Long Term Monitoring of Unstable Slopes by a Ground Based Synthetic Aperture Radar: a Case Study in Italy

Linhsia Noferini(1) , Massimiliano Pieraccini(1) , Guido Luzi(1) , Daniele Mecatti(1) , Giovanni Macaluso(1) , and Carlo Atzeni(1)

(1) University of Florence, via Lombroso 6/11B, Firenze, 50139, Italy

Abstract

In the last decade ground based synthetic aperture radar (GB-SAR) interferometry has been exten-sively used to follow terrain movements almost continuously: during the same measurement cam-paign landslide movements are sampled at rate of image acquisition, typically half an hour. In these cases the effect of temporal decorrelation is negligible, and GB-SAR interferometry proved to be a valid tool often complementary to satellite observations. Considering that, despite of spaceborne sensors, GB-SAR systems can be arranged avoiding geometric decorrelation, an effective employ of this approach can be obtained also for long temporal separation applications. Suitable processing techniques similar to those used in satellite interferometry can compensate for the loss of coherence related to atmospheric and dielectric variations. This work reports on the use of a GB-SAR inter-ferometer, working at C band, employed to detect long term terrain movements occurred during the six months elapsed between two different measurements campaigns, carried out to monitor a land-slide located in Northern Italy. A description of the applied processing techniques and an analysis of the attained results are discussed.

 

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