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Sensors 2009, 9(1), 616-630; doi:10.3390/s90100616

Observation of a Large Landslide on La Reunion Island Using Differential Sar Interferometry (JERS and Radarsat) and Correlation of Optical (Spot5 and Aerial) Images

1,* , 2, 3, 2, 2, 4 and 2
1 Université Européenne de Bretagne, Université de Brest; CNRS; UMR 6538 Domaines Océaniques; Institut Universitaire Européen de la Mer, Place Copernic, 29280 Plouzané, France 2 BRGM, Aménagement et Risque Naturels, 3 avenue Claude Guillemin, 45060 Orléans cedex 2, France 3 Laboratoire de Planétologie et Géodynamique, CNRS/UMR 6112, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes cedex, France 4 Laboratoire Sciences de la Terre – UCBL&ENS-UMR 5570 CNRS Bat Géode 2 Rue Dubois 69622 Villeurbanne Cedex, France
* Author to whom correspondence should be addressed.
Received: 4 November 2008 / Revised: 12 January 2009 / Accepted: 13 January 2009 / Published: 21 January 2009
(This article belongs to the Special Issue Synthetic Aperture Radar (SAR))
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Slope instabilities are one of the most important geo-hazards in terms of socio-economic costs. The island of La Réunion (Indian Ocean) is affected by constant slope movements and huge landslides due to a combination of rough topography, wet tropical climate and its specific geological context. We show that remote sensing techniques (Differential SAR Interferometry and correlation of optical images) provide complementary means to characterize landslides on a regional scale. The vegetation cover generally hampers the analysis of C–band interferograms. We used JERS-1 images to show that the L-band can be used to overcome the loss of coherence observed in Radarsat C-band interferograms. Image correlation was applied to optical airborne and SPOT 5 sensors images. The two techniques were applied to a landslide near the town of Hellbourg in order to assess their performance for detecting and quantifying the ground motion associated to this landslide. They allowed the mapping of the unstable areas. Ground displacement of about 0.5 m yr-1 was measured.
Keywords: DInSAR; Optical Correlation; Landslide DInSAR; Optical Correlation; Landslide
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Delacourt, C.; Raucoules, D.; Le Mouélic, S.; Carnec, C.; Feurer, D.; Allemand, P.; Cruchet, M. Observation of a Large Landslide on La Reunion Island Using Differential Sar Interferometry (JERS and Radarsat) and Correlation of Optical (Spot5 and Aerial) Images. Sensors 2009, 9, 616-630.

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