基于改进相干点目标技术的阜阳市地面沉降调查

Study of land subsidence monitoring based on an improved coherent point target technology in Fuyang City

提出了一种改进的相干点目标时序In SAR技术方法。该方法基于子视相干值识别小数据集的相干点目标,采用趋势项滤波方法去除大尺度残差相位,并以阜阳市2012—2013年间10景Radarsat-2 Wide模式数据为例,获得了高空间密度的时序高相干点目标,提高了结果的可靠性,获取的沉降区数据与前人实测资料及野外调查的沉降现象相一致,为开展阜阳市地面沉降风险分析和经常性预警监测提供技术方法和示范应用。

This paper proposed an improved coherent point target In SAR technology. The value of the sub-look coherent was used to identify the coherent point targets of small dataset,and the trend filter was then applied to remove the large-scale residual phase. Using 10 Radarsat-2 Wide Model images over Fuyang City during 2012—2013,the high density coherent point targets were obtained and the reliability of the results were improved. The obtained land subsidence was in accordance with the previous measurement data and our field survey. This method provides the technical supports and application example for risk analysis and the regular monitoring of the land subsidence in Fuyang City.