Application of SBAS-InSAR in monitoring ground subsidence in karst areas:a case from Jiangzhou District of Chongzuo
The 25 scenes of Sentinel-1A data taken in 2020 were processed by SBAS-InSAR,and the land sub-sidence information in Jiangzhou District of Chongzuo is obtained.The causes of deformation are compared and analyzed by high-resolution remote sensing images from the same period of time.The results show that in terms of deformation rate,the maximum deformation rate in a small area of Jiangzhou District is-40.96 mm/a,the maximum deformation rate in central area is-30.00 mm/a and presents a large-scale and continuous deforma-tion,and the maximum deformation rate in northern part of the city is 10.00 mm/a and has a rising trend in some areas.Compared with measurements of CORS,the maximum difference between inversion results of SBAS-InSAR and settlement amount of CORS station is 2 mm,and the minimum difference is-3 mm.The results ob-tained by the two methods are basically consistent,which verifies the feasibility of SBAS-InSAR for ground set-tlement in karst areas and can effectively monitor ground settlement.
国家科技期刊平台
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