SAGA-GIS Tool Library Documentation (v7.7.0)

Tool Wind Exposition Index

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 pointMAXDIST-Minimum: 0.000000
Default: 300.000000
Angular Step Size (Degree)Floating pointSTEP-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 pointACCEL-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 <str>] [-EXPOSITION <str>] [-MAXDIST <double>] [-STEP <double>] [-OLDVER <str>] [-ACCEL <double>] [-PYRAMIDS <str>]
  -DEM:<str>       	Elevation
	Grid, input
  -EXPOSITION:<str>	Wind Exposition
	Grid, output
  -MAXDIST:<double>	Search Distance [km]
	Floating point
	Minimum: 0.000000
	Default: 300.000000
  -STEP:<double>   	Angular Step Size (Degree)
	Floating point
	Minimum: 1.000000
	Maximum: 45.000000
	Default: 15.000000
  -OLDVER:<str>    	Old Version
	Boolean
	Default: 0
  -ACCEL:<double>  	Acceleration
	Floating point
	Minimum: 1.000000
	Default: 1.500000
  -PYRAMIDS:<str>  	Elevation Averaging
	Boolean
	Default: 0