采用TerraSAR-X数据监测西安地裂缝形变

Monitoring on Xi'an Ground Fissures Deformation with TerraSAR-X Data

基于3m分辨率的TerraSAR-X数据对覆盖西安地区的活动地裂缝进行了定位与监测研究。数据为2009-12-03～2010-03-23共6景Strip模式数据。实验结果显示,高分辨率TerraSAR数据是监测地裂缝很好的数据源,但为了获取高精度的监测成果还需要特别考虑时间和基线去相干因素。二轨法监测结果显示,活动地裂缝往往出现在稳定区域与形变区域的转折部位,而采用人工角反射器技术可以监测出mm量级的地裂缝相对形变信息。

Owing to the fine resolution of TerraSAR-X data provided since 2007,this paper applied 6 TerraSAR data（strip mode） during 3rd Dec.2009 to 23rd Mar.2010 to detect and monitor the active fissures over Xi＇an region.Three themes have been designed for high precision detection and monitoring of Xi＇an-Chang＇an fissures,as small baseline subsets（SBAS） to test the atmospheric effects of differential interferograms pair stepwise,2-pass differential interferogram with very short baseline perpendicular to generate the whole deformation map with 44 days interval,and finally,corner reflector（CR） technique was used to closely monitor the relative deformation time series between two CRs settled crossing two ground fissures.Results showed that TerraSAR data are a good choice for small-scale ground fissures detection and monitoring,while special considerations should be taken for their great temporal and baseline decorrelation.Secondly,ground fissures in Xi＇an were mostly detected at the joint section of stable and deformable regions.Lastly,CR-InSAR had potential ability to monitor relative deformation crossing fissures with millimeter precision.