Near real-time deformation monitoring based on Persistent Scatterer Interferometry

September 19, 2011 in

Conference Paper


Author
Ling Chang

Co-authors
Ramon Hanssen

Theme(s)


Conference
ESA Fringe 2011 Workshop
Year: September 2011
Location: Frascati, Italy

Keywords
Near Real-time deformation monitoring, TerraSAR-X

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Abstract

In this paper, we present a complete procedure for Near Real-time (NRT) deformation monitoring by Persistent Scatterer Interferometry (PSI). Frequent-update short- time interferograms are used. Persistent scatterers are long-term stable, but not necessarily over the full time series. In this study, the key focus is to identify and characterize all available points and to track their deformation time series. Moreover, a robust testing approach is performed to discriminate between reliable deformation of points and errors induced by noise. To evaluate the algorithm, we carry out a case study over Delft, the Netherlands. Sixty descending TerraSAR-X images acquired between April 2009 and April 2011 are studied. From this experiment, the feasibility of NRT deformation monitoring can be demonstrated, as well as the reliability of the deformation time series for all tracked points. Meanwhile, it provides an alarm when the deformation behavior is anomalous, to enable mitigating actions.