Physics
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.550e...3d&link_type=abstract
Proceedings of the FRINGE 2003 Workshop (ESA SP-550). 1-5 December 2003, ESA/ESRIN, Frascati, Italy. Editor: H. Lacoste. Publish
Physics
Scientific paper
Potential and limitation of ERS Differential SAR Interferometry for landslide analysis in the French Alps and Pyrenees is estimated. Geometrical constraints are a little stronger in the Alps than in the Pyrennes. By combining both ascending and descending ERS orbit, we show that around 5% of the total area cannot be imaged and only 50% can be imaged on both orbits. As most of the areas are below the tree line, state surface variation between acquisitions lead to dramatically loss of coherence. Only images acquired with high temporal repetitivity (1 day or 3 days) are suitable for landslide studies. Then, a landslide called La Valette , placed in the southern French Alps is studied using 15 differential interferograms produced from SAR images acquired by ERS 1 and ERS 2 satellites between 1991 and 1999. Velocity maps of La Valette landslide have been established. Four domains characterized by their own velocity field have been detected. Three of them can be distinguished from aerial photographs and field analysis. Slow velocity of a resistive bar located near the top of the landslide has been detected on SAR interferograms. Between 1991 and 1996, evolution of the limits of the landslide has been observed both in the upper and in the lower part, by a back erosion corresponding with the main scarp and a progress of the main body of the landslide. The average velocity of the landslide between 1991 and 1999 decreased from 1cm/day to 0.2cm/day in agreement with ground based measurements.
Allemand Pascal
Carnec Claudie
Delacourt Christophe
Picard Franck
Raucoules Daniel
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