Land subsidence and transportation routes deformation monitoring in Sanhe City based on joint PS/DS InSAR
Considering the few studies focusing on the road deformation of Sanhe city and lack of plenty of coherent scatterers in Sanhe city,the total of 60 Sentienl-1 images ranging from October 2021 to October 2023 and the multi-temporal InSAR joined DS and PS were used to calculate the surface deformation field of Sanhe city.Then the deformation along two kinds of transportation infrastructure(roads and railways)are extracted.Finally,the ability of C-band SAR data based on the DS/PS to monitor the transportation infrastructure deformation are quantitatively demonstrated.The results are:the spatial pattern of surface subsidence in Sanhe shows a large subsidence funnel combined with several small subsidence funnels.The largest subsidence funnel,presenting a"X"distribution,is located at Yanjiao area with the maximum subsidence velocity of 39 mm/a.Besides that,the subsidence velocity of Yanjiao has a trend of first slow and then increasing.The spatial pattern of deformation along the expressways,first-class roads,second-class roads,third-class roads,other roads,and the railways is uneven,with the deformed road segments mainly located at Yanjiao area.The coherent scatterers density by joining the DS and PS is 5-12 times than that of only using PS.Meanwhile,the percentage of road segments whose coherent scatterers density meet the high coverage level is more than 80％.Therefore,the multi-temporal InSAR joined DS and PS greatly improves the ability of C-band SAR data to monitor the transportation infrastructure deformation.
Sanhe Cityland subsidencetransportation infrastructure deformationInSARC band
万方数据
维普
