1,720,982 research outputs found
Integrated Use of Geomatic Methodologies for Monitoring an Instability Phenomenon
No full textThe growing exposure of the Italian territory to hydrogeological risk, also worsened by the influence of climate change, has made the occurrence of catastrophic phenomena, such as landslides and floods, always more impactful. In this frame, geomatic methodologies can provide a crucial support in properly characterizing a potentially critical instability phenomenon, both from the spatial and kinematic view. In this work, the integrate use of geomatic methodologies, i.e., Multi-temporal Interferometric Synthetic Aperture Radar (MTInSAR) technology and structural sensors, namely biaxial tiltmeters, were employed to kinematically investigate the behavior of an urban area affected by a landslide, located in the Apulian territory. The MTInSAR analysis carried out on Sentinel-1 SAR acquisitions showed a strong non-linear behavior in the displacement-time trends, also highlighting the presence of differential motions constituting a threat for buildings. As regards the main retaining structure, currently damaged by the landslide, automatic measurements provided by the tiltmeters confirmed the presence of more active areas, as detected by the SAR observations. The outcomes of this work provided key information to the structures responsible for the management of the risk connected with the instability and allowed to address the proper design of the mitigation works. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG
Using the Intensity Values Obtained from Terrestrial Laser Scanner for Monitoring the Effects of Plant Disease: The Case Study of Gorgognolo (Italy)
No full textThe continuous growth of agricultural production requires efficient strategies to manage the cultivation activities and ensure a high-quality standard for the food products. In this regard, the increased circulation of pathogens, also exacerbated by the consequences of climate change, represents a threat for environmental and agricultural assets. By the way of example, in recent years, the Xylella fastidiosa (Xf) bacterium has caused significant damage to the olive growing in the Apulia region, located in the south of Italy, with a consequent relevant economic impact. Geomatic methodologies for the acquisition and processing of ground spatial data can play a crucial role in the prompt identification of the effects of potentially harmful phenomena, such as Xf is, thus helping to develop effective countermeasures. This work presents the results of the analysis of a high-resolution three-dimensional dataset acquired with a Terrestrial Laser Scanner, which is generally used to reconstruct the shape of objects and structures. In this work, the intensity parameter associated to the point cloud has been investigated to infer information on the progression of the plant disease on a set of olive trees located in the Salento peninsula (Italy). These preliminary results could constitute the basis to design a strategy useful to monitor the effects of the spreading of Xf on medium-scale areas
Landslide risk and monitoring system for conservation of Vardzia monastery, Georgia
No full textThe present paper reports preliminary results of a feasibility project developed in cooperation with National Agency for Cultural Heritage Preservation of Georgia, aimed at envisaging the stability conditions of the slope-forming rocks of the Vardzia Monastery (rupestrian city cave in the south-western Georgia) and finalized to the implementation of a low impact monitoring systems together with long term mitigation/conservation policies. A field analysis was conducted to reconstruct geometry of the rock cliff, characteristics of discontinuities, main failure modes of potential unstable blocks, magnitude of phenomena and geom.-echanical parameters. Instability processes are the result of different combination of causative factors such as: lithology, frequency and orientation of discontinuities versus slope orientation, physical and mechanical characteristics of slope-forming materials, morphological and hydrological dynamics. The adoption of different survey techniques (e.g. 3D laser scanner, Ground Base Radar Interferometry) adopted together could be the best solution in the interdisciplinary field of Cultural Heritage preservation policies. © 2013 Taylor & Francis Group, London
Controllo deformativo di un’area in frana mediante integrazione di tecniche topografiche e fotogrammetriche sull’isola di Stromboli
No full textPer controllare fenomeni deformativi di ampie zone con precisioni elevate è possibile integrare il rilievo topografico mediante stazione totale con tecniche di fotogrammetria digitale multi-temporale. Le due metodologie sono state utilizzate durante l’eruzione 2002-2003 del vulcano Stromboli.
Nel lavoro vengono illustrati i risultati ottenuti dai rilievi eseguiti sulla parte sommitale del versante della Sciara del Fuoco, dove la messa in posto delle colate ha prodotto un’area di accumulo considerata potenzialmente instabile. La disponibilità di rilievi aerofotogrammetrici effettuati dopo la fine dell’eruzione ha permesso di misurare le variazioni altimetriche attraverso il confronto di DTM (Digital Terrain Model) multi-temporali e vettori spostamento planimetrici ottenuti tramite la misura delle coordinate di numerosi punti naturali identificati su tutte le immagini. Sulla stessa area, al termine della fase effusiva, è stato possibile installare alcuni riflettori come punti di controllo da misurare tramite una stazione integrata posizionata all’esterno del versante. Dal 20 ottobre 2003 al 28 luglio 2006 sono stati effettuati complessivamente sette rilievi. Le misure topografiche sono state confrontate ed integrate con quelle ottenute per via fotogrammetrica. I dati ottenuti hanno contribuito al monitoraggio delle deformazioni ancora in atto sul versante dopo la fine dell’eruzion
Automated geomatic system for monitoring historical buildings during tunneling in Roma, Italy
No full textThe present work is focused on the preliminary results obtained through the geomatic integrated monitoring system currently running at the test site of the Basilica of Maxentius in the Roman Forum. The system is aimed at controlling a number of archaeological sites which can be potentially affected by the tunneling works for a new metro line which is presently under construction. It includes different high precision geomatic sensors controlled by a centralized control station which continuously acquire data at high frequency. In order to identify a reliable processing procedure and assess the quality of the collected data, we started to develop and experiment a preliminary analysis of the data collected in the first period of the system operation (before the start of the excavation works). This activity allowed us to assess the performance of each sensor, focusing on the capability of the system to control also the stability of the monitoring stations. The obtained results will be adopted to better define an automated procedure for future massive data processing
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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