Sentinel-1 InSAR Measurements of Land Subsidence over Henan Province, China from 2018 To 2020

Henan Province is one of the main grain producing areas in China and an important transportation hub. The land subsidence will cause some damage to agriculture and infrastructure. Sentinel-1 data is widely used in subsidence monitoring because of its wide coverage and free access. In this study, parallel computing-based coherent scatterer interferometric synthetic aperture radar (P-CSInSAR) method was used to process the 625 scenes sentinel-1 data of 10 frames in four orbit tracks within Henan Province area, and the line-of-sight (LOS) deformation map from August 2018 to December 2020 was obtained. The subsidence in Henan Province is mainly concentrated in the northeast, which is mainly caused by groundwater extraction and underground mineral resources mining. The normal monitoring and policy intervention of land subsidence in Henan Province will play an important role in the sustainable development of urban economy.