利用Sentinel-1A数据监测南京河西地区地面沉降

南京河西地区是受长江和秦淮河淤积演化而成的漫滩地，由于河西新城大规模开发建设和地质条件的影响，地面沉降已成为该区域城市发展中不容忽视的问题。Sentinel-1数据是目前在轨运行的免费SAR数据，其具有较短的重访周期和较大的幅宽，为实现大范围长时序的地表形变监测提供了重要的数据源。利用短基线集干涉（SBAS-InSAR）技术对2015年4月至2018年4月覆盖南京河西地区的19景Sentinel-1A数据进行处理，获取了研究区2015—2018年间的地面沉降结果，并结合城市开发、人口分布等信息深入分析了地面沉降分布特征和成因。

Monitoring the land subsidence in Hexi area of Nanjing by using Sentinel-1A

The Hexi area of Nanjing is a floodplain developed by the deposition of the Yangtze River and the Qinhuai River. Due to the large-scale development and construction of the Hexi New City and the impact of geological conditions, land subsidence has become a problem that cannot be ignored in urban development in the region. Sentinel-1 data is the free SAR data currently running. It has a short revisit cycle and a large width, which provides an important data source for wide-area long-term surface deformation monitoring. The short-baseset set interference (SBAS-InSAR) technique is used to process the 19-story Sentinel-1A data covering the Hexi area from April 2015 to April 2018, and the ground subsidence results of the study area from 2015 to 2018 were obtained and combined. Urban development, population distribution and other information have in-depth analysis of the distribution characteristics and causes of land subsidence.