Abstract:To improve the spatio-temporal resolution and accuracy of land deformation monitoring, we adopt the fusion method of CORS network and time series InSAR to study the vertical deformation in Beijing from 2018 to 2020. First, we remove the very shallow surface impact from the InSAR monitoring data. Then, the data of CORS stations are reconstructed in low frequency. Finally, based on CORS network, the InSAR monitoring time series is integral adjusted to obtain the fusion deformation. The results show that the fusion method of CORS network and InSAR monitoring can effectively use the continuous observation advantage of CORS network to obtain continuous and consistent deformation with high spatio-temporal resolution. The fusion method has certain advantages in building high-resolution and high-precision land deformation time series. In the vertical direction, the land subsidence in Chaoyang district, Tongzhou district and mid-southern Daxing district is the most obvious, and the maximum average annual deformation rate reaches -90 mm/a. The mid-western Changping district, western Haidian district and eastern Mentougou district have relatively obvious uplift, and the average annual deformation rate is about 10-20 mm/a. The average annual deformation rate in other regions is about -10-10 mm/a, with relatively small changes and relative stability.
LI Zhijin,ZHANG Chuanyin,WANG Wei et al. Study on Land Subsidence by Combining CORS Network and Time Series InSAR in Beijing Area[J]. jgg, 2023, 43(11): 1123-1128.