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.
Martínez Álvarez, V.; Dal-Ré Tenreiro, R.; García García, A. I.; Ayuga Téllez, F. (): Modelación distribuida de la escorrentía 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`	-	-
Output	Speed (m/s)	Grid, output	`SPEED`	-	-
Options	Grid System	Grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Avg. Manning's N	Floating point	`AVGMANNING`	-	Default: 0.150000
	Avg. Curve Number	Floating point	`AVGCN`	-	Default: 75.000000
	Mixed Flow Threshold (ha)	Floating point	`THRSMIXED`	-	Default: 18.000000
	Channel Definition Threshold (ha)	Floating point	`THRSCHANNEL`	-	Default: 360.000000
	Avg. Rainfall Intensity (mm/h)	Floating point	`AVGRAINFALL`	-	Default: 1.000000
	Channel side slope(m/m)	Floating point	`CHANSLOPE`	-	Default: 0.500000
	Min. Flow Speed (m/s)	Floating point	`MINSPEED`	-	Default: 0.050000
	Target X Coordinate	Floating point	`TARGET_PT_X`	The x-coordinate of the target point in world coordinates [map units]	Default: 0.000000
	Target Y Coordinate	Floating point	`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
	Default: 0.150000
  -AVGCN:<double>      	Avg. Curve Number
	Floating point
	Default: 75.000000
  -THRSMIXED:<double>  	Mixed Flow Threshold (ha)
	Floating point
	Default: 18.000000
  -THRSCHANNEL:<double>	Channel Definition Threshold (ha)
	Floating point
	Default: 360.000000
  -AVGRAINFALL:<double>	Avg. Rainfall Intensity (mm/h)
	Floating point
	Default: 1.000000
  -CHANSLOPE:<double>  	Channel side slope(m/m)
	Floating point
	Default: 0.500000
  -MINSPEED:<double>   	Min. Flow Speed (m/s)
	Floating point
	Default: 0.050000
  -TARGET_PT_X:<double>	Target X Coordinate
	Floating point
	Default: 0.000000
  -TARGET_PT_Y:<double>	Target Y Coordinate
	Floating point
	Default: 0.000000
  -TARGET_PT:<str>     	Target Point
	Shapes, input, optional