ATMOSPHERIC CORRECTIONS IN INTERFEROMETRIC SYNTHETIC APERTURE RADAR SURFACE DEFORMATION – A CASE STUDY OF TAIYUAN CITY, CHINA

摘要

The main systematic error on the accuracy of InSAR is thernatmospheric phase screen (APS). The delay is typicallyrndecomposed into a stratified component and turbulentrncomponents. We proposed a atmosphere-corrected PSIrnmethod that the stratified delay was corrected by using ERAInterimrnreanalysis. We applied the proposed method tornENVISAT ASAR images covering Taiyuan basin, China, tornstudy the ground deformation associated with groundwaterrnextraction. Experimental results show that the proposedrnmethod significantly mitigate the topography-correlatedrndelay and the estimated ground displacements agree morernclosely with GPS measurements than the conventional PSI.