1.昆明理工大学国土资源工程学院,云南 昆明,650093
2.云南省自然资源智能监测与时空大数据治理重点实验,云南 昆明,650051
3.湖南科技大学煤炭资源结利用与矿山环境保护湖南省重点实验室,湖南 湘潭,411201
4.云南省地质环境监测院,云南 昆明,650216
李勇发,博士,讲师,主要从事InSAR数据处理与技术理论等方面的研究。yfli@kust.edu.cn
左小清,博士,教授。zxq@kust.edu.cn
收稿:2024-08-13,
纸质出版:2025-12-05
移动端阅览
李勇发,左小清,朱大明,等.基于张量分解的广域长时序InSAR影像压缩及地表形变监测[J].武汉大学学报(信息科学版),2025,50(12):2472-2484.
LI Yongfa,ZUO Xiaoqing,ZHU Daming,et al.Tensor Decomposition-Based Compression of Wide-Area Long Time Series InSAR Images and Application to Surface Deformation Monitoring[J].Geomatics and Information Science of Wuhan University,2025,50(12):2472-2484.
李勇发,左小清,朱大明,等.基于张量分解的广域长时序InSAR影像压缩及地表形变监测[J].武汉大学学报(信息科学版),2025,50(12):2472-2484. DOI:10.13203/j.whugis20230164
LI Yongfa,ZUO Xiaoqing,ZHU Daming,et al.Tensor Decomposition-Based Compression of Wide-Area Long Time Series InSAR Images and Application to Surface Deformation Monitoring[J].Geomatics and Information Science of Wuhan University,2025,50(12):2472-2484. DOI:10.13203/j.whugis20230164
随着合成孔径雷达(synthetic aperture radar,SAR)影像的持续积累,合成孔径雷达干涉测量(interferometric synthetic aperture radar,InSAR)技术在处理广域长时序地表形变监测任务时,面临数量激增带来的计算瓶颈。尤其是采用分布式散射体InSAR(distributed scatterers InSAR,DS-InSAR)方法时,干涉对的全组合策略导致解算过程极为耗时,限制了其在大区域形变监测中的广泛应用。由于时序InSAR数据在时空维度上通常包含大量冗余信息,影像压缩成为去除冗余信息的有效解决手段。因此提出一种基于张量分解的广域长时序InSAR影像压缩方法,利用空间内像素统计特性的一致性将协方差矩阵重构为三阶张量,并借助Tucker分解实现时空维数据压缩。为验证其有效性,选取昆明市主城区Sentinel-1A影像进行实验。结果显示,在2×3和2×5的子空间窗口设置下,处理效率分别提高约24倍与40倍,且形变反演精度仍符合监测要求;当子空间窗口为2×10和2×15时,尽管部分信息丢失,主要形变区域依然可辨识,此时效率提升分别达约80倍与120倍。为应对广域长时序InSAR形变监测中的计算难题提供了一种新的途径,具有较好的工程应用前景。
Objectives
2
With the continuous accumulation of synthetic aperture radar (SAR) images
interferometric synthetic aperture radar (InSAR) technology is facing a computational bottleneck caused by the surge in the number of SAR images when processing wide area and long-term surface deformation monitoring tasks. Especially for the distributed scatterers InSAR (DS InSAR) method
the full combination strategy of interferometric pairs results in an extremely time-consuming solution process
limiting its widespread application in large-scale deformation monitoring. However
temporal InSAR data often contains a large amount of redundant information in the spatiotemporal dimension. Removing redundant information through image compression has become an effective solution.
Methods
2
This paper proposes a tensor decomposition⁃based method for wide area long time series InSAR image compression. The proposed method utilizes the consistency of spatial pixel statistical properties to reconstruct the covariance matrix into a third-order tensor
and uses Tucker decomposition to achieve spatiotemporal data compression.
Results
2
To verify its effectiveness
Sentinel-1A images from the main urban area of Kunming city are selected for the experiment. The results show that under the compression subspace settings of 2×3 and 2×5
the processing efficiency is improved by about 24 times and 40 times
respectively
and the deformation inversion accuracy still meets the monitoring requirement. When the subspace is expanded to 2×10 and 2×15
although some information is lost
the main deformation area can still be identified
and the efficiency is improved by about 80 times and 120 times
respectively.
Conclusions
2
This paper provides a new approach to address the computational challenges in wide area long-term InSAR deformation monitoring
and has good engineering application prospects.
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