SAGA 9.4.2 | Tool Library Documentation

Land Surface Temperature (Lapse Rates)


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


Parameters

 NameTypeIdentifierDescriptionConstraints
InputElevationgrid, inputDEM--
Short Wave Radiation Ratiogrid, input, optionalSWRThe ratio of daily total short-wave irradiance on sloping sites compared to horizontal sites.-
Leaf Area Indexgrid, input, optionalLAI--
OutputLand Surface Temperaturegrid, outputLST--
OptionsGrid Systemgrid systemPARAMETERS_GRID_SYSTEM--
Maximum LAIfloating point numberLAI_MAX-Minimum: 0.010000 Default: 8.000000
Elevationfloating point numberZ_REFERENCE-Default: 0.000000
Temperaturefloating point numberT_REFERENCETemperature at reference station in degree Celsius.Default: 0.000000
Temperature Lapse Ratefloating point numberT_GRADIENTVertical temperature gradient in degree Celsius per 100 meter.Default: 0.650000
C Factorfloating point numberC_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