Monitoring of 3D land subsidence by multi-temporal SAR interferometry with survey data

Abstract

Differential interferometric SAR (DInSAR) technique has been widely known as wide range of land subsidence measurement method. However, the displacement is obtained only along the radar line-of-sight (LOS) direction. Thus, in this paper, we merged the results from PSI and geodetic deformation measurements (GPS and leveling) to estimate the three-dimensinal displacement velocities of Kansai International Airport. We compared the estimated results with GPS/leveling survey data. The root mean squared errors (RMSEs) were 7, 14 and 16 mm/year for the east-west, north-south and vertical components, respectively. It was found our proposed method is effective for land subsidence monitoring.