极地研究

极地研究 ›› 2023, Vol. 35 ›› Issue (3): 383-391.DOI: 10.13679/j.jdyj.20220413

• 研究论文 • 上一篇    下一篇

基于ICESat-2卫星测高的南极冰盖1 km数字高程模型

范艺培1  王泽民2,3  张保军2,3   

  1. 1武汉大学测绘遥感信息工程国家重点实验室，湖北 武汉 430079;
    2武汉大学中国南极测绘研究中心, 湖北 武汉 430079;
    3武汉大学极地环境监测与公共治理教育部重点实验室，湖北 武汉 430079
  • 出版日期:2023-09-30 发布日期:2023-09-30
  • 通讯作者: 张保军
  • 作者简介:范艺培, 男, 2001年生。硕士研究生, 主要从事卫星大地测量数据处理。E-mail: 2498841534@qq.com
  • 基金资助:
    国家自然科学基金(42006184, 41941010)和武汉大学大学生创新创业训练计划项目(S202210486206)资助

A 1-km digital elevation model of the Antarctic ice sheet inferred from ICESat-2 altimetry

Fan Yipei1, Wang Zemin2,3, Zhang Baojun2,3   

  1. 1The State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing,Wuhan University, Wuhan 430079, China;
    2Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China;
    3Key Laboratory of Polar Environment Monitoring and Public Governance (Wuhan University),Ministry of Education, Wuhan University, Wuhan 430079, China
  • Online:2023-09-30 Published:2023-09-30

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摘要：

冰盖的数字高程模型(digital elevation model, DEM)是对冰盖形状的刻画, 是研究南极冰盖必不可少的基础数据[1]。然而, 受气候变化影响, 西南极冰盖发生了剧烈的消融, 冰盖的DEM也随之不断地变化。Ice, Cloud and land Elevation Satellite-2(ICESat-2)是美国国家宇航局(National Aeronautics and Space Administration, NASA)于2018年发射的最新一代激光测高卫星, 星上搭载的先进地形激光测高系统(Advanced Topographic Laser Altimeter System, ATLAS)对南极冰盖表面进行了高密度的精确观测。本文利用这一观测数据, 使用最小二乘拟合法制作了1 km×1 km网格的南极冰盖DEM。使用NASA冰桥(IceBridge)计划采集的机载激光雷达测高数据评估发现, 随着冰盖表面坡度的降低, 该DEM的精确度逐渐提高。整体来看, 该ICESat-2 DEM与IceBridge高程数据的差值的中位数、均方根和十分位距分别为–0.45 m, 17.51 m和17.93 m。在不同坡度范围内, 该ICESat-2 DEM的精确度均优于前人基于 ICESat-2 数据所得到的南极冰盖的 DEM。

关键词:

数字高程模型, ICESat-2, 南极冰盖

Abstract:

A digital elevation model (DEM) describes the shape of an ice sheet. It is a particularly essential data to study the Antarctic ice sheet. However, because of climate change, the West Antarctic ice sheet has suffered drastic melting that induced marked modifications of its DEM changes. Ice, Cloud and land Elevation Satellite-2 (ICESat-2) is the latest-generation satellite laser altimetry. It was launched in 2018 by the National Aeronautics and Space Administration (NASA). The onboard Advanced Topographical Laser Altimeter System (ATLAS) acquires high-density, high accuracy observations of the Antarctic ice sheet. In this study, a new DEM of the Antarctic ice sheet established by spatio-temporal fitting of ICESat-2 elevation measurements onto a high-resolution grid with a cell size of 1 km×1 km. The median, root-mean-square and decile interval of the differences between the ICESat-2 DEM derived in this study and IceBridge elevation data were –0.45 m, 17.51 m, and 17.93 m, respectively. In different slope bands, the ICESat-2 DEM accuracy was higher than that of a previous DEM also derivedo from ICESat-2 data.

Key words:

digital elevation model, ICESat-2, Antarctic ice sheet