Monitoring Displacement on National Route and Railway with PALSAR-1 Data by using Multi-Temporal Displacement Decomposition in Chiba Prefecture, Japan

The purpose of this study is to monitor the surface displacement on the large scale of the infrastructures such as highways and railways with the interferometric stacking technology (SBAS). Both ascending and descending acquisitions are used to decompose the multi-temporal displacement into east-west and vertical components. The RMSE value between the resulting vertical displacement and the vertical measurement of the permanent GPS station located in the study area was 5.1 mm. Also the obtained displacement shows the subsidence phenomena on National Route 464 due to the extended constructions along the route and railway.