摘要:
当前对海洋水色遥感精确瑞利散射的计算均采用查找表方式进行,但由于这些查找表是针对特定遥感器生成的,无法直接应用于新的水色遥感器,给实际应用带来一定程度的麻烦,为此提出了一种通用的海洋水色遥感精确瑞利散射查找表.首先,详细地推导了加倍法解大气矢量辐射传输方程的基本关系式和实际的计算原理.通过与MODIS精确瑞利散射查找表计算结果比较,证明利用加倍法计算瑞利散射的精度优于0.25%,完全能够满足当前海洋水色遥感大气校正对瑞利散射计算精度的要求,并可以用来生成精确瑞利散射查找表.其次,利用加倍法解大气矢量辐射传输方程,生成了一个通用的海洋水色遥感精确瑞利散射查找表,验证结果表明该查找表可用于所有水色遥感器的精确瑞利散射计算,且计算精度优于0.5%.
Abstract:
For the current exact Rayleigh scattering calculation of ocean color remote sensing the look-up-table(LUT) is used,which is created for a special remote sensor and cannot be applied to other sensors.For practical application,a general Rayleigh scattering LUT which can be applied to all the ocean colorremote sensors is produced.The vector radiative transfer equation(VRTE) in a plane-parallel atmosphere with the adding-doubling method is deduced and solved in detail.Comparing with the exact Rayleigh scattering radiance derived from the MODIS exact Rayleigh scattering LUT,it is proved that the relative error of Rayleigh scattering calculation with the adding-doubling method is less than 0.25%,which meets the required accuracy of the at mospheric correction of the ocean colorremote sensing.Therefore,the adding-doubling method can be used to generate the exact Rayleigh scattering LUT for the ocean color remote sensors.Finally,by using the adding-doubling method,the general exact Ray leigh scattering LUT is generated.On the basis of this general LUT,the calculated Rayleigh scattering radiance is tested by comparing with the LUTs of MODIS,SeaWiFS and the other ocean color sensor,showing that relativeerrors are all less than 0.5%,and this general LUT can be applied to all the ocean color remote sensors.
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