| At present,China’s urban rail transit(subway)has developed rapidly.It will inevitably have an impact on the surrounding,and even induce the surrounding housing cracking,pipeline breakage,road collapse,etc.in the process of construction and the operation.In order to avoid the harm to people’s life and property,monitoring along the subway lines is significance.However,it is difficult to timely and objectively reflect the trend of deformation of large-scale subway area with conventional measurement methods(leveling measurement,etc.).With the rapid development of synthetic aperture radar interferometry(InSAR),its advantages in the monitoring of subway lines are becoming more and more obvious,such as continuous observation,data source can be rich,low cost and high spatial resolution results.The geographic information system(GIS)has the function of powerful spatial information management and analysis,providing a convenient and effective analysis means to reveal more comprehensive surface and buildings deformation of the spatio-temporal evolution process along the subway lines.In this paper,the PS-InSAR algorithm is used to deal with the 3m resolution data of COSMO-SkyMed stripe mode which covering subway areas in Shenzhen,obtaining the three-dimensional position information,deformation rate information and deformation history information of PS points from September 2013 to August 2016.The PS points in the range of 200 m along the subway are extracted and analyzed statistically,it is found that the subway lines have different degrees of deformation,and the serious sections are mainly concentrated in the coastal and intense human activity areas;line 4 is more stable than any other line,and the line 11 is the opposite.It is found that there is a large deformation in the buffer zone of line 9,which is mainly distributed in strip and mainly near the subway station.With 100 m * 100 m as the window,there are 21 deformation serious areas in the 15 interval sections.BAI SHI SI DAO road surface and YI JING building show the typical decline and uplifting process.In order to further express the deformation information,the Meicun-Xiangmei station interval was selected as the resarch object,and the point,line and surface study were carried out to obtain the deformation characteristics and evolution of the point,line and surface.Some areas were surveyed and found deformation phenomenon in the area. |
