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在高山峡谷地区湖泊水体提取过程中,山体阴影对水体的干扰一直以来是个难题,虽然利用谱间关系法或控制阈值范围等基于光谱的方法可以去除部分阴影,但实际效果并不理想,而且会损失湖泊边界的完整性,甚至漏提部分湖泊。通过光谱特征先提取较为完整的湖泊水体,再利用空间位置关系去除阴影,实现了既保留较为完整的湖泊,又能够高效去除阴影干扰的目的。在保留完整湖泊的基础上,经过对提取参数的调整,地形起伏较大的山地样区的综合提取效果达到了去除90%以上阴影的效果。
During the process of water extraction from lakes and mountains in the mountainous gorge area, the interference of mountain shadows on water bodies has always been a problem. Although spectrum-based methods such as spectral relationships or control thresholds can remove some shadows, the actual results are not satisfactory and Lost the integrity of the boundary of the lake, even missing part of the lake. By using spectral features to extract relatively complete lake water and then remove the shadow by using the spatial position relationship, the lake can be completely preserved and the shadow interference can be effectively removed. On the basis of preserving intact lakes, after comprehensively adjusting the extraction parameters, the comprehensive extraction effect of mountainous areas with large topography fluctuation has achieved the effect of removing more than 90% of the shadow.