| RETROSPECTIVE STUDY OF VERTICAL GROUND DEFORMATION IN COMO, NORTHERN ITALY: INTEGRATION OF LEVELLING AND PSI MEASUREMENTS |
| Paper ID : 1060-GEOSPATIAL (R2) |
| Authors: |
|
Rasoul Eskandari *1, Marco Scaioni2 1Department of Architecture, Built Environment and Construction Engineering, Politecnico di Milano, via Ponzio 31, 20133 Milano, Italy 2Department of Architecture, Built Environment and Construction Engineering, Politecnico di Milano via Ponzio 31, 20133 Milano, Italy |
| Abstract: |
| Subsidence-related vertical ground deformation due to natural and anthropogenic factors may lead to considerable damages to structures and infrastructures, and may increase the occurrence probability of consequential events, such as flood, especially on sea and lake shores. Como city, placed in the north of Italy, adjacent to Como Lake, is subjected to significant subsidence phenomenon, which has been monitored by geodetic levelling networks. The drivers of this subsidence have been studied by several researchers. In this work, the historical geodetic levelling measurements and satellite-based Synthetic Aperture Radar (SAR) data archive are integrated to assess the accuracy of Atmospheric Delay and Deformation Rate estimations obtained through Persistent Scatter Interferometry (PSI) technique. The assessment is performed through a statistical comparison between two sets of vertical land deformation rates obtained by integrated methods. Two levelling measurement datasets acquired in 1997 and 2004 are used in order to obtain the precise deformation rate at the benchmarks within the levelling network. For multi-temporal InSAR analysis, 150 SAR images (from 1992 to 2010) and 41 SAR images (from 1992 to 2004) in Ascending orbit from ERS 1 and 2 missions are used in this study. The results of the validation represent a good consistency between deformation rates derived by two techniques. Also, this study will reveal the potential of SAR images acquired in gyro-less mode by ERS-2 mission (2001 - 2010) in terms of the estimation of ground deformation. |
| Keywords: |
| Vertical Ground Deformation, Levelling Measurements, PSInSAR, ERS SAR, Integrated Monitoring |
| Status : Paper Accepted (Oral Presentation) |
