bigleaf (version 0.7.0)

radiometric.surface.temp: Radiometric Surface Temperature

Description

Radiometric surface temperature from longwave radiation measurements.

Usage

radiometric.surface.temp(data, LW_up = "LW_up", LW_down = "LW_down",
  emissivity, constants = bigleaf.constants())

Arguments

data

Data.frame or matrix containing all required input variables

LW_up

Longwave upward radiation (W m-2)

LW_down

Longwave downward radiation (W m-2)

emissivity

Emissivity of the surface (-)

constants

sigma - Stefan-Boltzmann constant (W m-2 K-4) Kelvin - conversion degree Celsius to Kelvin

Value

a data.frame with the following columns:

Trad_K

Radiometric surface temperature (K)

Trad_degC

Radiometric surface temperature (degC)

Details

Radiometric surface temperature (Trad) is calculated as:

$$Trad=((L{W}_{u}p-(1-ϵ)\ast L{W}_{d}own)/(\sigma ϵ){)}^{(}1/4)$$

References

Wang, W., Liang, S., Meyers, T. 2008: Validating MODIS land surface temperature products using long-term nighttime ground measurements. Remote Sensing of Environment 112, 623-635.

Examples

# NOT RUN {
# determine radiometric surface temperature for the site DE-Tha in June 2014 
# assuming an emissivity of 0.98.
# (Note that variable 'LW_down' was only included for the DE-Tha example dataset
# and not for the others due restrictions on file size) 
Trad <- radiometric.surface.temp(DE_Tha_Jun_2014,emissivity=0.98)
summary(Trad)

# }