极地研究

极地研究 ›› 2021, Vol. 33 ›› Issue (2): 250-259.DOI: 10. 13679/j.jdyj.20200031

• 研究论文 • 上一篇    下一篇

两种新的基于遥感影像的南极DEM精度比较与分析

耿通，肖峰，张胜凯，李佳星，宣越，李斐   

  1. 武汉大学中国南极测绘研究中心, 武汉 430079
  • 收稿日期:2020-04-01 修回日期:2020-10-27 出版日期:2021-06-30 发布日期:2021-05-31
  • 通讯作者: 李斐
  • 基金资助:
    国家自然科学基金(41531069, 41706216)，国家重点研发计划(2017YFA0603104)，测绘遥感信息工程国家重点实验室专项科研经费

Comparison and analysis of the accuracy of two new Antarctic DEMs based on remote sensing images

Geng Tong, Xiao Feng, Zhang Shengkai, Li Jiaxing, Xuan Yue, Li Fei   

  1. Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079 China
  • Received:2020-04-01 Revised:2020-10-27 Online:2021-06-30 Published:2021-05-31
  • Contact: Li Fei

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摘要： 南极参考高程模型(Reference Elevation Model of Antarctica, REMA)和TanDEM-X DEM是国际上新发布的两种基于遥感影像的高分辨率数字高程模型(Digital Elevation Model, DEM)。采用Cryosat-2卫星测高数据及冰桥计划机载测高数据对两个数字高程模型在南极冰盖上的精度进行验证比较, 并考虑雷达信号穿透性和坡度等因素进行分析。结果表明: 在南极冰盖范围内,与CryoSat-2数据相比较,REMA的平均高程差为-0.742 m, 标准差为5.269m, TanDEM-X DEM的平均高程差为2.946 m, 标准差为5.755 m>。在南极内陆地区TanDEM-X DEM与冰桥计划数据之间的高程差异略小于冰盖边缘地区的高程差异, 总体高程差异相比于REMA和冰桥计划数据之间的高程差异要更明显。REMA的高程值略高于TanDEM-X DEM的高程值, 两个数字高程模型之间的平均高程差为3.742 m, 标准差为2.807 m, 这与TanDEM-X DEM的数据源使用X波段雷达波对积雪的穿透性有关。

关键词: 南极冰盖, 数字高程模型（REMA）, TanDEM-X DEM

Abstract: The Reference Elevation Model of Antarctica (REMA) and TanDEM-X DEM are two internationally released high-resolution DEMs based on remote sensing images. Cryosat-2 satellite altimetry data and IceBridge airborne altimetry data were used to verify and compare the accuracy of the two DEMs for the Antarctic ice sheet,considering factors such as radar signal penetration and slope. The results show that within the range of the Antarctic ice sheet, compared with CryoSat-2 data, the mean elevation difference of REMA was −0.742 m, the standard deviation was 5.269 m, the mean elevation difference of the TanDEM-X DEM was 2.946 m, and the standard deviation was 5.755 m. The difference in elevation between the TanDEM-X DEM and IceBridge data in the inland area of Antarctica was slightly smaller than the difference in elevation at the edge of the ice sheet. The overall difference in elevation was more obvious than that between the REMA and IceBridge data. The elevation values of REMA were slightly higher than those of the TanDEM-X DEM. The mean elevation difference between the two DEMs was 3.742 m, and the standard deviation was 2.807 m. This was related to the penetration of the snow source of the TanDEM-X DEM data source based on X-band radar waves.

Key words: Antarctic ice sheet, digital elevation model, REMA, TanDEM-X DEM