针对HY-1A CCD数据处理的瑞利查找表

Rayleigh Lookup Tables for HY-1A CCD Data Processing

在海洋水色遥感中,瑞利散射占大气顶(TOA)处测量信号的绝大部分,作为大气修正的第一步,必须精确计算瑞利散射的贡献,并从总信号中去除。本文针对HY-1A CCD传感器的波段设置,利用6S模型计算了不同情况下的瑞利反射率;基于计算结果,分析了瑞利反射率的特征,包括大气类型的影响、波长的影响,以及宽波段设置带来的波段平均效应的影响等;构造了针对HY-1A CCD的瑞利反射率查找表,并应用于实际卫星数据处理,初步评估了方法的有效性。

In ocean color remote sensing, Rayleigh scattering dominates the signal measured at the top-ofatmosphere（TOA）. Therefore, as the first step in atmospheric correction, Rayleigh scattering item must be computed accurately and removed from the sensor measured total signal. According to the four bands of HY-1A CCD, Rayleigh reflectance under various conditions is computed using 6S model. Based on the computations, the Rayleigh reflectance features are analyzed, including the effect of atmospheric type, wavelength and band averaging resulting from the broad band width of this sensor. The HY-1A CCD Rayleigh lookup tables are generated, and applied to the remotely sensed data processing with the primary evaluation of its validity.