极地研究

极地研究 ›› 2020, Vol. 32 ›› Issue (3): 336-342.DOI: 10.13679/j.jdyj.20190063

• 研究论文 • 上一篇    下一篇

基于宽幅SAR的极地冰盖冻融强度提取方法研究

赵梦雪1,2, 傅文学1, 孙燕武1,3, 李新武1   

  1. 1.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;
    2.山东科技大学, 测绘科学与工程学院, 山东 青岛 266590;
    3.安徽理工大学, 测绘学院, 安徽 淮南 232000
  • 收稿日期:2019-10-30 修回日期:2020-01-16 出版日期:2020-09-30 发布日期:2020-09-30
  • 通讯作者: 傅文学
  • 基金资助:

    国家重点研发计划(2016YFB0501501)资助

Extracting freeze/melt extent of Greenland ice sheet from Synthetic Aperture Radar images

Zhao Mengxue1,2, Fu Wenxue1, Sun Yanwu1,3, Li Xinwu1   

  1. 1.Laboratory of Digital Earth Science, Aerospace Information Research Institute, CAS, Beijing 100094, China;
    2.College of Geomatics, Shandong University of Science and Technology, Shandong 266590, China;
    3.College of Geomatics, Anhui University of Science and Technology, Anhui 232000, China.
  • Received:2019-10-30 Revised:2020-01-16 Online:2020-09-30 Published:2020-09-30
  • Contact: Wenxue Fu

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摘要：

极地冰盖冻融强度信息在理解冰盖稳定性及其对气候变化响应中具有重要意义。利用格陵兰岛2016年Sentinel-1A干涉宽幅双极化SAR数据(HH+HV), 结合同时相自动气象站点温度和MODIS温度产品数据, 研究了HH、HV极化幅度值及HH/HV比值与冻融强度的相关关系。结果表明冻融强度与HH、HV极化幅度值呈负相关关系, 而与HH/HV值呈正相关关系, 且与HH/HV值的相关性更好, R2值约0.610。基于MODIS温度产品建立了冰盖冻融强度划分的5个HH/HV区间阈值, 最后通过MODIS温度产品的结果验证表明, 利用HH/HV值的冻融强度提取精度为86.8%。

关键词: 格陵兰岛, 冰盖冻融, 冻融强度, 宽幅SAR

Abstract:

Data on freezing and melting of polar ice sheets are important for understanding ice sheet stability and ice sheet response to climate change. We examined relationships between ice sheet freeze/melt extent, HH and HV polarization amplitudes and HH/HV values using Sentinel-1A IW SAR images from 2016, AWS data and MODIS temperature products. We found that freeze/melt extent is negatively correlated with HH and HV polarization amplitudes and positively correlated with HH/HV value, and R2 is higher in the correlation with HH/HV value (> 0.6) than that with polarization amplitudes. Using MODIS temperature products, we established five HH/HV thresholds to measure freeze/melt extent of the Greenland ice sheet. Using MODIS temperature products, we found that the accuracy of extracting freeze/melt extent using HH/HV value is 86.8%.

Key words: Greenland, freezing and melting in ice sheet, freeze/melt extent, IW SAR