Sky View Factor

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

Description

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. doi:10.1016/S0166-2481(08)00008-1.
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

	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, output, optional	`SIMPLE`	-	-
	Terrain View Factor	grid, output, optional	`TERRAIN`	-	-
	Average View Distance	grid, output, optional	`DISTANCE`	Average distance to horizon.	-
Options	Grid System	grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Maximum Search Radius	floating point number	`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 number	`NDIRS`	-	Minimum: 3 Default: 8
	Method	choice	`METHOD`	-	Available Choices: [0] cell size [1] multi scale Default: 0
	Multi Scale Factor	floating point number	`DLEVEL`	-	Minimum: 1.250000 Default: 3.000000

Command Line


Usage: saga_cmd ta_lighting 3 [-DEM ] [-VISIBLE ] [-SVF ] [-SIMPLE ] [-TERRAIN ] [-DISTANCE ] [-RADIUS ] [-NDIRS ] [-METHOD ] [-DLEVEL ]
  -DEM:         Elevation
	grid, input
  -VISIBLE:     Visible Sky
	grid, output
  -SVF:         Sky View Factor
	grid, output
  -SIMPLE:      Sky View Factor (Simplified)
	grid, output, optional
  -TERRAIN:     Terrain View Factor
	grid, output, optional
  -DISTANCE:    Average View Distance
	grid, output, optional
  -RADIUS:   Maximum Search Radius
	floating point number
	Minimum: 0.000000
	Default: 10000.000000
  -NDIRS:       Number of Sectors
	integer number
	Minimum: 3
	Default: 8
  -METHOD:      Method
	choice
	Available Choices:
	[0] cell size
	[1] multi scale
	Default: 0
  -DLEVEL:   Multi Scale Factor
	floating point number
	Minimum: 1.250000
	Default: 3.000000