利用TanDEM-X影像和ICESat-2高程数据获取南极高精度数字高程模型  

Obtaining high-precision digital elevation model in Antarctica based on TanDEM-X images and ICESat-2 data

作　　者：刘卓 李佳[1,2] 张翔[3] 郭磊[1] 刘艳阳 徐浩栋[1,2] 顾云杨 陈重华 LIU Zhuo;LI Jia;ZHANG Xiang;GUO Lei;LIU Yanyang;XU Haodong;GU Yunyang;CHEN Chonghua(School of Geosciences and Info-physics,Central South University,Changsha 410083,China;Laboratory of GeoHazards Perception,Cognition and Predication,Central South University,Changsha 410083,China;Shanghai Satellite Engineering Research Institute,Shanghai 200090,China)

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]中南大学地灾感知认知与预知实验室,湖南长沙410083 [3]上海卫星工程研究所,上海200090

出　　处：《测绘通报》2022年第4期72-72,73-76,共5页Bulletin of Surveying and Mapping

基　　金：国家自然科学基金(41904006);中南大学创新驱动计划(2020CX036,2019CX007);湖南省自然科学基金(2019JJ50761);上海航天科技创新基金(SAST2018-042)。

摘　　要：高精度DEM是南极科学研究的基础地理信息数据之一。德国空间局发布的TanDEM-X双站干涉影像对不仅分辨率高、覆盖范围大,而且具有零时间基线,不受时间去相关、大气变化及地面目标形变的影响。本文基于TanDEM-X双站干涉影像对和迭代差分InSAR技术获取南极高分辨率DEM;然后利用南极ICESat-2高程数据和最小二乘平差方法改正DEM产品的系统性偏移误差,提高DEM产品的绝对精度。真实数据试验结果表明,本文方法可获取分辨率优于5 m、绝对精度优于2 m的南极DEM。High-precision digital elevation model(DEM)is one of the basic geographic information data required for Antarctica scientific research.The TanDEM-X bistatic SAR pairs released by the German Space Agency has the advantages of high-resolution and wide coverage.More importantly,it has a zero temporal baseline,which makes them to be free of time decorrelation,atmospheric variation,and ground deformation.In this paper,we firstly use TanDEM-X images and the iterative differential InSAR technology to obtain high-resolution Antarctic DEM,and then improve the accuracy of the DEM products by correcting the horizontal shift based on the ICESat-2 data and least squares adjustment technology.The research results show that the method can obtain Antarctica DEM with resolution higher than 5 m and absolute precision better than 2 m.

关 键 词：南极 数字高程模型 TanDEM-X 差分干涉 ICESat-2 

分 类 号：P228[天文地球—大地测量学与测量工程]