Tool Land Surface Temperature (Lapse Rates)
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.
- Author: O.Conrad (c) 2008
- Menu: Terrain Analysis|Climate and Weather
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 | LAI_MAX | - | Minimum: 0.010000
Default: 8.000000 |
| Elevation | Floating point | Z_REFERENCE | - | Default: 0.000000 |
| Temperature | Floating point | T_REFERENCE | Temperature at reference station in degree Celsius. | Default: 0.000000 |
| Temperature Lapse Rate | Floating point | T_GRADIENT | Vertical temperature gradient in degree Celsius per 100 meter. | Default: 0.650000 |
| C Factor | Floating point | C_FACTOR | - | Default: 1.000000 |
| (*) optional |
Command-line
Usage: saga_cmd ta_morphometry 13 [-DEM <str>] [-SWR <str>] [-LAI <str>] [-LAI_MAX <double>] [-LST <str>] [-Z_REFERENCE <double>] [-T_REFERENCE <double>] [-T_GRADIENT <double>] [-C_FACTOR <double>]
-DEM:<str> Elevation
Grid, input
-SWR:<str> Short Wave Radiation Ratio
Grid, input, optional
-LAI:<str> Leaf Area Index
Grid, input, optional
-LAI_MAX:<double> Maximum LAI
Floating point
Minimum: 0.010000
Default: 8.000000
-LST:<str> Land Surface Temperature
Grid, output
-Z_REFERENCE:<double> Elevation
Floating point
Default: 0.000000
-T_REFERENCE:<double> Temperature
Floating point
Default: 0.000000
-T_GRADIENT:<double> Temperature Lapse Rate
Floating point
Default: 0.650000
-C_FACTOR:<double> C Factor
Floating point
Default: 1.000000