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    基于Sentinel-1和DEM数据的南岭高植被覆盖区地形线性特征提取方法

    鲁泽恩 田玉刚 柳庆威 王晶 朱宁 徐亚东

    鲁泽恩, 田玉刚, 柳庆威, 王晶, 朱宁, 徐亚东, 2021. 基于Sentinel-1和DEM数据的南岭高植被覆盖区地形线性特征提取方法. 地球科学, 46(4): 1349-1358. doi: 10.3799/dqkx.2020.351
    引用本文: 鲁泽恩, 田玉刚, 柳庆威, 王晶, 朱宁, 徐亚东, 2021. 基于Sentinel-1和DEM数据的南岭高植被覆盖区地形线性特征提取方法. 地球科学, 46(4): 1349-1358. doi: 10.3799/dqkx.2020.351
    Lu Zeen, Tian Yugang, Liu Qingwei, Wang Jing, Zhu Ning, Xu Yadong, 2021. Topographical Linear Feature Extraction Method Based on Sentinel-1 and DEM in Areas with High Vegetation Coverage of Nanling. Earth Science, 46(4): 1349-1358. doi: 10.3799/dqkx.2020.351
    Citation: Lu Zeen, Tian Yugang, Liu Qingwei, Wang Jing, Zhu Ning, Xu Yadong, 2021. Topographical Linear Feature Extraction Method Based on Sentinel-1 and DEM in Areas with High Vegetation Coverage of Nanling. Earth Science, 46(4): 1349-1358. doi: 10.3799/dqkx.2020.351

    基于Sentinel-1和DEM数据的南岭高植被覆盖区地形线性特征提取方法

    doi: 10.3799/dqkx.2020.351
    基金项目: 

    中国地质调查局地质调查项目 DD20190811

    详细信息
      作者简介:

      鲁泽恩(1995-), 男, 硕士研究生, 主要从事资源与环境遥感研究.ORCID: 0000-0003-3308-6990.E-mail: lze@cug.edu.cn

      通讯作者:

      田玉刚, E-mail: ygangtian@cug.edu.cn

    • 中图分类号: P237

    Topographical Linear Feature Extraction Method Based on Sentinel-1 and DEM in Areas with High Vegetation Coverage of Nanling

    • 摘要: 在南岭高海拔山脉、植被茂密等地区开展地质调查难度大,人员和物资难以进入,因此需提前根据该区域的地形线性特征合理设计野外调查路线;此外地形线性特征可为区域构造运动信息的认知提供辅助知识.遥感技术以其宏观性、多尺度、多层次的特点成为地质研究和地质勘查的重要手段,然而在高植被覆盖区,常见的光学影像难以穿透植被,而微波雷达遥感则因为较好的植被穿透性,使得其应用成为可能.因此,提出了一种基于雷达卫星Sentinel-1和数字高程模型(digital elevation model,DEM)数据的地形线性特征提取方法.该方法首先利用似然比边缘检测算法提取Sentinel-1影像中的边缘特征,然后对DEM进行线性特征增强以生成山体阴影影像,再利用Canny边缘检测算子提取DEM数据中的山脊线与山谷线等主要线性特征,以DEM提取出的特征线为中心建立缓冲区并与雷达影像的提取结果做相交处理,将得到的线性特征利用道格拉斯-普克算法进行局部直线拟合,最后得到研究区的地形线性特征.结果表明,该方法综合考虑了雷达影像的微观细节信息和DEM数据的宏观趋势信息,在保留主要线性地形特征的同时剔除了伪边缘和噪声点,提取效果较好.

       

    • 图  1  研究区影像

      Fig.  1.  Images in study area

      图  2  分方向的滑动窗口(Touzi et al., 1988

      Fig.  2.  Sliding windows in different directions (Touzi et al., 1988)

      图  3  检测方向

      Fig.  3.  Detection directions

      图  4  非极大值抑制窗口(Neubeck and Van Gool,2006

      Fig.  4.  Windows for non maximum suppression (Neubeck and Van Gool, 2006)

      图  5  DEM山体阴影

      Fig.  5.  DEM mountain shading

      图  6  基于Sentinel-1和DEM的地形线性特征提取流程

      Fig.  6.  Flowchart of topographical linear feature extraction based on Sentinel-1 and DEM

      图  7  SAR影像地形线性特征提取结果

      Fig.  7.  The topographical linear feature extraction result from SAR images

      图  8  DEM地形线性特征提取结果

      Fig.  8.  The topographical linear feature result from DEM

      图  9  基于DEM水文分析法提取的地形线性特征

      Fig.  9.  The topographical linear feature extracted based on DEM hydrological analysis

      图  10  基于Sentinel-1和DEM提取的地形线性特征

      Fig.  10.  The topographical linear feature extracted based on Sentinel-1 and DEM

      图  11  基于Google Earth影像目视解译的地形线性特征

      Fig.  11.  The topographical linear feature based on visual interpretation of Google Earth images

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