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利用欧洲空间局ERS-1/2获取的苏州地区1993～2000年SAR数据,通过差分干涉测量处理,得到1993～1995,1995～1998和1998～2000年苏州市地面沉降场测量值.地面水准测量数据的验证分析表明,差分干涉测量值与水准测量值的相关度达0.943,标准误差均值为0.1706,雷达差分干涉测量精度可达5mm(以水准测量代表地面形变的真实情况).文中以7个水准测量基准点为例,分析上述3个时段的地面沉降速率,其总体趋势反映苏州市地面沉降速率趋于减缓,说明近年苏州的地面沉降得到了有效的控制.研究结果表明,SAR差分干涉测量技术进行城市地面沉降方面监测和时空演化特征研究具有很大的优势,同时可用于其他类型城市地质灾害的监测.
Using the SAR data from 1993 to 2000 in Suzhou of the European Space Agency (ERS-1/2), the ground subsidence measurements of Suzhou City from 1993 to 1995, from 1995 to 1998 and from 1998 to 2000 were obtained by differential interferometry. The verification of the data shows that the correlation between differential interferometry and level measurement is 0.943, the standard error is 0.1706, and the accuracy of radar differential interferometry is up to 5mm (the true situation of ground deformation is represented by level measurement) The results show that the ground subsidence in Suzhou has been effectively controlled in recent years.The results show that SAR differential interferometry The technology of urban land subsidence monitoring and the characteristics of space-time evolution has great advantages and can be used for monitoring other types of urban geological disasters.