Wind Shelter Index

Author: O.Conrad (c) 2019
Menu: Terrain Analysis | Climate and Weather

Description

This tool reimplements the Wind Shelter Index proposed by Plattner et al. (2004), that has originally been implemented within the RSAGA package.

References

Plattner, C., Braun, L.N., Brenning, A. (2004): Spatial variability of snow accumulation on Vernagtferner, Austrian Alps, in winter 2003/2004. Zeitschrift fuer Gletscherkunde und Glazialgeologie, 39: 43-57. PDF at academia.edu.
Winstral, A., Elder, K., Davis, R.E. (2002): Spatial snow modeling of wind-redistributed snow using terrain-based parameters. Journal of Hydrometeorology, 3: 524-538. doi:10.1175/1525-7541(2002)003%3C0524:SSMOWR%3E2.0.CO;2.

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Elevation	grid, input	`ELEVATION`	-	-
Output	Wind Shelter Index	grid, output	`SHELTER`	-	-
Options	Grid System	grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Unit	choice	`UNIT`	-	Available Choices: [0] degree [1] radians Default: 0
	Wind Direction	floating point number	`DIRECTION`	The direction [degree] into which the wind blows.	Default: 135.000000
	Tolerance	floating point number	`TOLERANCE`	The tolerance angle [degree] to the left and right of the direction angle.	Minimum: 0.000000 Maximum: 90.000000 Default: 5.000000
	Distance	floating point number	`DISTANCE`	[cells]	Minimum: 1.000000 Default: 5.000000
	Quantile	floating point number	`QUANTILE`	Set quantile to one to get the maximum slope angle.	Minimum: 0.000000 Maximum: 1.000000 Default: 1.000000
	Include Negative Slopes	boolean	`NEGATIVES`	-	Default: 0
	Method	choice	`METHOD`	-	Available Choices: [0] windward [1] leeward Default: 0

Command Line

Usage: saga_cmd ta_morphometry 29 [-ELEVATION ] [-SHELTER ] [-UNIT ] [-DIRECTION ] [-TOLERANCE ] [-DISTANCE ] [-QUANTILE ] [-NEGATIVES ] [-METHOD ]
  -ELEVATION:   	Elevation
	grid, input
  -SHELTER:     	Wind Shelter Index
	grid, output
  -UNIT:        	Unit
	choice
	Available Choices:
	[0] degree
	[1] radians
	Default: 0
  -DIRECTION:	Wind Direction
	floating point number
	Default: 135.000000
  -TOLERANCE:	Tolerance
	floating point number
	Minimum: 0.000000
	Maximum: 90.000000
	Default: 5.000000
  -DISTANCE: 	Distance
	floating point number
	Minimum: 1.000000
	Default: 5.000000
  -QUANTILE: 	Quantile
	floating point number
	Minimum: 0.000000
	Maximum: 1.000000
	Default: 1.000000
  -NEGATIVES:   	Include Negative Slopes
	boolean
	Default: 0
  -METHOD:      	Method
	choice
	Available Choices:
	[0] windward
	[1] leeward
	Default: 0