基于不同DEM的D-InSAR地表形变监测

Surface deformation monitoring of D-InSAR deformation based on different DEM

为了促进合成孔径雷达差分干涉测量(D-InSAR)技术在地表沉降监测中的应用,基于D-InSAR技术,以河南省郑州市部分区域为例,基于二轨法采用2019年3月-12月的哨兵1号数据,针对外部不同分辨率的DEM,对郑州市东、西、南、北、中部分区域以及郑州火车站、郑州东站和郑煤集团东坪煤矿周围等部分特殊区域的地表形变情况进行监测。实验结果表明:郑州北部和郑州西南区域的形变量相对较大,其中郑州西南区域平均有约57.929 mm的沉降量,郑州北部区域平均有140.124 mm的抬升量;同时在不同分辨率对D-InSAR监测结果的影响中发现,ASTER-GDEM和GDEMDEM可靠性比较高,GDEMDEM更适合作为外部参考DEM。

In order to promote differential synthetic aperture radar interferometry(D-InSAR)technology in the application of the surface subsidence monitoring,in this paper,based on D-InSAR technique,with parts of zhengzhou in henan province as an example,based on the second track method adopted in March 2019-December sentry data,1 for external different resolution DEM,the zhengzhou city east,west,south,north,middle parts and zhengzhou railway station,zhengzhou east station and zheng meijituan proposed around the surface of some special areas such as coal mine to monitor deformation condition.The experimental results show that the shape variables in the northern part of Zhengzhou and the southwestern part of Zhengzhou are relatively large.The subsidence amount in the southwestern part of Zhengzhou is about 57.929 mm on average,and the uplift amount in the northern part of Zhengzhou is 140.124 mm on average.Meanwhile,in the influence of different resolutions on D-InSAR monitoring results,it is found that ASTER-GDEM and GDEMDEM have relatively high reliability,and GDEMDEM is more suitable to be used as external reference DEM.