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. 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.
- 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, 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 | 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, output, optional
-TERRAIN:<str> Terrain View Factor
Grid, output, optional
-DISTANCE:<str> Average View Distance
Grid, output, optional
-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