用于空间对地遥感的一个参数化辐射传输计算模式

A Parameterized Radiative Transfer Model for Spaceborne Remote Sensing Application

一个足够精度的参数化向上亮度模式对空间对地遥感的大气订正应用是很有意义的。依据向上天空亮度对大气散射相函数、光学厚度、太阳天顶角、空间方位和天顶角等有关参数的依赖特性，基于大量的天空亮度数值模拟计算资料，本文发展了一个关于向上天空亮度的参数化模式。３９４４０组的数值模拟对比资料表明，在气溶胶光学厚度τｔ≤１，太阳天顶角小于７２ｏ，μ≤０．４３２（天顶角小于６５ｏ）以及无云的条件下，由现在的参数化的模式所计算的向上亮度的误差一般小于６％。地表反射率越大，参数化模式的精度越高。参数化模式的精度一般随着光学厚度和太阳天顶角的增大而变差。

It is of great importance to develop a simple but exact model for calculating outgoing radiance to the application of atmospheric correction in spaceborne remote sensing Based on relationship of the radiance to such parameters as atmospheric scattering phase function, optical depth, solar zenith angle, viewing azimuth and zenith angle, by using a lot of accurate radiance data, a parameterized model for calculating outgoing radiance is developed According to 39440 sets of comparative numerical simulations, in the condition of the optical depth less than unity, the solar zenith angle of <72 o _ and the viewing zenith angle of <65 o , errors in radiance calculated by the parameterized model are generally less than 6% The larger the surface reflectance, the higher the model accuracy The accuracy gets worse with increasing optical depth and solar zenith angle