Abstract: The occurrence and development of land subsidence are closely related to human social and economic activities. With the continuous development of coastal areas, land subsidence centers have shifted from inland to port, seawall and reclamation areas, and the influencing factors have also changed from single to mixed types. The regional full coverage characteristics of InSAR monitoring can meet the changing monitoring requirements. Taking Lianyungang Area as an example, , this paper conducts multi-source data comparison and verification of land subsidence, to verify and evaluate the InSAR monitoring results. The results show good consistency and high credibility, and meet the current requirements for land subsidence monitoring accuracy. The study provides data support for the optimization and improvement of urban land subsidence monitoring technology system. 

Key words: InSAR, land subsidence, data fusion, leveling