Abstract
Abstract. The Sentinel-1 data is currently the latest free SAR data and is well suited for land subsidence monitoring based on InSAR technology due to its 6-day revisit cycle. In this paper, the urban area and surrounding areas of Handan City are used as research areas, and 29 scences of S1A data (December 2017 – December 2018) was used for time series SBAS processing. The results shows that the surface cumulative deformation ranged from -42 to 30 mm in most regions of Handan City. The maximum settlement is 69 mm, which is near the Hankuang Group Julong Company. The areas where the settlement is obvious include Wu'an City, Daishan Village, Dashe Town, Zhangxibao Town, Baijia Street, Dongxingtai Village, Gaonan Village and Hankuang Group Julong Company. Slightly elevated in the southeast of Handan City.
Highlights
With the development of society, economic prosperity, largescale construction of transportation facilities and houses, continuous exploitation of mineral resources and overexploitation of groundwater caused environmental degradation
Geological disasters occur in many types, large quantities, and great hazards, which have a major impact on surrounding buildings and personal safety, and the damage caused to the environment is difficult to recover(Zhou, 2017a)
Small baseline subset (SBAS)-Interferometric synthetic aperture radar (InSAR) technology overcomes the shortcomings of persistent scatterer (PS)-InSAR technology because of the poor coherence of some interferograms caused by selecting a pair of images as common main images, and reduces the demand for SAR data, and the computational efficiency is high(Zhou,.2017a)
Summary
With the development of society, economic prosperity, largescale construction of transportation facilities and houses, continuous exploitation of mineral resources and overexploitation of groundwater caused environmental degradation. Land subsidence is one of the major geological disasters in Handan City It has a large amount of settlement and a wide range of spreads, and induces geological disasters such as landslides, ground fissures and ground subsidence. Compared with traditional ground subsidence monitoring methods, it has the advantages of high monitoring accuracy (up to millimeter level), wide coverage, high operating efficiency, low cost, and streamlined data processing(Hanssen, 2001). It has become one of the hotspots of research in the world. A large number of scholars have verified that SBAS-InSAR technology has high monitoring accuracy in urban settlement monitoring, up to millimeter level (Wang, 2015a; Xie, 2015a). Monitoring and analyzing the development law and spatial distribution characteristics of land subsidence in Handan City, providing the government with the basis for control and governance
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