Challenges and limitations in geodetic monitoring of landslides, casestudy of Viella (Pyrenees mountains) and La Valette (Southern Alps), France
Résumé
To better understand the kinematics of landslides in mountainous areas, permanent GNSS receivers and reflectors monitored by an automated total station are sometimes installed. The challenge is to describe the surface displacements as accurately as possible with an adequate observation rate (from a few seconds to 1 or 2 hours or more). After a brief review of the methods and equipment used to reduce measurement errors, such as atmospheric refraction, instability of some reference points outside the sliding zone, etc., we describe the processing of terrestrial and GNSS data from two monitored landslides in the Pyrenees (Viella site) and the Southern Alps (La Valette site).
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