Land Surface Temperature (Lapse Rates)
- Author: O.Conrad (c) 2008
- Menu: Terrain Analysis | Climate and Weather
Description
Temperature estimation at each grid point as a function of temperature, temperature lapse rate and elevation for a reference station. Further optional input is the Leaf Area Index (LAI) and the short-wave radiation ratio, which relates the irradiance including terrain effects to that calculated for a flat, horizontal plane. See Wilson & Gallant (2000) for more details.
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.
- Wilson, J. P., Gallant, J. C. (2000): Secondary Topographic Attributes. In: Wilson, J. P., Gallant, J. C. (Eds.): Terrain analysis - Principles and Applications, 87-131.
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Elevation | grid, input | DEM | - | - |
| Short Wave Radiation Ratio | grid, input, optional | SWR | The ratio of daily total short-wave irradiance on sloping sites compared to horizontal sites. | - |
| Leaf Area Index | grid, input, optional | LAI | - | - |
| Output | Land Surface Temperature | grid, output | LST | - | - |
| Options | Grid System | grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Maximum LAI | floating point number | LAI_MAX | - | Minimum: 0.010000
Default: 8.000000 |
| Elevation | floating point number | Z_REFERENCE | - | Default: 0.000000 |
| Temperature | floating point number | T_REFERENCE | Temperature at reference station in degree Celsius. | Default: 0.000000 |
| Temperature Lapse Rate | floating point number | T_GRADIENT | Vertical temperature gradient in degree Celsius per 100 meter. | Default: 0.650000 |
| C Factor | floating point number | C_FACTOR | - | Default: 1.000000 |
Command Line
Usage: saga_cmd ta_morphometry 13 [-DEM ] [-SWR ] [-LAI ] [-LAI_MAX ] [-LST ] [-Z_REFERENCE ] [-T_REFERENCE ] [-T_GRADIENT ] [-C_FACTOR ]
-DEM: Elevation
grid, input
-SWR: Short Wave Radiation Ratio
grid, input, optional
-LAI: Leaf Area Index
grid, input, optional
-LAI_MAX: Maximum LAI
floating point number
Minimum: 0.010000
Default: 8.000000
-LST: Land Surface Temperature
grid, output
-Z_REFERENCE: Elevation
floating point number
Default: 0.000000
-T_REFERENCE: Temperature
floating point number
Default: 0.000000
-T_GRADIENT: Temperature Lapse Rate
floating point number
Default: 0.650000
-C_FACTOR: C Factor
floating point number
Default: 1.000000