Integrating medium and high resolution PSInSAR data to monitor terrain motion along large scale manmade linear features- a case study in Shanghai

We present in this work the monitoring of terrain displacement along large scale manmade linear features in Shanghai city by integrating medium and high resolution PSInSAR data. Focused on the stability of linear features themselves and infrastructures over the path of linear features, land subsidence along Shanghai Magnetic Levitation (Maglev) and No. 10 subway tunnels have been investigated. In the first case we reported the impact of regional subsidence to Maglev line by analyzing PSInSAR measurements from ENVISAT ASAR data and Cosmo 3m resolution data. Subsidence velocity map derived through Cosmo data indicates that the Maglev line has slightly displacement although regional subsidence rate reaches 2-3 cm per year described by ENVISAT data. The second case dedicated on the assessment of subway tunnels to buildings over the path of No. 10 subway. By time series analysis of the Cosmo SAR data acquired during Nov 2008 to June 2010, terrain subsidence in the construction period and operational period of No. 10 line has been studied. The PSInSAR data demonstrated that subsidence caused by subway tunnels reaches l-2cm and it is accelerated after the running of subways since the dynamic loading effect of vehicles.