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Open AccessArticle

Reliability and Uncertainties of the Analysis of an Unstable Rock Slope Performed on RPAS Digital Outcrop Models: The Case of the Gallivaggio Landslide (Western Alps, Italy)

1
Department of Earth and Environmental Sciences, University of Pavia, 27100 Pavia, Italy
2
Research Institute for Geo-Hydrological Protection (CNR-IRPI), National Research Council of Italy, 10135 Torino, Italy
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(10), 1635; https://doi.org/10.3390/rs12101635
Received: 23 April 2020 / Revised: 13 May 2020 / Accepted: 19 May 2020 / Published: 20 May 2020
(This article belongs to the Special Issue Application of UAVs in Geo-Engineering for Hazard Observation)
A stability investigation based on Digital Outcrop Models (DOMs) acquired in emergency conditions by photogrammetric surveys based on Remote Piloted Aerial System (RPAS) was conducted on an unstable rock slope near Gallivaggio (Western Alps, Italy). The predicted mechanism of failure and volume of the unstable portion of the slope were successively verified on the DOMs acquired after the rockfall that effectively collapsed the May 29th, 2018. The comparison of the pre- and post-landslide 3D models shows that the estimated mode of failure was substantially correct. At the same time, the predicted volume of rock involved in the landslide was overestimated by around 10%. To verify if this error was due to the limited accuracy of the models georeferenced in emergency considering only the Global Navigation Satellite System/Inertial Measurement Unit (GNSS/IMU)-information of RPAS, several Ground Control Points (GCPs) were acquired after the failure. The analyses indicate that the instrumental error in the volume calculation due to the direct-georeferencing method is only of the 1.7%. In contrast, the significant part is due to the geological uncertainty in the reconstruction of the real irregular geometry of the invisible part of the failure surface. The results, however, confirm the satisfying relative accuracy of the direct-georeferenced DOMs, compatible with most geological and geoengineering purposes. View Full-Text
Keywords: rockfalls; RPAS; Digital Outcrop Model; rock slope stability analysis rockfalls; RPAS; Digital Outcrop Model; rock slope stability analysis
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MDPI and ACS Style

Menegoni, N.; Giordan, D.; Perotti, C. Reliability and Uncertainties of the Analysis of an Unstable Rock Slope Performed on RPAS Digital Outcrop Models: The Case of the Gallivaggio Landslide (Western Alps, Italy). Remote Sens. 2020, 12, 1635.

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