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冰川冻土 ›› 2023, Vol. 45 ›› Issue (4): 1428-1436.doi: 10.7522/j.issn.1000-0240.2022.0360

• 冰冻圈技术 • 上一篇    

山地冰川中流线自动提取方法研究

张一新1,2,3(), 周建民2,3(), 桑文刚1(), 李震2,3, 黄磊2,3, 鲁安新2,3   

  1. 1.山东建筑大学 测绘地理信息学院, 山东 济南 250101
    2.可持续发展大数据国际研究中心, 北京 100094
    3.中国科学院 空天信息创新研究院 数字地球重点实验室, 北京 100094
  • 收稿日期:2022-04-09 修回日期:2022-08-25 出版日期:2023-08-31 发布日期:2023-09-26
  • 通讯作者: 周建民,桑文刚 E-mail:3311603830@qq.com;zhoujm@aircas.ac.cn;sang@sdjzu.edu.cn
  • 作者简介:张一新,硕士研究生,主要从事冰川参数遥感提取研究. E-mail: 3311603830@qq.com
  • 基金资助:
    国家自然科学基金面上项目(42071084);中国科学院略性先导科技专项(A类)(XDA20060201)

Research on automatic extraction method of mountain glacier centerlines

Yixin ZHANG1,2,3(), Jianmin ZHOU2,3(), Wengang SANG1(), Zhen LI2,3, Lei HUANG2,3, Anxin LU2,3   

  1. 1.School of Surveying and Geo-Informatitcs,Shandong Jianzhu University,Jinan 250101,China
    2.International Research Center of Big Data for Sustainable Devalopment Goals,Beijing 100094,China
    3.Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China
  • Received:2022-04-09 Revised:2022-08-25 Online:2023-08-31 Published:2023-09-26
  • Contact: Jianmin ZHOU, Wengang SANG E-mail:3311603830@qq.com;zhoujm@aircas.ac.cn;sang@sdjzu.edu.cn

摘要:

冰川是冰冻圈的重要组成部分,被誉为气候变化的“指示器”和“预警器”。而冰川中流线则是反映冰川几何形态的关键参数之一,是确定冰川长度随时间变化、分析冰川运动速度场和估算冰川体积等的一个重要参量。本文基于泰森多边形法,结合冰川表面地形特征,从形态学角度提出了一种山地冰川中流线自动化快速提取的新方法。本方法根据数字高程模型数据分别以冰川矢量边界线上局部最高点和最低点为起始点和终点,并结合提取冰川中心线的方法提取冰川的中流线。将本方法应用于青藏高原1 014条山地冰川中,自动生成了相应的冰川中流线2 114条,提取成功率为100%。通过将本文所提方法与Kienholz方法所提取的冰川中流线的平均长度进行比较,发现本文方法和Kienholz方法所提取冰川中流线的平均长度比为0.98,具有很高的一致性。另外,对于不同类型冰川的中流线提取,我们引入了Zhang方法和Kienholz方法与本文方法的提取结果进行了对比,结果表明本方法提取结果覆盖更全。本文所提方法可基于冰川编目数据中的冰川矢量边界线数据和数字高程模型数据,在无人工参与的情况下,实现对冰川中流线的自动化快速提取。

关键词: 山地冰川, 中流线, 中心线, 泰森多边形, 冰川矢量边界线

Abstract:

Glacier is an important part of the cryosphere and is known as the "indicator" and "early warning device" of climate change. Under the influence of its own gravity, the glacier will move from the high-altitude area to the low-altitude direction to form the glacier ice flow. The maximum flow trajectory of the glacier ice is called the glacier mainstream line. The centerline of the glacier is the center line of the main stream line of the glacier and one of the key parameters to reflect the geometric shape of the glacier. It has important significance in measuring the change of the glacier length with time, analyzing the change characteristics of the glacier movement speed, estimating the glacier volume and building a one-dimensional glacier model. Based on the Tyson Polygon method, combined with the shortest distance formula and Dijkstra algorithm, according to the topographic characteristics of the glacier surface, this paper proposes a new method for automatic and rapid extraction of glacier centerlines in mountain glaciers from the perspective of morphology. This method encrypts the glacier vector boundary line according to the area of different glacier’s using empirical parameters, and combines the digital elevation model data to extract the glacier center line using the Tyson Polygon method with the lowest point and the local highest point on the glacier vector boundary line as the end point and the starting point. At the same time, the extracted local highest point is screened using the shortest distance formula, and only the point with the highest elevation is reserved as the starting point of the glacier centerline, In order to avoid the problem of multiple starting points of the glacier centerlines, the Dijkstra algorithm is used to filter the extracted glacier centerlines with the distance between the starting point and the end point as the weight, and only the shortest distance between the starting point and the end point is retained as the final center glacier centerline extraction result. This method was applied to 1 014 mountain glaciers in the Qinghai Tibet Plateau, and 2 114 corresponding glacier centerlines in glaciers were automatically generated, with an average length of 3.13 km and an extraction success rate of 100%. By comparing the proposed method with the methods of Kienholz et al., Zhang et al., it is found that the extraction results of the proposed method and the method of Kienholz et al., Zhang et al., have little difference for the simple structure of the single valley glacier. For compound valley glaciers and slope glaciers with more complex structures, the number of glacier centerlines extracted by the proposed method is more than that by Kienholz et al., but less than that by Zhang et al., and for ice cap glaciers, the number of glacier lines extracted by the proposed method is more than that by Kienholz et al., Zhang et al. The results show that the glacier centerline extracted by this method has a more complete coverage, and the average length ratio of the glacier centerline extracted by this method and Kienholz's method is 0.98, which has a high consistency. This paper proposes a method of extracting the glacier centerline based on Tyson Polygon method, which takes the data of the digital elevation model and the boundary line of the glacier vector in the glacier catalog data as the input, can realize the automatic and rapid extraction of the glacier centerline without manual participation, and can also accurately extract the centerline in the tributaries of the glacier. This method solves the problem that only a single center line can be extracted based on the glacier axis method, and improves the extraction efficiency of glacier centerline.

Key words: mountain glacier, glacier centerline, centerline, Tyson Polygon, glacier outlines

中图分类号: 

  • P343.6