Tool Sky View Factor

Calculation of visible sky, sky view factor (SVF) and related parameters.

References

Boehner, J., Antonic, O. (2009): Land-surface parameters specific to topo-climatology. In: Hengl, T., Reuter, H. (Eds.): Geomorphometry - Concepts, Software, Applications. Developments in Soil Science, Volume 33, p.195-226, Elsevier.
Hantzschel, J., Goldberg, V., Bernhofer, C. (2005): GIS-based regionalisation of radiation, temperature and coupling measures in complex terrain for low mountain ranges. Meteorological Applications, V.12:01, p.33-42, doi:10.1017/S1350482705001489.
Oke, T.R. (2000): Boundary Layer Climates. Taylor & Francis, New York. 435pp.

Author: O.Conrad (c) 2008
Menu: Terrain Analysis|Lighting

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Elevation	Grid (input)	`DEM`	-	-
Output	Visible Sky	Grid (output)	`VISIBLE`	The unobstructed hemisphere given as percentage.	-
	Sky View Factor	Grid (output)	`SVF`	-	-
	Sky View Factor (Simplified) (*)	Grid (optional output)	`SIMPLE`	-	-
	Terrain View Factor (*)	Grid (optional output)	`TERRAIN`	-	-
	Average View Distance (*)	Grid (optional output)	`DISTANCE`	Average distance to horizon.	-
Options	Grid System	Grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Maximum Search Radius	Floating point	`RADIUS`	The maximum search radius [map units]. This value is ignored if set to zero.	Minimum: 0.000000 Default: 10000.000000
	Number of Sectors	Integer	`NDIRS`	-	Minimum: 3 Default: 8
	Method	Choice	`METHOD`	-	Available Choices: [0] cell size [1] multi scale Default: 0
	Multi Scale Factor	Floating point	`DLEVEL`	-	Minimum: 1.250000 Default: 3.000000
(*) optional

Command-line

Usage: saga_cmd ta_lighting 3 [-DEM <str>] [-VISIBLE <str>] [-SVF <str>] [-SIMPLE <str>] [-TERRAIN <str>] [-DISTANCE <str>] [-RADIUS <double>] [-NDIRS <num>] [-METHOD <str>] [-DLEVEL <double>]
  -DEM:<str>      	Elevation
	Grid (input)
  -VISIBLE:<str>  	Visible Sky
	Grid (output)
  -SVF:<str>      	Sky View Factor
	Grid (output)
  -SIMPLE:<str>   	Sky View Factor (Simplified)
	Grid (optional output)
  -TERRAIN:<str>  	Terrain View Factor
	Grid (optional output)
  -DISTANCE:<str> 	Average View Distance
	Grid (optional output)
  -RADIUS:<double>	Maximum Search Radius
	Floating point
	Minimum: 0.000000
	Default: 10000.000000
  -NDIRS:<num>    	Number of Sectors
	Integer
	Minimum: 3
	Default: 8
  -METHOD:<str>   	Method
	Choice
	Available Choices:
	[0] cell size
	[1] multi scale
	Default: 0
  -DLEVEL:<double>	Multi Scale Factor
	Floating point
	Minimum: 1.250000
	Default: 3.000000