Application of optical satellite-assisted SBAS-InSAR technology in large-scale surface deformation monitoring
The destruction of natural landform by engineering construction is prone to geological disasters,which can be effectively predicted by surface deformation monitoring using the multi-temporal interferometric synthetic aperture radar(InSAR)technology.However,traditional InSAR only extract three-dimensional deformation information and cannot analyze geological conditions related to deformation triggers such as soil hydrology,vegetation cover.Therefore,surface deformation analysis and disaster identification were conducted near the third oil pipeline in Changqing Oilfield,by taking multispectral data from optical remote sensing satellite GF-2 to assist multi-temporal Sentinel-1A radar satellite ascending orbit imagery as the data source,and using small baselines subset InSAR(SBAS-InSAR)technology based on corner reflectors.The proposed method predicates 41 potential geological hazard hidden points,with a disaster coverage rate of 100％,an overall accuracy of 92.86％and monitoring accuracy better than 1 cm,verifying the effectiveness of the proposed method.
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