李斐^1,2,,
郭云熙¹,
张宇^1,,,
朱婷婷²,
张胜凯¹
1. 武汉大学中国南极测绘研究中心, 武汉 430079
2. 武汉大学测绘遥感信息工程国家重点实验室, 武汉 430079

基金项目: 国家重点研发计划项目（2017YFA0603104），国家自然科学基金项目（41801266，41901275），中国博士后面上资助二等资助（2017M612512，2018M632922），测绘遥感信息工程国家重点实验室专项科研经费资助


详细信息

作者简介: 李斐, 男, 1960年生, 教授, 博士生导师, 主要从事卫星大地测量, 地球物理方面研究.E-mail:fli@whu.edu.cn

通讯作者: 张宇, 男, 特聘副研究员, 主要从事极地遥感方面研究.E-mail:yuzhang_spl@whu.edu.cn

中图分类号: P228

收稿日期:2019-06-10
修回日期:2020-08-28
上线日期:2020-11-05

Grounding line extraction in the Amery ice shelf, Antarctic using fusion of CryoSat-2 altimetry data and Landsat 8 optical data

LI Fei^1,2,,
GUO YunXi¹,
ZHANG Yu^1,,,
ZHU TingTing²,
ZHANG ShengKai¹
1. Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China
2. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote sensing, Wuhan University, Wuhan 430079, China


More Information

Corresponding author: ZHANG Yu,E-mail:yuzhang_spl@whu.edu.cn

MSC: P228

--> Received Date: 10 June 2019
Revised Date: 28 August 2020
Available Online: 05 November 2020


摘要
摘要:本文利用CryoSat-2测高数据与Landsat 8光学数据，针对南极Amery冰架区域开展接地线提取研究.首先通过Landsat 8光学影像三次Hermite多项式插值处理，在坡度分析的基础上利用表面曲率改进方法获取接地线特征点；同时对CryoSat-2测高数据进行坡度分析和表面曲率计算，通过沿轨梯度分析方法提取接地点；最后将Landsat 8与CryoSat-2数据获取的接地点进行最小二乘融合得到融合接地线.实验结果表明，融合结果利用高空间分辨率光学数据不仅能保证接地线提取精度，同时测高数据还能够弥补光学数据受云遮挡导致的数据空缺，保持接地线的完整性.与MOA产品比较可以看出，融合数据点与MOA接地线平均距离为367 m，标准差为601 m，所有数据点中距离小于1 km的点占总数的93.19%，与MOA产品具有较好一致.本文提出的融合算法可以实现空间连续的接地线提取结果，对后续研究南极物质平衡、冰流速计算等具有重要的意义.
关键词: Landsat 8/
CryoSat-2测高/
坡度分析/
表面曲率/
最小二乘融合

Abstract:In this work, fusion of CryoSat-2 altimetry data and Landsat 8 data is applied to grounding line extraction in the Amery ice shelf area, Antarctic. Firstly, based on the 3-order Hermit polynomial interpolation processing of Landsat 8 optical images, the slope analysis is carried out to obtain the revised feature points using surface curvature. For the Cryosat-2 data, grounding point is extracted by using the along track gradient analysis after slope and surface curvature calculation. Finally, the least squares based fusion method is utilized to obtain the fusion grounding line. The results show that the fusion grounding line can guarantee the accuracy compared with optical data results, and the altimetry data are not affected by the cloud that can ensure the integrity of the grounding line. Compared with the Mosaic of Antarctica (MOA) product, the average distance between the fusion data points and the MOA grounding line is 367 m, and the standard deviation is 601 m. Points less than 1 km away from all data points account for 93.19% in total, which indicates the good agreement with the MOA product. The fusion algorithm maintains the grounding line characteristics extracted by Landsat 8, and the visual performance of overall results are also improved. It is of great importance for subsequent research on the Antarctic mass balance, ice velocity calculation and so on.
Key words:Landsat 8/
CryoSat-2 altimetry/
Slope analysis/
Surface curvature/
Feature least squares fusion



PDF全文下载地址:

http://www.geophy.cn/data/article/export-pdf?id=5fed3364bfedb50717e0ce3a