Research on positioning of ground fissures in Xi''an during 1992~1993 based on InSAR interferometry
InSAR技术用于西安地区1992~1993年间活动地裂缝的定位研究

Ground fissure in Xi'an is a typical geo-hazard with nearly half a century history. Based on the theory of deformation de-correlation of the active ground fissures, this paper mainly investigates the positioning of active ground fissures by analyzing the pseudo-coherence map of adaptively filtered differential interferogram. We take two ERS SAR data during 1992-1993 to investigate the active fissures position during this period. And high correlation can be achieved by comparing with the engineering geological investigation results. The leveling data are applied to demonstrate the phase unwrapping errors in the active fissure regions. Therefore special considerations should be taken for discontinuous deformation monitoring in the active fissure region by applying differential InSAR techniques later on.