGRAINFALL <double>] [-CHANSLOPE <double>] [-MINSPEED <double>] [-TARGET_PT_X <double>] [-TARGET_PT_Y <double>] [-TARGET_PT <str>]
-DEM:<str> Elevation
grid, input
-SLOPE:<str> Slope
grid, input
-FLOWACC:<str> Catchment Area
grid, input
-CN:<str> Curve Number
grid, input, optional
-MANNING:<str> Manning's N
grid, input, optional
-TIME:<str> Time Out(h)
grid, output
-SPEED:<str> Speed (m/s)
grid, output
-AVGMANNING:<double> Avg. Manning's N
floating point number
Default: 0.150000
-AVGCN:<double> Avg. Curve Number
floating point number
Default: 75.000000
-THRSMIXED:<double> Mixed Flow Threshold (ha)
floating point number
Default: 18.000000
-THRSCHANNEL:<double> Channel Definition Threshold (ha)
floating point number
Default: 360.000000
-AVGRAINFALL:<double> Avg. Rainfall Intensity (mm/h)
floating point number
Default: 1.000000
-CHANSLOPE:<double> Channel side slope(m/m)
floating point number
Default: 0.500000
-MINSPEED:<double> Min. Flow Speed (m/s)
floating point number
Default: 0.050000
-TARGET_PT_X:<double> Target X Coordinate
floating point number
Default: 0.000000
-TARGET_PT_Y:<double> Target Y Coordinate
floating point number
Default: 0.000000
-TARGET_PT:<str> Target Point
shapes, input, optional