摘要
利用16期高分辨率RadarSat-2(R2)SAR影像数据,以天津市为主要研究区,获取该城市2020-09至2021-10期间地面沉降速率信息。经初步分析天津市沉降速率超过30 mm/a的区域分布较广泛,超过50 mm/a的辖区包括武清、静海及西青。其中,静海地面沉降整体趋势最为明显。根据收集GNSS监测与水准同期观测数据对获取的InSAR结果利用临近点法匹配同名点进行精度验证分析,由结果可知,23个GNSS监测站统计结果显示,整体偏差的平均误差为6.1 mm,中误差为7.3 mm,正态分布趋势不显著;GNSS与1400余个水准点进行动态平差结果统计分析显示,平均误差为4.73 mm,中误差为6.27 mm,偏差趋近正态分布规范,验证精度优于单GNSS监测结果。本文综合利用InSAR与常规地面沉降观测技术,较好地提取了城市地面沉降相关资料,可为天津精细化控沉管理提供基础数据。
By using 16 scenes of high-resolution RadarSat-2(R2)SAR imagery,the land subsidence rate of Tianjin is obtained during Sep.2020 to Oct.2021.After preliminary analysis,there was more than 30 mm/a subsidence rate in Tianjin,which is widely distributed in the regions including Wuqing,Jinghai and Xiqing district.The most obvious trend of land subsidence occurred in Jinghai district.According to the collected GNSS monitoring and simultaneous observation of leveling data,the obtained InSAR results are matched with the same name points(SNPs)by the approach-point method for accuracy verification and analysis.The results show that:the statistical results of the 23 GNSS monitoring reference stations with the average error of the overall deviation is 6.1 mm,the mean error is 7.3 mm,and the normal distribution trend is not significant;the statistical analysis of dynamic adjustment results with GNSS and more than 1400 leveling points show that the average error is 4.73 mm,the mean square error is 6.27 mm,the deviation approached the normal distribution,and the verification accuracy is better than the single GNSS monitoring results.In this study,InSAR and conventional land subsidence observation technology are comprehensively used to acquire the relevant data of urban land subsidence,which can also provide basic data for the refined-control-subsidence management of Tianjin.
作者
周洪月
周大山
易长荣
常明
ZHOU Hongyue;ZHOU Dashan;YI Changrong;CHANG Ming(Tianjin Institute of Surveying and Mapping Co.,Ltd.,Tianjin 300381,China;Tianjin Geological Affairs Center,Tianjin 300042,China)
出处
《测绘通报》
CSCD
北大核心
2022年第S02期135-139,共5页
Bulletin of Surveying and Mapping
作者简介
周洪月(1990—),男,硕士生,工程师,主要从事InSAR数据处理与天津市地面沉降监测工作。E-mail:ZhouHY0516@126.com
