Abstract: In this paper, the spatio-temporal variation characteristics of land subsidence in urban reclamation areas are analyzed by using different means and different scale ground monitoring methods. Through the analysis of the land subsidence monitoring project in Shenzhen Dakonggang District, combined with precise leveling and remote sensing monitoring methods, the land subsidence monitoring at different scales is realized, and the spatio-temporal variation characteristics of land subsidence in this area are obtained. The research results show that both precision leveling method and remote sensing monitoring method have found that the settlement caused by the roads around the Convention and Exhibition Center has the same change characteristics. The precise leveling monitoring method can accurately obtain the local ground settlement, and the maximum ground settlement around the building foundation pit of Shiwei road is -303.6mm. Combined with different means and different scale monitoring methods, the deformation characteristics of the monitoring object can be obtained comprehensively.

Key words: leveling monitoring, SBAS, InSAR, land subsidence, temporal and spatial variation