利用Sentinel-1数据和SBAS-InSAR技术监测西安地表沉降

哨兵一号(Sentinel-1)数据是目前现势性较好的免费SAR数据,且因其6天的重访周期,非常适合In SAR地表形变监测。本文以西安市城区及周边为研究区,开展基于多期Sentinel-1数据和短基线集干涉(SBAS-In SAR)技术的时序地表沉降监测方法的探索,研究形成了详细的数据处理流程,利用已有研究资料佐证了方法的有效性。监测表明:2015—2016年,绝大部分区域地表形变速率位于-33~30]mm/a区间内,228 d监测期内累积沉降量最大约75 mm,发生在目前西安最大沉降中心鱼化寨;相比20世纪末,沉降强度大幅减弱,沉降严重区域由西安市东郊向南郊转移,且沉降范围减小。

Monitoring Xi'an Land Subsidence Using Sentinel-1 Images and SBAS-InSAR Technology

Tbe Sentinel-1 data is currently the latest free SAR data and is well suited for land subsidence monitoring based on InSAR technology due to its 6-day revisit cycle.In this paper,Xi'an urban area and its surrounding area are used as the research area,and the time-series surface subsidence monitoring method based on Sentinel-1 data and SBAS-InSAR technique is explored.We obtain a detailed data processing process,which validity is corroborated by using the existing research data.The research shows that most of the regional surface deformation rate is in the range of-33 to 30 mm / a from 2015 to 2016,and the maximum subsidence is about 75 mm in the 228-day monitoring period,occurred in Yu-Hua Zhai that is the largest settlement center of Xi'an.Compared with the late 20th century,the intensity of subsidence decreased greatly,and the serious area of subsidence moved form the eastern suburbs to the southern suburbs of Xi'an,and the range of subsidence reduced.