We provide a new tool in frads, called gencolorsky, that enables you to generate a color sky description using libRadtran. You’ll need to install libRadtran first in order to use this tool. You’ll need to also install the supplemental Optical Properties for Aerosol and Clouds (OPAC) data if you want to use the standard aerosol profile demonstrated below. After installing libRadtran, you can simply run pip install -U frads to install frads, and gencolorsky will be available to you in command-line. Refer to documentation here for more details.
Here are some sample inputs/outputs from gencolorsky (human adaptation filter applied):
Mid-latitude summer, 12:00, cloud cover = 0, aerosol = continental clean.
gencolorsky 2022 06 21 11 0 -a 37.7 -o 122.2 -m 120 -l continental_average
Mid-latitude summer, 12:00, cloud cover = 0, aerosol = continental polluted.
gencolorsky 2022 6 21 12 0 -a 37.7 -o 122.2 -m 120 -l continental_polluted
Mid-latitude winter, 11:00, cloud cover = 0, desert aerosol profile at 2km altitude
gencolorsky 2022 12 21 11 0 -a 36 -o 106 -m 105 -u 2 -l desert
Mid-latitude summer, 18:30, cloud cover = 0.2, aerosol = continental_average
gencolorsky 2022 6 21 18 30 -a 37.7 -o 122.2 -m 120 -l continental_average -b .2
Mid-latitude summer, 18:30, cloud cover = 0.2, aerosol = continental_average, output in photopic (CIE-Y), melanopic(EDI), and solar for each of the three-channel.
gencolorsky 2022 6 21 18 30 -a 37.7 -o 122.2 -m 120 -l continental_average -b .2 -i