1,720,971 research outputs found
High-precision topographical methodology for determining height differences when crossing impassable areas
No full textWith the arrival on the market of high-precision topographic total stations, professionals today, using appropriate methodologies, can determine altimetric connections to an accuracy that is almost comparable to those obtainable using high-precision geometric levelling. This aspect is of particular interest when it is not possible to proceed with classical geometric levelling operations due to logistical or other reasons: for instance, where levelling lines need to cross impassable areas such as streams, soft soils or canyons. Currently, height differences between two points separated by an impassable area are mainly measured using optical-mechanical levels by procedures that present a number of difficulties. This work presents the results achieved through several trials conducted on the use of high precision trigonometric levelling for measurement of height difference between benchmarks at opposite sides of streams. In particular, it describes the project where simultaneous and reciprocal measures were taken using two high-precision robotic total stations. © 2018 Elsevier Lt
Comparison of two technologies in 3D surveying of real estate assets and cultural heritage
No full textAccurate three-dimensional (3D) data from indoor spaces holds significant importance in various fields like real estate management, industrial archaeology and Cultural Heritage. Villa Maraffa complex, located near Ravenna (Italy), served as a case study for employing and comparing advanced technology and sensors in surveying these contexts. To acquire data, the sensors used were Matterport Pro 2 and Leica RTC360. The first one, mainly developed for real estate surveys, has been chosen because of the efficiency and cost-effectiveness in generating point clouds, although with lower precision compared to the Leica RTC360 Laser Scanner, the other sensor employed in this study. The focus of the paper is on assessing the point cloud's quality, with an analysis of the Matterport data, including global and specific evaluations. Potential issues like incomplete data and misalignment are identified by comparing coordinates from the Leica scanner. The results are examined to find an optimal solution for a prompt, precise, and well-timed survey, enabling a complete digital reconstruction of the object
Problematiche nel rilevamento 3D in alta risoluzione per i Beni Culturali
No full textLe potenzialità della Geomatica nel rilevamento dei Beni Culturali, anche nell’ambito di interventi complessi e dagli standard qualitativi particolarmente elevati, sono sempre più evidenti ed emergono da una molteplicità di interventi realizzati a fini di documentazione, supporto al restauro, diagnostica, realizzazione di repliche, ecc. Elemento caratterizzante ed accomunante delle esperienze condotte è la possibilità di integrare tra loro tecniche e metodiche diverse, caratterizzate dalla generazione di dati digitali e di qualità controllabile. Ai fini del rilievo tridimensionale si può ricorrere a tecnologie differenti in funzione della scala di lavoro e del dettaglio richiesto: dalla scansione laser con metodo a tempo di volo o triangolazione, ai sistemi a proiezione di luce strutturata, alla fotogrammetria. Ciascuna tecnica trova il migliore utilizzo in un ambito particolare ed offre vantaggi e svantaggi. Nel lavoro si descrive un esempio significativo che è stato condotto di recente nell’ambito delle attività finalizzate al restauro della Fontana del Nettuno di Bologna
Il Progetto Interreg Italy-Croatia SUstainable fiSHeries wIth DROnes data Processing (SUSHI DROP): aspetti geomatici
No full textImplementazione di un workflow semi-automatico per la rappresentazione di forme irregolari a fini HBIM
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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
Nel cuore del Nettuno: struttura, forma, colore
No full textIl saggio analizza le cause del degrado del cunicolo di collegamento della fontana col palazzo Apostolico, mediante l'analisi e il rilievo dettagliato dell'umidità presente nel cunicolo e mediante la rappresentazione delle sottoservizi presenti nella piazza. Inoltre prende in esame la costruttività dell'opera; attraverso l'esercizio di indagini non distruttive eseguite con gli ultrasuoni, con il georadar e termografiche vengono determinati gli spessori dei materiali che compongono il basamento e il catino del complesso statuario i cui elementi tecnici sono rappresentati in tridimensionale, al fine di comprenderne le giunzioni e quali possano essere le cause che hanno indotto e inducono percolamenti costanti all'interno del cunicolo. Infine il saggio prende in esame le modalità tecniche di intervento per eliminare le cause delle ingressioni delle acque meteoriche all'interno del cunicolo mediante interventi graduali nel tempo
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