摘要
根据活动地裂缝造成的形变去相干特征,分析了自适应滤波后的差分干涉图的伪相干图,并从中提取了所监测时间段的活动地裂缝的位置信息,将其与该时间段地面调查的地裂缝位置信息进行了比较。研究发现,采用伪相干图法不仅可以提取活动地裂缝的位置信息,还可以监测地裂缝的发育状况。通过与地裂缝水准对点资料比较发现,活动地裂缝区域可能是造成相位解缠粗差的区域。
Xi＇an ground fissure is a typical geo-hazard with nearly half century and even active up to date. Based on the theory of deformation decorrelation of the active ground fissures, we mainly investigates the positioning method of active ground fissures by analyzing the pseudo-coherence map of adaptively filtered differential interferogram. The manual and automatic methods are also deduced to extract the active fissure information from pseudo-co- herence map. This method is tested by two real ERS SAR data sets, and the feasibilities can he well verified. In conclusion, on the one hand, the pseudo-coherence map can be applied to extract the position of active fissures, and to monitor the temporal evolution of ground fissure on the other hand, it can be used to detect the unwrapping error.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2009年第7期809-813,共5页
Geomatics and Information Science of Wuhan University
基金
国家自然科学基金资助项目(40672173
40802075)
国家自然科学基金重大项目(40534021)
国家国土资源部国土资源大调查项目(1212010440410)
关键词
地裂缝
合成孔径雷达干涉
自适应滤波
伪相干图
ground fissure
SAR interferometry
adaptive filtering
pseudo-coherence map
