SAGA-GIS Tool Library Documentation (v7.8.2)

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


Parameters

 NameTypeIdentifierDescriptionConstraints
InputElevationGrid, inputDEM--
Short Wave Radiation Ratio (*)Grid, input, optionalSWRThe ratio of daily total short-wave irradiance on sloping sites compared to horizontal sites.-
Leaf Area Index (*)Grid, input, optionalLAI--
OutputLand Surface TemperatureGrid, outputLST--
OptionsGrid SystemGrid systemPARAMETERS_GRID_SYSTEM--
Maximum LAIFloating pointLAI_MAX-Minimum: 0.010000
Default: 8.000000
ElevationFloating pointZ_REFERENCE-Default: 0.000000
TemperatureFloating pointT_REFERENCETemperature at reference station in degree Celsius.Default: 0.000000
Temperature Lapse RateFloating pointT_GRADIENTVertical temperature gradient in degree Celsius per 100 meter.Default: 0.650000
C FactorFloating pointC_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