| 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 |
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| 引用本文： | 刘卓,李佳,张翔,郭磊,刘艳阳,徐浩栋,顾云杨,陈重华.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[J].测绘通报,2022,0(4):72-76. |
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| 作者姓名： | 刘卓 李佳 张翔 郭磊 刘艳阳 徐浩栋 顾云杨 陈重华 |
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| 作者单位： | 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 |
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| 基金项目： | 国家自然科学基金(41904006)；;湖南省自然科学基金(2019JJ50761)； |
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| 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。
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| 关 键 词： | 南极 数字高程模型 TanDEM-X 差分干涉 ICESat-2 |
| 收稿时间： | 2021-05-18 |
Obtaining high-precision digital elevation model in Antarctica based on TanDEM-X images and ICESat-2 data |
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| LIU Zhuo,LI Jia,ZHANG Xiang,GUO Lei,LIU Yanyang,XU Haodong,GU Yunyang,CHEN Chonghua.Obtaining high-precision digital elevation model in Antarctica based on TanDEM-X images and ICESat-2 data[J].Bulletin of Surveying and Mapping,2022,0(4):72-76. |
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| Authors: | LIU Zhuo LI Jia ZHANG Xiang GUO Lei LIU Yanyang XU Haodong GU Yunyang CHEN Chonghua |
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| Institution: | 1. School of Geosciences and Info-physics, Central South University, Changsha 410083, China;2. Laboratory of GeoHazards Perception, Cognition and Predication, Central South University, Changsha 410083, China;3. Shanghai Satellite Engineering Research Institute, Shanghai 200090, China |
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| Abstract: | 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. |
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| Keywords: | Antarctica digital elevation model TanDEM-X D-InSAR ICESat-2 |
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