Tool Land Surface Temperature
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, 33, 195-226.
- 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 (optional input) | SWR | The ratio of daily total short-wave irradiance on sloping sites compared to horizontal sites. | - | |
| Leaf Area Index (*) | Grid (optional input) | 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 (optional input) -LAI:<str> Leaf Area Index Grid (optional input) -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