【摘要】 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。更多还原

【Abstract】 It is a problem that how to eliminate the interference of mountain shadows when we extract the water body in the mountainous areas.The spectrum-based methods such as spectral correlation or spectral threshold controlling may partially remove the shadows.But the real conditions of water body mapping were rather complex,and the above-mentioned methods may underestimate or overestimate the lake water extents based on different thresholds,even missing some lakes.The method proposed in this study firstly uses the spectral feature of water to extract the potential complete lakes,then remove the shadows by differentiating the relationships of spatial position.As a result,we cannot only keep relative complete lakes,but also reduce the interference of mountain shadows efficiently.By adjusting the parameter for minimal size of lake extraction,we can remove more than 90% of the mountain shadows on the premise of saving relatively complete lakes in the high mountain areas.更多还原