Module Effective Air Flow Heights
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.
- Author: J.Boehner, O.Conrad (c) 2008
- Specification: grid
- Menu: Terrain Analysis|Climate and Weather
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Elevation | Grid (input) | DEM | - | - |
| Wind Direction (*) | Grid (optional input) | DIR | Direction into which the wind blows, starting with 0 for North and increasing clockwise. | - |
| Wind Speed (*) | Grid (optional input) | LEN | - | - |
| Output | Effective Air Flow Heights | Grid (output) | AFH | - | - |
| Options | Wind Direction Units | Choice | DIR_UNITS | - | Available Choices:
[0] radians
[1] degree
Default: 0 |
| Scaling | Floating point | LEN_SCALE | - | Default: 1.000000 |
| Search Distance [km] | Floating point | MAXDIST | - | Minimum: 0.000000
Default: 300.000000 |
| Constant Wind Direction | Floating point | DIR_CONST | constant direction into the wind blows, given as degree | Default: 135.000000 |
| Old Version | Boolean | OLDVER | use old version for constant wind direction (no acceleration and averaging option) | Default: 0 |
| Acceleration | Floating point | ACCEL | - | Minimum: 1.000000
Default: 1.500000 |
| Elevation Averaging | Boolean | PYRAMIDS | use more averaged elevations when looking at increasing distances | Default: 0 |
| Windward Factor | Floating point | LEE | - | Default: 0.500000 |
| Luv Factor | Floating point | LUV | - | Default: 1.000000 |
| (*) optional |
Command-line
Usage: saga_cmd ta_morphometry 11 -DEM <str> [-DIR <str>] [-DIR_UNITS <str>] [-LEN <str>] [-LEN_SCALE <str>] [-AFH <str>] [-MAXDIST <str>] [-DIR_CONST <str>] [-OLDVER <str>] [-ACCEL <str>] [-PYRAMIDS <str>] [-LEE <str>] [-LUV <str>]
-DEM:<str> Elevation
Grid (input)
-DIR:<str> Wind Direction
Grid (optional input)
-DIR_UNITS:<str> Wind Direction Units
Choice
Available Choices:
[0] radians
[1] degree
Default: 0
-LEN:<str> Wind Speed
Grid (optional input)
-LEN_SCALE:<str> Scaling
Floating point
Default: 1.000000
-AFH:<str> Effective Air Flow Heights
Grid (output)
-MAXDIST:<str> Search Distance [km]
Floating point
Minimum: 0.000000
Default: 300.000000
-DIR_CONST:<str> Constant Wind Direction
Floating point
Default: 135.000000
-OLDVER:<str> Old Version
Boolean
Default: 0
-ACCEL:<str> Acceleration
Floating point
Minimum: 1.000000
Default: 1.500000
-PYRAMIDS:<str> Elevation Averaging
Boolean
Default: 0
-LEE:<str> Windward Factor
Floating point
Default: 0.500000
-LUV:<str> Luv Factor
Floating point
Default: 1.000000