多基线InSAR技术的震区DEM提取及精度分析  

DEM Extraction and Accuracy Analysis of Earthquake Area Based on Multi-Baseline InSAR

作　　者：刘忠 黄长军 曹元志 LIU Zhong;HUANG Changjun;CAO Yuanzhi(Hunan Remote Sensing Geological Survey and Monitoring Institute,Changsha Hu’nan 41000,China;School of Municipal and Surveying Engineering,Hunan City University,Yiyang Hu’nan 413000,China)

机构地区：[1]湖南省遥感地质调查监测所,湖南长沙410000 [2]湖南城市学院市政与测绘工程学院,湖南益阳413000

出　　处：《传感技术学报》2023年第7期1108-1115,共8页Chinese Journal of Sensors and Actuators

基　　金：湖南自然科学基金项目(2021JJ30076);湖南省教育厅科技计划重点项目(21A0502)。

摘　　要：针对汶川特大地震发生后的震区地形严重破坏,原有的地形图及DEM数据不再具有时效性,不能准确地描述地质特征,亟待更新重建。收集了2007年8月至2010年7月的20景Envisat ASAR影像数据,采用多基线InSAR技术对研究区域DEM进行提取,并对生成的ASAR DEM与ASTER GDEM和SRTM DEM进行了比较分析。实验结果表明,由于时效性原因,ASTER GDEM和SRTM DEM不能较好反映震后地面高程变化情况;所提取的ASAR DEM能有效弥补震后灾区DEM不足,在一些植被较少和地质稳定区域,ASAR DEM有着较高的精度,多基线InSAR技术提取方法为震后形变区域DEM提取提供了一个很好的途径。For the serious destruction of the terrain in the earthquake area after the Wenchuan earthquake,the original topographic map and DEM data are no longer time-effective,which can not accurately describe the geological characteristics,and need to be updated and reconstructed urgently.20 Envisat ASAR images from August 2007 to July 2010 ARE collected,the DEM in the study area is extracted by using multi-baseline InSAR technology,and the generated ASAR DEM is compared with ASTER GDEM and SRTM DEM.The exper-imental results show that ASTER GDEM and SRTM DEM cannot accurately reflect the ground elevation changes due to timeliness,and it is easy to introduce topographic errors.In some areas with less vegetation and stable geology,ASAR DEM has high measurement accu-racy.Multi-baseline InSAR technique can be used as an effective method for DEM reconstruction in post-earthquake deformation areas.

关 键 词：多基线INSAR 震区 DEM ENVISAT ASAR 

分 类 号：TN959[电子电信—信号与信息处理]