双极化Sentinel-1数据在昆明市沉降监测中的应用

针对多数学者用VV极化的Sentinel-1数据对城市区域进行监测而忽略VH极化数据的问题,本文利用SBAS-InSAR方法,结合28景双极化(VV极化和VH极化)Sentinel-1数据,得到了昆明市2018年8月—2019年7月间的地面沉降情况,并且对两种极化的沉降监测结果进行对比.结果表明昆明市主城区存在着较为明显的沉降现象,部分区域沉降严重形成明显的沉降漏斗.最大年平均沉降速率达到-53.63 mm/a(VV极化)和-53.67 mm/a (VH极化).对两种极化的数据集进行对比,发现在SDFP点的筛选和获取方面,VV极化数据集要优于VH极化数据集;其次,VV极化数据和VH极化数据的沉降速率、沉降分布及趋势等结果呈现出一致性,但是二者在同一时间段的各个监测节点的沉降时序变化存在着差异.

Application of dual-polarized Sentinel-1 data to subsidence monitoring in Kunming

Aiming at the problem that most scholars use VV-polarized Sentinel-1 data to monitor urban areas and ignore VH-polarized data,this paper uses the SBAS-InSAR method,combined with 28 scenes of dual-polarized(VV-polarized and VH-polarized)Sentinel-1 Data,obtained the ground subsidence in Kunming from August 2018 to July 2019,and compared the results of the two polarized settlement monitoring.The results show that there is a relatively obvious settlement phenomenon in the main urban area of Kunming,and the settlement in some areas is seriously forming an obvious settlement funnel.The maximum annual average settlement rate reaches-53.63 mm/a(VV polarization)and-53.67 mm/a(VH polarization).Comparing the two polarization data sets,it is found that in the selection and acquisition of SDFP points,the VV polarization data set is better than the VH polarization data set;second,the sedimentation rate of the VV polarization data and the VH polarization data,The results of settlement distribution and trend are consistent,but there is a difference in the change of settlement timing of each monitoring node in the same time period.