Sky View Factor
| Author(s) | O.Conrad (c) 2008 |
| Library ID | ta_lighting |
| Tool ID | 3 |
| Version | 1.0 |
| Menu | Terrain Analysis | Lighting and Visibility |
Description
Calculation of visible sky, sky view factor (SVF) and related parameters.
References
Böhner, 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