Removing the Effect of Viewing Zenith Angle in Atmospheric Correction of HJ-1A / B CCD Image

To solve the oversize problem of the Environment and Disaster Monitoring and Forecasting Satellites(HJ-A/B) scanning angle, this article proposed an optimizing algorithm to adjust the effect of the viewing zenith angle in atmospheric correction. This algorithm reduces the classical three - dimensional look up table algorithm to two - dimensional and takes two steps to distributed computing surface reflectance: initially, adjusting the effect of viewing zenith angle on apparent radiance; then calculating the surface reflectance. Comparing this algorithm with the three - dimensional look up table algorithm, the standard deviation between this two algorithms is around 0.01, which indicates that it effectively adjusts the effect of viewing zenith angle. Meanwhile, it reduces the computing time and memory costs since this algorithm reduces the classical three - dimensional look up table algorithm to two - dimensional.