Research On The Features Of Land Subsidence Through The Sbas-Insar Technique In The Yangling Demonstration Zone Of Free Trade Area

The research area in the south of the Yangling Demonstration Zone is features in a great thickness of the Quaternary loose layer and rich in groundwater resources. In order to find out the land subsidence of the free trade area in Yangling Demonstration area, analyze the deformation characteristics of the land subsidence, and provide basic data for regional engineering construction, urban geological disaster prevention and control, and territorial space planning,the average settlement rate and the cumulative shape variables in the last 5 years were analyzed through the SBAS-InSAR technique on the basis of obtaining the pretreatment data and the data of 76-scene Sentinel-1A data in the area from 2017 to 2022. The result indicates that the surface deformation of the whole area was -84 ～ 40mm with a deformation rate ranging from-18 to 7mm/a. The deformation rate in the most of the area was -5 ～ 5mm/a, showing the development degree of land subsidence was comparative weak, and the whole area was relatively stable.