融合DEM去除山体阴影的水体提取方法

在高分辨率SAR图像的水体提取中,山体阴影等目标对水体提取的精确度造成较大影响。对此,根据SAR图像中山体阴影的特性,文中提出一种能快速、准确、自动去除山体阴影的水体提取方法。该方法采用一种改进的Otsu法分割DEM数据,将高程值大的数据与水体粗提取的数据进行匹配,从而判定和去除山体阴影部分。提取结果表明,该方法能提高水体提取的精度,有效降低水体提取的虚警率。

Water Extraction Method Combining DEM for Hillshade Removal

In view of the great impact of hillshades on water extraction accuracy of SAR images,this paper proposes a method for quickly,accurately and automatically removing the hillshade in water extraction.This method uses an improved Otsu method to segment the DEM data,and then match the elevation values large data and water crude extract data for determining and removing the hillshade.The experiments show that this method can improve the accuracy of the water extraction with lower water extraction false alarm rate.