测绘通报 ›› 2020, Vol. 0 ›› Issue (10): 12-15.doi: 10.13474/j.cnki.11-2246.2020.0310

• 学术研究 • 上一篇    下一篇

利用流水矢量提取山脊线和山谷线特征点的方法

黄炅怡1, 黄培之2, 李坚强2   

  1. 1. 武汉大学遥感信息工程学院, 湖北 武汉 430079;
    2. 深圳大学计算机与软件学院, 广东 深圳 518060
  • 收稿日期:2020-04-27 发布日期:2020-10-29
  • 通讯作者: 黄培之。E-mail:hpz@szu.edu.cn E-mail:hpz@szu.edu.cn
  • 作者简介:黄炅怡(1995-),女,硕士生,主要研究方向为摄影测量与遥感。E-mail:714599128@qq.com。
  • 基金资助:
    国家自然科学基金(61572330)

Feature point extraction of ridge line and valley line from DEM based on falling vector

HUANG Jiongyi1, HUANG Peizhi2, LI Jianqiang2   

  1. 1. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China;
    2. College of Computer Science and Software Engineering, Shenzhen University, Shenzhen 518060, China
  • Received:2020-04-27 Published:2020-10-29

摘要: 本文在深入研究地表曲面函数的流水矢量模型后,根据山脊线具有分水性和山谷线具有合水性的物理特性,利用有关数学原理,推导出山脊点和山谷点是该点流水矢量正交地形断面上局部区域流水矢量模的极小值点;并以此为依据,提出了一种基于地形点流水矢量的山脊线和山谷线特征点的提取方法。该方法将传统的山脊点和山谷点的判别标准合二为一,使算法设计更加简单,程序执行效率得到提高。试验表明,该方法所提取的山脊线和山谷线候选点具有较好的抗噪力,且不受山脊线和山谷线走向的影响,所提取的山脊线和山谷线上的点与实际地形更加吻合。

关键词: 山脊线, 流水矢量, 提取, 极小值, 特征点

Abstract: In this paper, after studying the falling vector of terrain surface function, the falling vector characteristics of ridge point and valley point are derived by using the relevant mathematical principles according to the physical characteristics of the water separation of ridge line and confluence of valley line. A new method of extracting the feature points of ridge line and valley line based on falling vector is proposed after investigating into existing method. This method takes the minimum value of falling vector norm on the vertical section of falling vector as the criterion to determine the ridge point and valley point. The experiment shows that the selected points of ridge line and valley line extracted by this method are more accurate and reliable than the existing method.

Key words: ridge line, falling vector, extraction, minimum, feature point

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