MENG R, JIANG Y N, LIAO L,et al.Comparative study of dual-polarized Sentinel-1 data in urban subsidence monitoring[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(4):77-86.

doi:10.16186/j.cnki.1673-9787.2022040048

Received:2022/04/19

Revised:2022/06/10

Published:2024/07/05

Comparative study of dual-polarized Sentinel-1 data in urban subsidence monitoring

MENG Ran, JIANG Yanan1,2, LIAO Lu3, XU Qiang2, LI Weile2, LUO Huiyuan2

1.College of Earth Sciences，Chengdu University of Technology，Chengdu  610059，Sichuan，China;2.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu  610059，Sichuan，China;3.Surveying and Mapping Technology Service Center of Sichuan Bureau of Surveying，Mapping and Geoinformation，Chengdu  610081，Sichuan，China

Abstract:  Objectives To address the problem of the ground subsidence only considering the VV polarization Sentinel-1 data and ignoring the VH polarization data，Methods in this paper，PS-InSAR and SBAS-InSAR techniques were used to process the 84-view dual-polarization Sentinel-1 data in Yan’an New Area from August 2018 to May 2021，obtain the ground settlement information，compare the results of the settlement monitoring of the two polarizations，explore the significance of the VH polarization in different experimental methods，and put forward a new dual-polarized time-series InSAR fusion monitoring method.   Results The results show that most of the new area is relatively stable with deformation rate of -8~8 mm/a；in addition，three larger subsidence areas are detected，located in Qiaoergou Basin，Gaojiagou Basin，and the northeastern filling area of the new area.The monitoring results of Sentinel-1 with different polarization data have high correlation and consistent deformation trends.The overall VV polarization data is better than the VH polarization，but in some areas，the VH polarization data can get more detailed surface deformation.VH polarization data in some areas can get more detailed surface deformation information.In the VV-VH polarization PS-InSAR deformation monitoring，the VH polarization data can effectively supplement the insufficiency of the VV polarization data monitoring results，making the results more intensive，and therefore reflecting a more detailed inversion of surface deformation compared with the results of a single polarization monitoring.The VV-VH polarization SBAS-InSAR deformation rate results have higher coherence and stability compared to a single polarization data. Conclusions The time-series InSAR fusion monitoring technique based on dual-polarized Sentinel-1 data can obtain better urban surface deformation monitoring results than single-polarized data.

Key words:ground subsidence;dual-polarized Sentinel-1 data;time series InSAR;integration monitoring