Page 1 of 1
output nLw using POLYMER
Posted: Mon Apr 11, 2022 2:58 pm
by gbourdin
Hi all,
Is there any way to output nLw using POLYMER?
Best,
Guillaume
Re: output nLw using POLYMER
Posted: Fri May 06, 2022 8:37 am
by fsteinmetz
Dear Guillaume,
Not directly - to get the normalized water leaving radiance, you would have to multiply the normalized water reflectance provided by Polymer, by F0 (extraterrestrial solar irradiance at mean Sun-Earth distance) and divide by pi.
Cheers,
François
Re: output nLw and Ed using POLYMER
Posted: Mon Aug 29, 2022 7:00 pm
by gbourdin
Hi François,
Thank you I managed to get nLw from Rw and the extraterrestrial solar flux.
I am now trying to get Ed(0-).
I would need to account for tau_rayleigh, tau_gases and tau_aerosol to attenuate F0 through the atmosphere. I believe I can get tau_rayleigh from the surface pressure (sp), and tau gases from total column ozone (tco3) and total column water vapour (tcwv) in the ancillary data files, but I would also need tau_aerosol that is probably used somewhere in "run_atm_corr" to correct for aerosols.
Is there an easy way to get tau_aerosol from Polymer or an easier way to get Ed directly?
Thank you,
Guillaume