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Recently, the National Oceanic and Atmospheric Administration (NOAA) performed sea surface temperature (SST) reanalysis (RAN1) from seven AVHRR/3s onboard NOAA-15 to -19 and Metop-A and -B, from 2002-present using operational L1b input. The time series of clear-sky ocean brightness temperatures (BTs) and derived SSTs were found to be unstable. While the SSTs were empirically stabilized against in...
According to the gray distribution of vignetting image, the method of Gaussian quadrics fitting based on steepest descent method (SDM) is introduced to solve the problem of irregular Gaussian quadrics fitting. By this method, we can achieve the whole gray distribution of images and then correct their vignetting phenomenon. The simulation result of actual images illuminated that the parameters of irregular...
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