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NDWI_(ice)(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。
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 NDWI_(ice)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.
作者
赵彬如
牛思文
杨晓彤
常建芳
Zhao Binru;Niu Siwen;Yang Xiaotong;Chang Jianfang(National Marine Data and Information Service,Tianjin 300012,China;School of Remote Sensing Information Engineering,Wuhan University,Wuhan 430000,China;School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China)
出处
《吉林大学学报（地球科学版）》
CAS
CSCD
北大核心
2023年第1期307-319,共13页
Journal of Jilin University：Earth Science Edition
基金
科技助力经济2020重点专项(SQ2020YFF0426316)
国家海洋信息中心青年科学基金项目(202001003)
关键词
冰面湖
NDWIice
形态规则
傅里叶描述子
分水岭算法
supraglacial lake
normalized difference water index-ice
morphological rule
Fourier descriptor
watershed algorithm
