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: 0 Default: 8 | |
Method | Choice | METHOD | - | Available Choices: [0] cell size [1] multi scale Default: 0 | |
Multi Scale Factor | Floating point | DLEVEL | - | Minimum: 0.000000 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: 0 Default: 8 -METHOD:<str> Method Choice Available Choices: [0] cell size [1] multi scale Default: 0 -DLEVEL:<double> Multi Scale Factor Floating point Minimum: 0.000000 Default: 3.000000