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Remote Sens. 2017, 9(7), 739; https://doi.org/10.3390/rs9070739

Multi-Temporal X-Band Radar Interferometry Using Corner Reflectors: Application and Validation at the Corvara Landslide (Dolomites, Italy)

1
Institute for Earth Observation, Eurac Research, Bolzano-Bozen 39100, Italy
2
Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Modena 41121, Italy
3
Geodesy and Geomatics Division, Department of Civil, Constructional and Environmental Engineering, University of Rome “La Sapienza”, Roma 00184, Italy
4
Office for Geological Surveys and Building Material Test, Autonomous Province of Bolzano, Cardano-Kardaun 39053, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Zhong Lu, Chaoying Zhao and Richard Gloaguen
Received: 15 May 2017 / Revised: 5 July 2017 / Accepted: 12 July 2017 / Published: 18 July 2017
(This article belongs to the Special Issue Remote Sensing of Landslides)
Full-Text   |   PDF [8806 KB, uploaded 18 July 2017]   |  

Abstract

From the wide range of methods available to landslide researchers and practitioners for monitoring ground displacements, remote sensing techniques have increased in popularity. Radar interferometry methods with their ability to record movements in the order of millimeters have been more frequently applied in recent years. Multi-temporal interferometry can assist in monitoring landslides on the regional and slope scale and thereby assist in assessing related hazards and risks. Our study focuses on the Corvara landslides in the Italian Alps, a complex earthflow with spatially varying displacement patterns. We used radar imagery provided by the COSMO-SkyMed constellation and carried out a validation of the derived time-series data with differential GPS data. Movement rates were assessed using the Permanent Scatterers based Multi-Temporal Interferometry applied to 16 artificial Corner Reflectors installed on the source, track and accumulation zones of the landslide. The overall movement trends were well covered by Permanent Scatterers based Multi-Temporal Interferometry, however, fast acceleration phases and movements along the satellite track could not be assessed with adequate accuracy due to intrinsic limitations of the technique. Overall, despite the intrinsic limitations, Multi-Temporal Interferometry proved to be a promising method to monitor landslides characterized by a linear and relatively slow movement rates. View Full-Text
Keywords: landslides; multi-temporal radar interferometry; X-band data; corner reflectors; validation; Dolomites landslides; multi-temporal radar interferometry; X-band data; corner reflectors; validation; Dolomites
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Schlögel, R.; Thiebes, B.; Mulas, M.; Cuozzo, G.; Notarnicola, C.; Schneiderbauer, S.; Crespi, M.; Mazzoni, A.; Mair, V.; Corsini, A. Multi-Temporal X-Band Radar Interferometry Using Corner Reflectors: Application and Validation at the Corvara Landslide (Dolomites, Italy). Remote Sens. 2017, 9, 739.

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