SAGA-GIS Tool Library Documentation (v7.8.2)

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


Parameters

 NameTypeIdentifierDescriptionConstraints
InputElevationGrid, inputDEM--
SlopeGrid, inputSLOPE--
Catchment AreaGrid, inputFLOWACC--
Curve Number (*)Grid, input, optionalCN--
Manning's N (*)Grid, input, optionalMANNING--
Target Point (*)Shapes, input, optionalTARGET_PTA point shapefile with the target point.-
OutputTime Out(h)Grid, outputTIME--
Speed (m/s)Grid, outputSPEED--
OptionsGrid SystemGrid systemPARAMETERS_GRID_SYSTEM--
Avg. Manning's NFloating pointAVGMANNING-Default: 0.150000
Avg. Curve NumberFloating pointAVGCN-Default: 75.000000
Mixed Flow Threshold (ha)Floating pointTHRSMIXED-Default: 18.000000
Channel Definition Threshold (ha)Floating pointTHRSCHANNEL-Default: 360.000000
Avg. Rainfall Intensity (mm/h)Floating pointAVGRAINFALL-Default: 1.000000
Channel side slope(m/m)Floating pointCHANSLOPE-Default: 0.500000
Min. Flow Speed (m/s)Floating pointMINSPEED-Default: 0.050000
Target X CoordinateFloating pointTARGET_PT_XThe x-coordinate of the target point in world coordinates [map units]Default: 0.000000
Target Y CoordinateFloating pointTARGET_PT_YThe 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