SAGA-GIS Module Library Documentation (v2.1.3)

Module 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.

Parameters

 NameTypeIdentifierDescriptionConstraints
InputElevationGrid (input)DEM--
OutputVisible SkyGrid (output)VISIBLEThe unobstructed hemisphere given as percentage.-
Sky View FactorGrid (output)SVF--
Sky View Factor (Simplified) (*)Grid (optional output)SIMPLE--
Terrain View Factor (*)Grid (optional output)TERRAIN--
View Distance (*)Grid (optional output)DISTANCE--
OptionsMaximum Search RadiusFloating pointRADIUSThis value is ignored if set to zero.Minimum: 0.000000
Default: 10000.000000
MethodChoiceMETHOD-Available Choices:
[0] multi scale
[1] sectors
Default: 1
Multi Scale FactorFloating pointDLEVEL-Minimum: 1.250000
Default: 3.000000
Number of SectorsIntegerNDIRS-Minimum: 3
Default: 8
(*) optional

Command-line

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