Convert radiances / irradiances to equivalent output quantity.
output_quantity quantity
where quantity can be one of the following:
- brightness
-
Convert radiances / irradiances to equivalent brightness temperatures.
- reflectivity
-
Calculate transmission / reflectivity instead of absolute quantities. For irradiances / actinic fluxes the transmission T is defined as
(1) where
is the irradiance / actinic flux,
is the extraterrestrial flux, and
is the solar zenith angle. The reflectivity R is defined as
(2) where
is the radiance,
is the extraterrestrial flux, and
is the solar zenith angle. Obviously, reflectivities do not depend on Sun-Earth distance. Please note the difference to transmittance.
- transmission
-
Calculate transmittance / reflectance instead of absolute quantities. That is, set the extraterrestrial irradiance to 1 and do not correct for Sun-Earth distance:
(3) where
is the irradiance / actinic flux / radiance and
is the extraterrestrial flux. Please note the difference to reflectivity.