冰面湖,NDWIice,形态规则,傅里叶描述子,分水岭算法
," /> 冰面湖,NDWIice,形态规则,傅里叶描述子,分水岭算法
,"/> <span>基于光谱形态信息的冰面湖精细化提取方法</span>

吉林大学学报(地球科学版) ›› 2023, Vol. 53 ›› Issue (1): 307-319.doi: 10.13278/j.cnki.jjuese. 20220049

• 地球探测与信息技术 • 上一篇    下一篇

基于光谱形态信息的冰面湖精细化提取方法

赵彬如1,牛思文2,杨晓彤1,常建芳3   

  1. 1.国家海洋信息中心,天津300012

    2.武汉大学遥感信息工程学院,武汉430000

    3.天津大学电气自动化与信息工程学院,天津300072


  • 收稿日期:2012-03-03 出版日期:2023-01-26 发布日期:2023-04-11

Extraction Method of Fine Boundary of Glacial Lake Based on Spectral Morphological Information

Zhao Binru1, Niu Siwen2, Yang Xiaotong1, Chang Jianfang3   

  1. 1. National Marine Data and Information Service, Tianjin 300012, China

    2. School of Remote Sensing Information Engineering, Wuhan University, Wuhan 430000, China

    3. School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China

  • Received:2012-03-03 Online:2023-01-26 Published:2023-04-11

摘要:

冰面湖是冰盖水文系统的重要组成部分,能够反映冰盖表面融水的特征,影响极地气候及环境变化。本文以冰面湖多发育区域格陵兰岛北部为研究区,基于WorldView-2高分辨率遥感影像,提出了一种综合光谱形态信息的冰面湖精细化提取方法。首先结合适合冰面环境的水体指数NDWIice(normalized difference water index-ice)及分割阈值提取冰面水体;然后构建形态规则,将冰面水体分为独立冰面湖、独立冰面径流、混合区域3类;最后引入傅里叶描述子辅助分水岭算法精细化提取冰面湖。为验证该方法的可行性,选取一个消融期内9个时期的WorldView-2影像序列进行实验,与其他自动化方法及人工数字化结果比较,本文方法在提取准确率、完整性上均高于90%,平均错误率低于0.2%,优势明显。


关键词: 冰面湖')">

冰面湖, NDWIice, 形态规则, 傅里叶描述子, 分水岭算法

Abstract:

Supraglacial lake is an important part of the ice sheet hydrological system, which can reflect the characteristics of ice sheet surface meltwater and influence the polar climate and environmental changes. In this paper, a fine extraction method of the supraglacial lake by spectral information and morphology information in northern Greenland is proposed based on WorldView-2 images. Firstly, the ice surface water was segmented from ice with index of water body suitable for ice environment NDWIice and threshold. Then, the ice surface water is divided into three types: Independent supraglacial lake, independent supraglacial runoff and mixed area, by morphological rules. Finally, Fourier descriptor-assisted watershed algorithm is introduced to extract the ice lake. In order to verify the feasibility of the method, WorldView-2 image sequences of nine periods in one ablation period were selected for experiment. Compared with other automated methods and manual digitalization results, the extraction accuracy and integrity of the proposed method are higher than 90%, and the average error rate is lower than 0.2%, which shows obvious advantages.


Key words:  supraglacial lake, normalized difference water index-ice, morphological rule, Fourier descriptor, watershed algorithm

中图分类号: 

  • P407.8
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