Exploring Temporal-Spatial Characteristics of Shanghai Road Networks Settlement with Multi-temporal PSInSAR Technique

The continuous monitoring of the stability of urban road networks is not only of utmost significance to mitigate the financial and human losses, but also beneficial to the sustainable development of economy and society. For the long-distance and long-span real time monitoring requirements, this article introduced PSInSAR (persistent scatterer synthetic aperture radar interferometry) technology to the deformation monitoring and warning of urban road networks. We processed 26 time series TerraSAR-X images in Shanghai and focused on the temporal-spatial analysis of the subsidence along the road networks. In the space, the overall land subsiding characteristics of road network was first demonstrated, and then the detailed subsidence detail and the subsidence driving force of the typical road. In the temporal time, we discussed the temperature variation associated with temporal displacements of asphalt pavement and verified the accuracy of the results. The results show the settlement of Shanghai road network is mainly distributed in Pudong district, which is associated with the density of roads. The rapid urbanization construction has become a main cause of urban road network subsidence. The temporal deformation shows some time correlation with the temperature variation. The verify results showing fairly consistent agreement.