Abstract
Abstract. In this study, we investigated wide-area land subsidence in Hebei Plain using 78 C-band Sentinel-1A SAR images acquired from May 2017 to May 2018 covering two tracks. High-precision time series retrieval was performed by NSBAS technology based on a single track. The offset deformation values of two tracks calculated in this paper were −0.09 mm/year, and the multi-track deformation rate was successfully merged. Using the cross-validation of redundant observations in the multi-track overlap area to evaluate the accuracy, and it was found that 90% pixel difference between the two track overlap areas was within 9 mm. The standard deviation was 5.38 mm, and the subsidence trend of the overlap area was consistent. Twenty-four subsidence bowls were extracted, and the maximum subsidence rate reached −62 mm/year.
Highlights
The Hebei Plain is the northern part of the North China Plain and is one of the areas with the most severe land subsidence in China (Zhang et al, 2014)
InSAR time series techniques represented by permanent scatters synthetic aperture radar interferometry (PS-InSAR) method (Ferretti et al, 2001; Ferretti et al, 2000) and small baseline subset (SBAS) method (Berardino et al, 2002) have the advantages of high accuracy and wide monitoring range, etc
According to the needs of large-scale ground subsidence monitoring, this paper studied the key technologies of multitrack ground subsidence time series InSAR monitoring
Summary
The Hebei Plain is the northern part of the North China Plain and is one of the areas with the most severe land subsidence in China (Zhang et al, 2014). Land subsidence is prone to cause geological disasters such as Land subsidence and ground fissures, which has a severe impact on the economic development of Hebei Province. Synthetic aperture radar interferometry (InSAR) technology is a new space observation technology developed in recent decades (Bamler et al, 1998; Rosen et al, 2000). InSAR time series techniques represented by permanent scatters synthetic aperture radar interferometry (PS-InSAR) method (Ferretti et al, 2001; Ferretti et al, 2000) and small baseline subset (SBAS) method (Berardino et al, 2002) have the advantages of high accuracy and wide monitoring range, etc. Sentinel1A is a new-generation C-band spaceborne SAR platform It uses terrain observation by progressive scans mode, which improves the imaging width while ensuring image quality (DAI, 2018). Researchers at home and abroad have successfully applied Sentinel-1A data to deformation monitoring in cities and volcanoes, etc
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