Wind Exposition Index

Author(s)	J.Böhner, O.Conrad (c) 2015
Library ID	ta_morphometry
Tool ID	27
Version	1.0
Menu	Terrain Analysis \| Climate and Weather

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.

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Elevation	grid, input	`DEM`	-	-
Output	Wind Exposition	grid, output	`EXPOSITION`	-	-
Options	Grid System	grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Search Distance [km]	floating point number	`MAXDIST`	-	Minimum: 0.000000 Default: 300.000000
	Angular Step Size (Degree)	floating point number	`STEP`	-	Minimum: 1.000000 Maximum: 45.000000 Default: 15.000000
	Old Version	boolean	`OLDVER`	use old version for constant wind direction (no acceleration and averaging option)	Default: 0
	Acceleration	floating point number	`ACCEL`	-	Minimum: 1.000000 Default: 1.500000
	Elevation Averaging	boolean	`PYRAMIDS`	use more averaged elevations when looking at increasing distances	Default: 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