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SAR Interferometry for Landslide Monitoring in the Emilia-Romagna Region (Italy)

Alessandro Corsini(1) and Paolo Sterzai(2)

(1) Università degli Studi di Modena e Reggio Emilia, Largo S. Eufemia 19, 41100 Modena, Italy
(2) Istituto Nazionale Oceanografia e Geofisica, Borgo Grotta Gigante 42/c, 34010 Sgonico – Trieste, Italy

Abstract

The work concerns the application of SAR interferometry (InSAR) for the monitoring of urban areas affected by slope instability problems. In the framework of an on-going research project, which involves the civil protection authorities of the Regione Emilia-Romagna and several research institutes, SAR interferometry implemented both from satellite platform and ground-based systems has been applied as a tool for landslide risk management. In fact, the use of SAR interferometry, a completely remote sensing technique, allows multitemporal deformation maps of the observed scene to be obtained, with millimetre accuracy in the movement measurement. A set of test sites in the Emilia-Romagna Appennines, characterized by a high landslide risk have been selected in collaboration with the civil protection in order to be interferometrically analysed. This selection has been performed mainly taking into account phenomena characteristics such as deformation rates and vegetation coverage, with respect to the employed techniques. After a preliminary geotechnical characterization of the sites, the interferometric analysis, still in progress, have been implemented. In particular spaceborne Differential SAR Interferometry (DInSAR) has been applied on 10 unstable areas, by interferometrically analysing a set of SAR data acquired in the last 7 years from the European satellites ERS1/ERS2. Moreover, in order to measure terrain displacements induced by landslide characterized by high deformation rates, ground-based SAR interferometry (GBInSAR) has been used for the monitoring of 2 test sites. All the data, both the ancillary one (topographic, geological and geomorphological maps, aerial photos, landslide inventory maps, in situ measurements, etc.) and the interferometric derived measurements have been inserted in a GIS environment enabling data management, evaluation and validation.

 

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Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry