Potential of TerraSAR-X Interferometry for Monitoring Ground Deformation Due to Civil Infrastructure Construction

The TerraSAR-X SAR system provides high spatial resolution and geometric accuracy imagery which supports well the mapping of the 3-D structure of the city and its motions (4-D). In this work, we have evaluated potential of the very high resolution (VHR) satellite observations for monitoring and detecting ground deformation due to largescale civil infrastructure constructions. Two case studies were carried out in test sits of the Shenzhen Metro Line 4 and the Lantau Link Hong Kong, which are characterized by different triggering mechanisms of land subsidence: one induced by subway tunnelling constructions and the other by land reclamation from the sea. A total of 15 TerraSAR-X scenes phase ramp correction and multi-master stacking analysis. The preliminary results indicate a remarkably high density of PS points (>2,500 PS point/km with the good long-term coherence of man-made features (e.g. roads and buildings), make TerraSAR-X interferometry constructions.