距平植被指数模型
（1） 遥感方程：
式中，
是带宽为r时的归一化仪器输出；
为仪器的光谱响应；
和
分别为光谱通道上、下限；
为某一象点的入射辐射；
为大气透过率；
为大气程辐射；
为卫星天顶角；z为太阳天顶角；
为太阳方位角；
为卫星方位角。
（2） 旬距平函数ATNDVI模型：
式中，TNDVI为当年该旬的植被指数值；
为同旬各年的归一化植被指数的平均值
（3） 月距平植被指数AMTNDVI模型：
式中，MTNDVI为该月的植被指数值；
为同月各年的归一化植被指数的平均值。
参考文献
陈维英，肖乾广，盛永伟：距平植被指数在1992年特大干旱检测中的应用。环境遥感，1994，9（2）
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