GB-InSAR-Based DEM Generation Method and Precision Analysis

GB-InSAR-Based DEM Generation Method and Precision Analysis
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基于GB-InSAR的DEM生成方法及精度分析

DOI:
10.3390/rs11090997
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发表时间:
2019-04
期刊:
影响因子:
5
通讯作者:
Zeng Tao
Zeng Tao
中科院分区:
工程技术2区
文献类型:
--
作者:
Tian Weiming;Zhao Zheng;Hu Cheng;Wang Jingyang;Zeng Tao

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地基干涉测量技术具有观测间隔短、作业环境灵活、数据精度高等特点,在地形测绘领域发挥着重要作用。地基干涉合成孔径雷达(GB-InSAR)具有宽波束、与斜距相当的景象宽度和大的下视角度。观测场景往往表现出不同坡度和坡度方向的斜坡地形类型。这些特殊性导致典型地形生成方法失效,使用典型值产生的分析结果精度较差。本文首先提出了一种基于地理定位概念的三维坐标生成方法。然后,报告了误差源及其传播的模型和分析。详细讨论了相关系数的计算方法,给出了考虑视景空间分布信息的系统误差分布图。结果可以适应不同的观看场景,并涵盖整个区域的性能,这将有助于基线优化。将GB-InSAR生成的数字高程图(DEM)与激光雷达(LiDAR)生成的数字高程图进行了比较。理论与实际的误差大小和分布相似性证明了所提出的DEM生成方法、相关系数估计公式和系统精度分析方法的正确性和有效性。
Ground-based interferometric technology plays an important role in the terrain mapping sphere because it is characterized by short observation intervals, a flexible operation environment, and high data precision. Ground-based interferometric synthetic aperture radar (GB-InSAR) has a wide beam, a scene breadth comparative to the slant range, and a large downwards-looking angle. The observation scenes always show the type of slope terrain with various gradients and slope orientations. These particularities cause the invalidation of the typical terrain generation method and produce poor precision analysis results using typical values. This paper first proposes a three-dimensional-coordinate generation method based on the geolocation concept. Then, the models and analyses of the error sources and their propagations are reported. The method of calculating the correlation coefficient is meticulously discussed, and a system error distribution diagram is presented that considers the spatial distribution information of the viewing scene. The result can be adapted to different viewing scenes and encompasses the performance of the whole area, and it will help with baseline optimization. The digital elevation map (DEM) generated by GB-InSAR is compared with one produced by light detection and ranging (LiDAR). The error magnitude and the similarity of the distribution between theory and reality prove the correctness and effectiveness of the presented DEM generation method, the correlation coefficient estimation formula, and the system precision analysis method.
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