VERIFICATION OF AREAL GROUND DEFORMATION MONITORING IN URBAN AREAS USING X-BAND IMAGES

Abstract

 Land subsidence, which used to be a serious social problem, is now under control due to groundwater pumping regulations enacted in the 1960s. However, as a result, the recovery of the groundwater level has been promoted, and the new problem of ground uplift has been occurring mainly in urban areas. However, the risk of ground uplift disasters is a concern. In this study, we apply PSInSAR, a type of time-series SAR analysis, to X-band imagery, which is well suited for analysis in urban areas, to monitor areal ground deformation. As a result of the analysis, the RMSE is 1.6 mm/year compared to the level survey data, indicating that the spatial interpolation of the level survey data is possible. Furthermore, a strong correlation (r = 0.80) was found between the amount of groundwater level rise and the amount of ground uplift.