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.
作者
刘卓
李佳
张翔
郭磊
刘艳阳
徐浩栋
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)
出处
《测绘通报》
CSCD
北大核心
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)。
