卫星TM影像阴影消除方法的探讨

地形决定了地面电磁波反射的强弱,反射的强弱又决定了被动遥感影像的质量。卫星影像的阴影与地形密切相关,山势越陡峭,影像阴影越多。云南省菜阳河保护区山高坡陡,TM卫星影像的阴影也相对增加,占10%以上。这给判读带来了很大的不便。本文利用阴阳坡归一化探讨了地形阴影消除的方法,并在菜阳河保护区及其它保护区影像阴影消除中取得了很好的效果。

Study on TM Image Shadow Elimination by Sunlit and Shadow Normalization

The quantity of the EM energy that reflected from the ground decided the quality of the satellite image of passive remote sensing. And the reflection of the ground has close relation with its topography. The more complex of the topography the more shadowy there are in the satellite image. The topography of Caiynaghe Nature Reserve of Yunnan is very complex and there are more than 10% shadows in the TM image. It limited the applying and developing of RS technology in Yunnan province. We tried the sunlit and shadow normalization to eliminate shadows caused by topography. It turned out quite good in imagine enhancement of Caiyanghe Nature Reserve and later applying in Wuliangshan Nature Reserve.