As uniform and stable objects, the deep convective clouds (DCCs) can be used to monitor the radiometric stabilities of the VIIRS reflective solar bands (RSBs) as part of the VIIRS SDR calibration efforts. A method of combining the CrIS brightness temperature difference (BTD) between the water vapor absorption channel and IR window channel to its measurement noise ratio (BTD to noise, or BNR) is used for DCC identification for all VIIRS RSB (M01-M11 and I01-I03, M06 is excluded due to saturation over DCC). The angular distribution models (ADMs) are applied to correct the anisotropy effect in the TOA reflectance. This website shows the time series of daily and weekly reflectance of DCCs, along with the mean and mode, their standard deviations (STD) and ranges (maximum-minimum), for SNPP since January 2017, NOAA-20 since February 2018, and their side-by-side comparison for the most recent one year. For the monthly time series of the whole SNPP mission lifetime, please refer to
This project is supported by STAR VIIRS SDR program (Changyong Cao, Chris Moeller, and Jun Li)
If you have any question about this website, please contact Zhenglong Li.