SAGA 9.4.2 | Tool Library Documentation

Wind Exposition Index


Description

This tool calculates the average 'Wind Effect Index' for all directions using an angular step. Like the 'Wind Effect Index' it is a dimensionless index. Values below 1 indicate wind shadowed areas whereas values above 1 indicate areas exposed to wind.


References


Parameters

 NameTypeIdentifierDescriptionConstraints
InputElevationgrid, inputDEM--
OutputWind Expositiongrid, outputEXPOSITION--
OptionsGrid Systemgrid systemPARAMETERS_GRID_SYSTEM--
Search Distance [km]floating point numberMAXDIST-Minimum: 0.000000 Default: 300.000000
Angular Step Size (Degree)floating point numberSTEP-Minimum: 1.000000 Maximum: 45.000000 Default: 15.000000
Old VersionbooleanOLDVERuse old version for constant wind direction (no acceleration and averaging option)Default: 0
Accelerationfloating point numberACCEL-Minimum: 1.000000 Default: 1.500000
Elevation AveragingbooleanPYRAMIDSuse more averaged elevations when looking at increasing distancesDefault: 0

Command Line


Usage: saga_cmd ta_morphometry 27 [-DEM ] [-EXPOSITION ] [-MAXDIST ] [-STEP ] [-OLDVER ] [-ACCEL ] [-PYRAMIDS ]
  -DEM:       	Elevation
	grid, input
  -EXPOSITION:	Wind Exposition
	grid, output
  -MAXDIST:	Search Distance [km]
	floating point number
	Minimum: 0.000000
	Default: 300.000000
  -STEP:   	Angular Step Size (Degree)
	floating point number
	Minimum: 1.000000
	Maximum: 45.000000
	Default: 15.000000
  -OLDVER:    	Old Version
	boolean
	Default: 0
  -ACCEL:  	Acceleration
	floating point number
	Minimum: 1.000000
	Default: 1.500000
  -PYRAMIDS:  	Elevation Averaging
	boolean
	Default: 0