Image Classification for Automated Image Cross-Correlation Applications in the Geosciences

Dematteis, Niccolò; Giordan, Daniele; Allasia, Paolo

doi:10.3390/app9112357

Cited by 13 publications

(13 citation statements)

References 42 publications

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“…We used one image per day, when available, acquired in conditions of diffuse illumination to minimise the noise introduced by the shadows produced by direct light (Ahn and Box, 2010; Giordan and others, 2016). The shadow-related noise impeded the use of sub-daily time-lapses because it lowered the signal-to-noise ratio and increased the error (Dematteis and others, 2019). We estimated the ICC uncertainty by analysing the displacement measured on the stable surfaces (i.e., exposed bedrock).…”

Section: Methodsmentioning

confidence: 99%

Classification and kinematics of the Planpincieux Glacier break-offs using photographic time-lapse analysis

2020

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Herein, we present results obtained from time-lapse imagery acquired by a digital single-lens reflex camera during 2014–18 used to monitor the Planpincieux Glacier on the Italian side of the Grandes Jorasses (Mont Blanc massif). We processed the images using image cross-correlation to measure the surface kinematics of the most active lobe of the glacier that presents a high velocity and frequent ice detachments. During the monitoring, we observed two or three periods of sharp acceleration per year that culminated with large break-offs followed by analogous decelerations. Overall, we registered more than 350 failures with a volume >100 m3, of which, 14 events had volumes larger than 10 000 m3. The study identified a monotonic positive relationship between the velocity and failure volume that may be used to estimate the volume of the collapses before an event. We identified the thresholds of velocity and acceleration that characterise the activation of the speed-up periods. The study allowed the characterisation of three different instability processes that lead to the break-off of ice chunks from the glacier terminus: (i) disaggregation, (ii) slab fracture and (iii) water tunnelling failure which can be differentiated based on the rheology, the volume involved and the trigger process.

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Section: Methodsmentioning

confidence: 99%

Classification and kinematics of the Planpincieux Glacier break-offs using photographic time-lapse analysis

2020

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“…1. Image selection: We used images acquired within the same period of the year and at similar hours to guarantee a similar sun elevation and azimuth to minimize shadow changes that might introduce ZNCC artefacts (Dematteis et al 2019). Moreover, we discarded images with snow coverage or clouds, especially those nearby the landslide areas; we also discarded images with different orthorectifications.…”

Section: Digital Image Correlation For Coevent Displacement Estimationmentioning

confidence: 99%

A multidisciplinary investigation of deep-seated landslide reactivation triggered by an extreme rainfall event: a case study of the Monesi di Mendatica landslide, Ligurian Alps

et al. 2021

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In November 2016, an extreme rainfall event affected the Ligurian Alps (NW Italy). Consequently, several landslides and debris flows occurred in the upper Tanarello stream basin. In particular, the village of Monesi di Mendatica was severely damaged by two landslide phenomena: the activation of a rotational landslide, which caused the total collapse of two buildings and part of the main road, and the reactivation of a deep-seated planar massive and a complex landslide, which widely fractured most of the buildings in the village. The latter phenomenon was mostly unknown and had never been monitored prior to the 2016 event. Due to the extensive damage, the village of Monesi was completely evacuated, and the road connecting a ski resort area in the upper part of the valley was closed. Furthermore, a potentially dangerous situation related to the eventual progressive evolution of this landslide that could cause a temporary occlusion of the Tanarello stream still remains. For this reason, we defined the landslide behaviour, triggering conditions and chronological evolution leading to the 2016 event using a multidisciplinary approach. This approach consisted of field surveys, satellite DInSAR time series analyses, digital image correlation techniques, rainfall records analyses, postevent monitoring campaigns and subsurface investigation data analyses, and numerical modelling. This multidisciplinary approach enhanced our understanding of this landslide, which is fundamental to better comprehend its behaviour and possible evolution.

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“…In the last decades, the Planpincieux-Grandes Jorasses Glacier complex has become an open-air laboratory where innovative remote sensing techniques have been developed to monitor the glacier activity [6][7][8][9][10][11][12].…”

Section: Monitoring Campaignsmentioning

confidence: 99%

“…Section 3 is devoted to the Planpincieux and Grandes Jorasses glaciers (Mont Blanc massif) case study (Figure 1). In recent years, such a glacial complex has become an open-air laboratory where innovative and experimental monitoring systems have been developed [6][7][8][9][10][11][12]. Several practical examples of close-range remote sensing surveys will be described therein.…”

Section: Introductionmentioning

confidence: 99%

Close-Range Sensing of Alpine Glaciers

Giordan¹,

Dematteis²,

Troilo³

et al. 2021

Glaciers and the Polar Environment

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Glacial processes can have a strong impact on human activities in terms of hazards and freshwater supply. Therefore, scientific observation is fundamental to understand their current state and possible evolution. To achieve this aim, various monitoring systems have been developed in the last decades to monitor different geophysical and geochemical properties. In this manuscript, we describe examples of close-range monitoring sensors to measure the glacier dynamics: (i) terrestrial interferometric radar, (ii) monoscopic time-lapse camera, (iii) total station, (iv) laser scanner, (v) ground-penetrating radar and (vi) structure form motion. We present the monitoring applications in the Planpincieux and Grandes Jorasses glaciers, which are located in the touristic area of the Italian side of the Mont Blanc massif. In recent years, the Planpincieux-Grandes Jorasses complex has become an open-air research laboratory of glacial monitoring techniques. Many close-range surveys have been conducted in this environment and a permanent network of monitoring systems that measures glacier surface deformation is presently active.

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Image Classification for Automated Image Cross-Correlation Applications in the Geosciences

Cited by 13 publications

References 42 publications

Classification and kinematics of the Planpincieux Glacier break-offs using photographic time-lapse analysis

Classification and kinematics of the Planpincieux Glacier break-offs using photographic time-lapse analysis

A multidisciplinary investigation of deep-seated landslide reactivation triggered by an extreme rainfall event: a case study of the Monesi di Mendatica landslide, Ligurian Alps

Close-Range Sensing of Alpine Glaciers

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