Retraction: Land subsidence in Beijing from 2017-2018 revealed by Sentinel-1A TOPS time series interferometry (IOP Conf. Ser.: Earth Environ. Sci. 638 012043)

This article has been retracted by the authors, who have admitted a very similar version has already been published [1]. In accordance with the COPE guidelines, IOP Publishing agrees to retract this paper. The authors agree with the retraction and apologise for the mistake. [1] Gou J et al 2019, Revealing Land Subsidence in Beijing by Sentinel-1 Time Series InSAR, The 2019 International Conference on Big Data Analytics for Cyber-Physical System in Smart City, AISC 928, pp. 113-119 Retraction published: 15 June 2021