基于InSAR技术的中国地表形变一张图研制

Development of National Ground Deformation Rate Map of China Based on InSAR Technology

地表形变危害巨大且深远,利用合成孔径雷达干涉测量(interferometric synthetic aperture radar,InSAR)技术监测地表形变虽已较为成熟,但是超大范围,甚至全国范围的地表形变快速提取仍充满挑战。为快速获取全国地表形变信息,设计了一种基于超算并行计算的广域地表形变快速提取优化方法,并对干涉集基线组合方法、广域相位解缠算法、大气效应改正方法等进行了改进和创新。基于该方法,采用10157景哨兵1号数据,研制了中国全境2021年度40m分辨率地表形变速率图,经验证形变速率精度为4.82mm/a,有效覆盖度为94.6%,图幅间无明显接边差异。同时对国内典型地表形变区域进行了分析。研究为广域地表形变常态化快速提取提供了参考。

The damage of ground deformation is huge and farreaching.Although it is relatively mature to monitor ground deformation via interferometric synthetic aperture radar(In-SAR),challenges still exist in the fast extraction of large-scale ground deformation,i.e.,across the country.To quickly obtain the national ground deformation information,we design an optimized method for fast extraction of large-scale ground deformation based on supercomputing parallel comput-ing,improve and innovate the baseline combination method of interferometric pairs,large-scale phase unwrapping algo-rithm,atmospheric effect correction method,etc.Based on this method,we use 10157 scenes of Sentinel-1 data to develop a 40-meter resolution national ground deformation rate map for the whole territory of China in 2021.The accuracy of the deformation rate is 4.82 mm/a,the effective deformation information coverage is 94.6%,and there is no obvious edge difference between the scenes.At the same time,the typical ground deformation areas in China are analyzed.This research provides a reference for the routinely fast extraction of large-scale ground deformation.