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

doi:10.13474/j.cnki.11-2246.2020.0013

Abstract

Abstract: 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.

Key words: Sentinel-1, SBAS, InSAR, the Hexi area of Nanjing, land subsidence

CLC Number:

P228

YANG Zhen, XU Jia. Monitoring the land subsidence in Hexi area of Nanjing by using Sentinel-1A[J]. Bulletin of Surveying and Mapping, 2020, 0(1): 61-65,75.

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