Journal of Geodesy

, Volume 86, Issue 6, pp 375–392 | Cite as

Monitoring ground deformation in Beijing, China with persistent scatterer SAR interferometry

  • Alex Hay-Man Ng
  • Linlin GeEmail author
  • Xiaojing Li
  • Kui Zhang
Original Article


This paper investigated the long term ground deformation in Beijing, China, using persistent/permanent scatterer interferometry (PSI) techniques. GEOS-PSI (Geodesy and Earth Observing Systems-PSI), an in-house software developed at UNSW for PSI, has been applied to 41 ENVISAT ASAR images acquired over the metropolitan area of Beijing City between June 2003 and March 2009 and 24 ALOS PALSAR images (two Paths: 10 acquisitions from January 2007 to October 2008 and 14 acquisitions from February 2007 to September 2009). The results generated using these datasets from the two satellites were cross-validated. Correlations between the results of ENVISAT ASAR and ALOS PALSAR agreed very well. The horizontal and vertical displacement rate maps over Beijing City were obtained from the results generated with data acquired by both satellites over the period from 1st February 2007 to 1st November 2008. The results indicate that the displacements in Beijing City were mainly in the vertical direction. The majority of the easting displacement rates were in the range of −10 mm/year to 10 mm/year, while the vertical rates were in the range of −115 mm/year to 6 mm/year. The possible cause for the ground deformation is groundwater extraction based on our research as well as earlier published studies.


InSAR Urban subsidence Groundwater extraction PSI 


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Alex Hay-Man Ng
    • 1
  • Linlin Ge
    • 1
    Email author
  • Xiaojing Li
    • 1
  • Kui Zhang
    • 1
  1. 1.Geodesy and Earth Observing Systems Group (GEOS), School of Surveying and Spatial Information SystemsThe University of New South WalesSydneyAustralia

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