1. Subway Tunnels Identification Through COSMO-SkyMed PSINSAR Analysis in Shanghai Zhiying Wang - HITSZ Daniele Perissin - CUHK Hui Lin - CUHK

2. Subway development in Shanghai 2008 2010 4 new lines and 2 extensions

3. Subway development in Shanghai From 2010 to 2020: 5 extensions , 8 new lines Totally there will be more than 20 lines

5. Previous subsidence studies in Shanghai D. Perissin and T. Wang,Time-Series InSAR Applications Over Urban Areas in China, IEEE J-STARS, 4(1):92 – 100, 2010 (a) PS technique (1993 – 2000) (b) optical leveling (1990-1998) ESA, 40 ERS data images

6. New data availability in Shanghai: Cosmo-SkyMed 33 high resolution/frequency X-band SAR images

8. Processing tool used in this study: SARPROZ http://ihome.cuhk.edu.hk/~b122066/index_files/download.htm Written in Matlab, graphical interface, advanced options, processing, data visual./export.

9. Results and analysis Shanghai Huang Pu, Lu Wan, Jing An and Zha Bei, 600 sqkm ~1.5 Million PS’s

10. Results and analysis Close up of subsidence map and superposition of Metro stations

11. Deformation detail – localization The precise location of the subway tunnels is not public . With radar data, through the surface deformation, we can precisely track the new lines built recently.

13. Example of 3D visualization. The color indicates the PS Height

14. Example of 3D visualization. The color indicates the PS Height

15. Deformation detail – Xiaonanmen Subsidence happens mostly on the ground or on low buildings Near Xiaonanmen station – line 9 High buildings Metro tunnel SARPROZ visualization tool

16. High buildings tunnel SARPROZ visualization tool

17. Deformation detail Amplitude and phase time series

21. Thank you!