Abstract
Abstract. With the rapid development of urban economy, convenient, safe, and efficient urban rail transit has become the preferred method for people to travel. In order to ensure the safety and sustainable development of urban rail transit, the PS-InSAR technology with millimeter deformation measurement accuracy has been widely applied to monitor the deformation of urban rail transit. In this paper, 32 scenes of COSMO-SkyMed descending images and 23 scenes of Envisat ASAR images covering the Shanghai Metro Line 6 acquired from 2008 to 2010 are used to estimate the average deformation rate along line-of-sight (LOS) direction by PS-InSAR method. The experimental results show that there are two main subsidence areas along the Shanghai Metro Line 6, which are located between Wuzhou Avenue Station to Wulian Road Station and West Gaoke Road Station to Gaoqing Road Station. Between Wuzhou Avenue Station and Wulian Road Station, the maximum displacement rate in the vertical direction of COSMO-SkyMed images is −9.92 mm/year, and the maximum displacement rate in the vertical direction of Envisat ASAR images is −8.53 mm/year. From the West Gaoke Road Station to the Gaoqing Road Station, the maximum displacement rate in the vertical direction of COSMO-SkyMed images is −15.53 mm/year, and the maximum displacement rate in the vertical direction of Envisat ASAR images is −17.9 mm/year. The results show that the ground deformation rates obtained by two SAR platforms with different wavelengths, different sensors and different incident angles have good consistence with each other, and also that of spirit leveling.
Highlights
permanent scatterers (PS)-INSAR DATA PROCESSINGIt was found that land subsidence in Shanghai began in 1921 by repeated leveling measurements
The above experimental SAR images are processed based on permanent scatterers (PS)-InSAR technology
According to the coordinates of Shanghai Metro Line 6, the PS points in the range of 50 meters on both sides of the line are screened out
Summary
It was found that land subsidence in Shanghai began in 1921 by repeated leveling measurements. In 2014, Ge et al used COSMO-SkyMed images to study the spatiotemporal variation characteristics of ground subsidence in the construction and operation period of Shanghai Metro Line 10. In 2014, Jia et al processed Envisat ASAR data and obtained displacement information along the Beijing Metro Line 15. In 2016, Qin et al used TerraSAR-X images to carry out subsidence measurements in Shanghai to obtain the overall displacement information of the rail transit network. The atmospheric phase and the nonlinear deformation phase can be separated by high-pass temporal filtering and low-pass spatial filtering so as to get the land subsidence rate. Two sets of SAR data with different wavelength are used to obtain the line-of-sight(LOS) deformation rate along Shanghai Metro Line 6 from 2008 to 2010 by PS-InSAR technology. Comparing the deformation results of the two SAR platforms and the precision leveling data
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