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首页> 外文期刊>Journal of geodynamics >A combined multi-interferogram algorithm for high resolution DEM reconstruction over deformed regions with TerraSAR-X data
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A combined multi-interferogram algorithm for high resolution DEM reconstruction over deformed regions with TerraSAR-X data

机译：TerraSAR-X数据在变形区域上高分辨率DEM重构的组合多干涉图算法

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摘要

The accuracy of DEM generated with interferometric synthetic aperture radar (InSAR) technique mostly depends on phase unwrapping errors, atmospheric effects, baseline errors and phase noise. The first term is more serious if the high-resolution TerraSAR-X data over urban regions and mountainous regions are applied. In addition, the deformation effect cannot be neglected if the study regions are suffering from surface deformation within the SAR acquisition dates. In this paper, several measures have been taken to generate high resolution DEM over urban regions and mountainous regions with TerraSAR data. The SAR interferometric pairs are divided into two subsets: (a) DEM subsets and (b) deformation subsets. These two interferometric sets serve to generate DEM and deformation, respectively. The external DEM is applied to assist the phase unwrapping with "remove-restore" procedure. The deformation phase is re-scaled and subtracted from each DEM observations. Lastly, the stochastic errors including atmospheric effects and phase noise are suppressed by averaging heights from several interferograms with weights. Six TerraSAR-X data are applied to generate a 6-m-resolution DEM over Xi'an, China using these procedures. Both discrete GPS heights and local high resolution and high precision DEM data are applied to calibrate the DEM generated with our algorithm, and around 4.1 m precision is achieved.
机译：用干涉合成孔径雷达（InSAR）技术生成的DEM的精度主要取决于相位展开误差，大气效应，基线误差和相位噪声。如果应用了城市地区和山区的高分辨率TerraSAR-X数据，则第一个术语会更严重。此外，如果研究区域在SAR采集日期之内遭受表面变形，则不能忽略变形效应。本文采取了多种措施，利用TerraSAR数据在市区和山区生成高分辨率DEM。 SAR干涉对分为两个子集：（a）DEM子集和（b）变形子集。这两个干涉仪集分别用于生成DEM和变形。外部DEM用于通过“删除-恢复”过程来协助阶段展开。重新缩放变形阶段，并从每个DEM观测值中减去。最后，通过对多个干涉图的权重取平均值，可以抑制包括大气效应和相位噪声在内的随机误差。使用这些程序，使用六个TerraSAR-X数据在中国西安上生成6米分辨率的DEM。离散GPS高度以及本地高分辨率和高精度DEM数据均用于校准通过我们的算法生成的DEM，并实现了约4.1 m的精度。

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  • 来源
    《Journal of geodynamics》 |2012年第10期|p.148-153|共6页
  • 作者

    Chaoying Zhao; Feifei Qu; Qin Zhang; Wu Zhu;

  • 作者单位

    College of Geology Engineering and Geomatics, Chang'an University, No. 126 Yanta Road, Xi'an 710054, China, Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, No. 126 Yanta Road, Xi'an 710054, China;

    College of Geology Engineering and Geomatics, Chang'an University, No. 126 Yanta Road, Xi'an 710054, China;

    College of Geology Engineering and Geomatics, Chang'an University, No. 126 Yanta Road, Xi'an 710054, China, Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, No. 126 Yanta Road, Xi'an 710054, China;

    Department of Land Surveying and Geo-Informatics, Hong Kong Polytechnic University, Hong Kong, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    multi-interferogram algorithm; interferometric synthetic aperture radar; digital elevation model; terraSAR-X;

    机译：多干涉图算法干涉式合成孔径雷达数字高程模型;terraSAR-X;

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