Detection and geometric characterization of rock mass discontinuities using a 3D high-resolution digital outcrop model generated from RPAS imagery – Ormea rock slope, Italy

Menegoni, Niccolò; Giordan, Daniele; Perotti, Cesare; Tannant, Dwayne D.

doi:10.1016/j.enggeo.2019.02.028

Cited by 115 publications

(58 citation statements)

References 35 publications

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“…After, the dense point cloud could be interpolated, simplified, classified, and finally textured for photo-realistic visualization (Nex and Remondino 2014). The photo-realistic representation is one of the most relevant results of SfM for engineering geology applications that, for example, can be used for a bedrock discontinuity analysis (Menegoni et al 2019). Another significant result of the SfM procedure is the orthophoto generation of the surveyed area.…”

Section: Ground Control Pointsmentioning

confidence: 99%

“…Nevertheless, the final accuracy is dependent not only on the GCP-related accuracy, density, and distribution within the surveyed area but also on image quality and percentage of overlap between single frames. TS is particularly useful for the acquisition of GCPs on vertical slopes (Menegoni et al 2019). GCPs measured using TS and GNSS receivers can allow a high level of accuracy in the images exterior orientation, which is particularly important for subsequent fractures and rock block measurements.…”

Section: The Use Of Uav For Rock Mass Classification and Structural Amentioning

confidence: 99%

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The use of unmanned aerial vehicles (UAVs) for engineering geology applications

Giordan

Adams

Aicardi

et al. 2020

Bull Eng Geol Environ

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236

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This paper represents the result of the IAEG C35 Commission "Monitoring methods and approaches in engineering geology applications" workgroup aimed to describe a general overview of unmanned aerial vehicles (UAVs) and their potentiality in several engineering geology applications. The use of UAV has progressively increased in the last decade and nowadays started to be considered a standard research instrument for the acquisition of images and other information on demand over an area of interest. UAV represents a cheap and fast solution for the on-demand acquisition of detailed images of an area of interest and the creation of detailed 3D models and orthophoto. The use of these systems required a good background of data processing and a good drone pilot ability for the management of the flight mission in particular in a complex environment.

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Section: Ground Control Pointsmentioning

confidence: 99%

Section: The Use Of Uav For Rock Mass Classification and Structural Amentioning

confidence: 99%

The use of unmanned aerial vehicles (UAVs) for engineering geology applications

Giordan

Adams

Aicardi

et al. 2020

Bull Eng Geol Environ

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236

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“…Position of the 144 adult males considered in the analyses. Orthoimage was obtained by the use of a Remotely Piloted Aircraft System, as described in the supplementary material(Menegoni et al 2019).…”

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confidence: 99%

Close encounters of the three morphs: does color affect aggression in a polymorphic lizard?

Scali¹,

Sacchi

Coladonato

et al. 2020

Preprint

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Color polymorphism is genetically controlled and the process generating and maintaining morphs can affect speciation and/or extinction rates. Competition and aggression among morphs can contribute to polymorphism maintenance and color badges are useful signals in intraspecific communication, because they convey information about alternative strategies and avoid unnecessary conflicts. This could lead to an uneven spatial distribution of morphs in a population, because the local frequency of each morph establishes the intensity of the competition in that neighborhood, and then the fitness of each male. We used a polymorphic lizard, Podarcis muralis, to assess if aggression varies among morphs under two contrasting hypotheses: a heteromorphic vs. a homomorphic aggression. We used laboratory mirror tests after lizard color manipulation and we verified the results consistency with the analysis of the spatial distribution of morphs in a wild population. Both the experiments confirmed that aggression is morph-specific and notably homomorphic. The adoption of behavioral alternative strategies that minimize risks and costs of unwanted conflicts could facilitate the stable coexistence of the phenotypes and reduce the resource competition. A bias in aggression to like-coloured males would advantage rarer morph, which would suffer less harassment by common morphs and obtain a fitness advantage. This process would be negatively-frequency-dependent and would stabilize polymorphism in the populations, possibly leading to sympatric speciation.

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“…In recent years, the application of remote sensing techniques for the development of Digital Outcrop Models (DOMs) and the analysis of unstable rock slopes has been continuously increasing (e.g. [1][2][3][4][5][6][7]). The geological and engineering investigations performed by DOMs easily overcome most of the limitations of the traditional field-based survey, as the inaccessibility of the rock slopes, their unfavourable orientation and the high risk for the operators [8].…”

Section: Introductionmentioning

confidence: 99%

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)

2020

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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.

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Detection and geometric characterization of rock mass discontinuities using a 3D high-resolution digital outcrop model generated from RPAS imagery – Ormea rock slope, Italy

Cited by 115 publications

References 35 publications

The use of unmanned aerial vehicles (UAVs) for engineering geology applications

The use of unmanned aerial vehicles (UAVs) for engineering geology applications

Close encounters of the three morphs: does color affect aggression in a polymorphic lizard?

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)

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