利用InSAR数据的格尔木市地表沉降监测

InSAR及其相关技术在城市地面沉降监测中具有独特优势。本文采用2015年12月4日至2018年1月10日间的37景Sentinel-1卫星SAR影像数据,基于InSAR时间序列分析技术,对地处高原的格尔木市市区及其周边进行了地表形变监测。结果表明,基于相干性等指标共提取了252 889个相干点,每平方千米平均有501个相干点,后续经相干点分析计算后掩模去误差较大的点后,实际使用相干点252 035个;格尔木市及其周边郊区的整体沉降速率均在5 mm/a以内,未发现明显的沉降区域或大面积的沉降带,市区南部的沉降速率低于北部。

Study on surface settlement of Golmud city based on time series InSAR

InSAR and related technologies have some advantages in urban land settlement monitoring. This paper uses the 37-sentiment Sentinel-1 satellite SAR image data from December 4, 2015 to January 10, 2018, based on InSAR time series analysis technology to monitor the surface deformation of the urban area and its surroundings in Golmud.The results show that 252 889 coherent points are extracted based on coherence and other indicators, with an average of 501 coherent points per square kilometer, after the mask removes the larger error points, 252 035 coherent points are actually used; the overall sedimentation rate of Golmud city and its surrounding suburbs is within 5 mm/a, no obvious subsidence area is found or large-scale settlement belt, the sedimentation rate in the southern part of the urban area is lower than that in the north.