NOAA-AVHRR在植被动态监测中的非朗伯体问题(英文)

The nonLambertian Problem in the Dynamic Minitoring of Vegetation by NOAAAVHRR

当今ＮＯＡＡＡＶＨＲＲ能提供许多多角度的对地观察资料。它的非朗伯体效应已经被细心收集的连续的ＡＶＨＲＲ图象所证实。它的相对方差值不大于３０％。这既不大得令人惊奇，但它亦不可能被忽视。该文提供了一个初步的研究报告，关于在混合象元分解方法，植被和土壤的ＢＲＤＦ模型基础上如何纠正非朗伯体效应的初步结果。结果表明我们的方法基本上是正确的并且是可行的。由于非朗伯体效应与其他问题，比如大气效应，纠缠在一起，所以进一步的研究仍然是必要的。

At present NOAAAVHRR can offer us many multiangle earth observation data.through careful collection of successive AVHRR images, the existence of nonLambertian effect had been proven. Its relative variance will not be larger than 30%. It is not surprising large,but it can not be neglected too. This paper reports an initial study about how to correct the nonLambertian effect through building up BRDF models for vegetation and soil background and with the help of decomposing method of mixed pixel.Results show our method is basically correct and practical. Further study is still needed because of the effect of nonLambertian mixed with other problems, such as atmospheric correction.