大气校正模型
式中，L（λ）是卫星传感器记录的辐射；Lr（λ）是Rayleigh路径辐射；La（λ）是气溶胶的路径辐射；Ls（λ）是发自表面的辐射；t（λ，θ）是从像素点到传感器的漫射投射率；λ是考虑波段的中心波长；θ是表面局部法向与像素到传感器方向间的夹角；其计入了地球类球形状的影响。
式中，对Rayleigh散射x=r，对气溶胶x=a；μ=cos θ；μ0=cos θ0，θ0是太阳顶角；E0（λ）是对太阳地球距离变化进行了校正的大气顶部的太阳辐射；Toz（λ，μ，μ0）是下行的太阳辐射和上行的路径辐射穿过臭氧层的透射率；τx（λ）是光学厚度；Ψ-（Ψ+）是后向（前向）散射角；Px（Ψ）是相函数；ρ（λ）是表面反射系数。
参考文献
Singh S M,Saull R J:大气校正对AVHRR获取的多时段的植被指数动力学解释的影响。Remote Sensing of Environment，1988，25
Atmospheric circulation, generally refers to a world-scale, large-scale atmospheric operation phenomenon, both the average state, including instantaneous phenomena, the level of scale in the thousands of kilometers above the vertical scale of 10km or more, the time scale in a few days. The state of the atmosphere. (Eg, the Eurasian region, the hemisphere, the global), the atmospheric movement of a certain atmosphere (such as the troposphere, the stratosphere, the middle, the whole atmosphere) in a long period (month, quarter, year, year) Of the average state or a certain period of time (such as a week, during the rain) of the atmospheric movement of the process of change can be called the atmospheric circulation.
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