Monitoring land subsidence through improved CAESAR algorithm in time-series InSAR processing
Time-series SAR interferometry (InSAR) combining permanent scatterer and distributed scatterer (DS), has been strongly developed in subsidence monitoring. It is known that the Component extrAction and sElection SAR (CAESAR) is a recently presented approach of selecting and filtering scattering mecha...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2024-01-01
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| Series: | Geocarto International |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/10106049.2024.2364689 |
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| _version_ | 1850163835450687488 |
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| author | Qian He Huan He Kangming Song Jiawei Chen |
| author_facet | Qian He Huan He Kangming Song Jiawei Chen |
| author_sort | Qian He |
| collection | DOAJ |
| description | Time-series SAR interferometry (InSAR) combining permanent scatterer and distributed scatterer (DS), has been strongly developed in subsidence monitoring. It is known that the Component extrAction and sElection SAR (CAESAR) is a recently presented approach of selecting and filtering scattering mechanisms for DS. This article proposes an improved CAESAR algorithm in InSAR processing. Phase optimization is performed by eigenvalue decomposition and principal component analysis of the coherence matrix that constructed based on the identified homogeneous pixels. In addition, only the interferometric phases with low noise are used to calculate the goodness-of-fit value. The improved method has been tested for subsidence monitoring over a nonurban area located in Xiongxian, China using 25 Sentinel-1A images. The results show that the improved method can provide the high spatial density of deformation measurements with accuracy ensured. Noticeable land subsidence is revealed widely within the north of Xiongxian county, particularly in Daying, Mijiawun and Beishakou towns. |
| format | Article |
| id | doaj-art-4ac115eccb5047c3a625dc9a2bf94b09 |
| institution | OA Journals |
| issn | 1010-6049 1752-0762 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Geocarto International |
| spelling | doaj-art-4ac115eccb5047c3a625dc9a2bf94b092025-08-20T02:22:09ZengTaylor & Francis GroupGeocarto International1010-60491752-07622024-01-0139110.1080/10106049.2024.2364689Monitoring land subsidence through improved CAESAR algorithm in time-series InSAR processingQian He0Huan He1Kangming Song2Jiawei Chen3Hubei Land Resources Vocational College, Wuhan, ChinaTianma construction Group Ltd., Wuhan, ChinaGuangzhou Urban Planning and Design Survey Research Institute, Guangzhou, ChinaGanzhou Liangye Technology Co., Ltd., Ganzhou, ChinaTime-series SAR interferometry (InSAR) combining permanent scatterer and distributed scatterer (DS), has been strongly developed in subsidence monitoring. It is known that the Component extrAction and sElection SAR (CAESAR) is a recently presented approach of selecting and filtering scattering mechanisms for DS. This article proposes an improved CAESAR algorithm in InSAR processing. Phase optimization is performed by eigenvalue decomposition and principal component analysis of the coherence matrix that constructed based on the identified homogeneous pixels. In addition, only the interferometric phases with low noise are used to calculate the goodness-of-fit value. The improved method has been tested for subsidence monitoring over a nonurban area located in Xiongxian, China using 25 Sentinel-1A images. The results show that the improved method can provide the high spatial density of deformation measurements with accuracy ensured. Noticeable land subsidence is revealed widely within the north of Xiongxian county, particularly in Daying, Mijiawun and Beishakou towns.https://www.tandfonline.com/doi/10.1080/10106049.2024.2364689Eigenvalue decompositionprincipal component analysisdistributed scattererpermanent scatterer |
| spellingShingle | Qian He Huan He Kangming Song Jiawei Chen Monitoring land subsidence through improved CAESAR algorithm in time-series InSAR processing Geocarto International Eigenvalue decomposition principal component analysis distributed scatterer permanent scatterer |
| title | Monitoring land subsidence through improved CAESAR algorithm in time-series InSAR processing |
| title_full | Monitoring land subsidence through improved CAESAR algorithm in time-series InSAR processing |
| title_fullStr | Monitoring land subsidence through improved CAESAR algorithm in time-series InSAR processing |
| title_full_unstemmed | Monitoring land subsidence through improved CAESAR algorithm in time-series InSAR processing |
| title_short | Monitoring land subsidence through improved CAESAR algorithm in time-series InSAR processing |
| title_sort | monitoring land subsidence through improved caesar algorithm in time series insar processing |
| topic | Eigenvalue decomposition principal component analysis distributed scatterer permanent scatterer |
| url | https://www.tandfonline.com/doi/10.1080/10106049.2024.2364689 |
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