摘要
随着DEM获取途径的多样化,地形相位分量初始化精度对地面沉降信息提取的影响程度和原因需要深入探讨.本文以广东珠三角洲广州与佛山交界区域为实验区,借助两种常用外部DEM(SRTM、ASTER GDEM),利用相干点目标法(IPTA)进行地面沉降提取试验,探索哪一种更适合作为InSAR外部参考的DEM.试验中分别从两种DEM与干涉图的配准精度、DEM自身精度、沉降结果的统计量以及解缠相位、PS点质量分析等方面进行误差分析.研究结果表明,在IPTA实验中,SRTM比ASTER GDEM具有更好的应用效果,更适合做外部参考DEM.
With the diversification of DEM access,the influences of DEM precision on the result of ground subsidence need to be discussed.In this paper,basing on two common external reference DEMs（SRTM and ASTER GDEM）,the ground subsidence experiment of Pearl River Delta is carried out using IPTA method.The error is analyzed separately from the registration accuracy between DEMs and interferogram figure,the precision of DEMs,the ground subsidence results,unwrapping phase and the quality of PS points.The results show that in the IPTA experiment,the SRTM is better than ASTER GDEM in application,and it is more suitable to be the external DEM.
出处
《杭州师范大学学报（自然科学版）》
CAS
2016年第2期208-213,共6页
Journal of Hangzhou Normal University(Natural Science Edition)
基金
杭州市社会发展科研专项(20130533B12)
