Conventional and PS Differential SAR Interferometry for Monitoring Vertical Deformation due to Water Pumping: The Haussmann-St-Lazare Case Example (Paris, France)

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/ The St Lazare area in Paris (France) has undergone important water pumping for the construction of the underground Haussmann - St Lazare station for Eole subway line. This paper presents the monitoring of small surface displacements related to the pumping activity by both classical and PS SAR interferometry. Hydrogeolocial and geodetic data are also examined: piezometric measurements provided on 87 piezometers by SNCF and IGC, precise levelling done on 626 points by SNCF. Analysis and comparisons of all available data show first their good agreement and complementarity to monitor the small surface deformation of the studied area and second the potential operationnality of the classical and PS SAR interferometric approach in such study.

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