Lw: Estimates downward facing longwave radiation (W/m2)
In gtatters/Thermimage: Thermal Image Analysis
Lw R Documentation
Estimates downward facing longwave radiation (W/m2)
Description
Estimates downward facing longwave radiation (W/m2) using a relationship derived from Gabathuler et al 2001
Usage
Lw(Ta = 20, RH = 0.5, n = 0.5)
Arguments
Ta
Local air temperature (degrees Celsius), ~ 2 m above ground
RH
Local relative humidity (fractional value from 0 to 1)
n
Fractional cloud cover (fractional value from 0 to 1)
Details
An alternative to Ld() for estimating incoming radiation by determining an offset temperature to account for the influence of atmospheric transmission loss. The incoming infrared radiation is estimated using the Stephan-Boltzmann relationship:
emissivity*Stephan Boltzmann constant*T^4
Value
A value, vector of length one, corresponding to the incoming longwave radiation, units: W/m2.
Author(s)
Glenn J Tattersall
References
Gabathuler et al 2001. Parameterization of incoming longwave radiation in high mountain environments. Physical Geography 22: 99-114
See Also
Ld
Examples
# Example calculation:
Ta<-30
RH<-0.5
n<-0
Lw(Ta, RH, n)
gtatters/Thermimage documentation built on June 12, 2025, 10:58 p.m.
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| Lw | R Documentation |
Estimates downward facing longwave radiation (W/m2)
Description
Estimates downward facing longwave radiation (W/m2) using a relationship derived from Gabathuler et al 2001
Usage
Lw(Ta = 20, RH = 0.5, n = 0.5)
Arguments
Ta |
Local air temperature (degrees Celsius), ~ 2 m above ground |
RH |
Local relative humidity (fractional value from 0 to 1) |
n |
Fractional cloud cover (fractional value from 0 to 1) |
Details
An alternative to Ld() for estimating incoming radiation by determining an offset temperature to account for the influence of atmospheric transmission loss. The incoming infrared radiation is estimated using the Stephan-Boltzmann relationship: emissivity*Stephan Boltzmann constant*T^4
Value
A value, vector of length one, corresponding to the incoming longwave radiation, units: W/m2.
Author(s)
Glenn J Tattersall
References
Gabathuler et al 2001. Parameterization of incoming longwave radiation in high mountain environments. Physical Geography 22: 99-114
See Also
Ld
Examples
# Example calculation:
Ta<-30
RH<-0.5
n<-0
Lw(Ta, RH, n)
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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