Tianjin INSAR time series analysis with L- and X-band

TerraSAR X-band provides high resolution of 1m, short revisit period of 11 days, and sensitive subsidence information, while it cannot afford relatively so high temporal and spatial coherence and wide area coverage as ALOS L-band data. In this work, we exploited the potential of combining Land X-band for subsidence monitoring. A case study was conducted in Tianjin induced by water withdrawal. A total of 9 ALOS images acquired from 2009/4/24 to 2010/10/28 and 37 TerraSAR-X images acquired from 2009/4/29 to 2010/11/11 were used in INSAR time series analysis for retrieving subsidence in the study area. DINSAR analysis based on Minimum Spanning Tree (MST) was applied into L-band to identify potential deformation area and X-band Permanent Scatterers (PS) analysis for this area was carried out for subsidence time series study.