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Modelli 3D del centro storico di un borgo medievale prodotti con tecnica LiDAR terrestre
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Laser scanner survey and 3-d modeling of the Cetara tower on the amalfitan coast.
No full textThe main goal of this work is to study and experiment the use of the terrestrial laser scanning technique in order to survey an architectural heritage. The experiment concerns the survey and the modeling of a tower characterized by a very articulated plan and a complex geometry placed in Cetara (Amalfitan Coast). We used three different laser scanners: Cyrax HDS2500, Optech ILRIS-3D and Riegl LMSZ420.
The surveys carried out with the three different instruments demanded different design, planning and execution of the experiment. In order to carry out the survey of the Tower it has been necessary to run a high number of scans from various points of view and with different resolutions. This was necessary for the correct reconstruction of the architectonic elements which are complex and difficult to bring to simple and linear geometries. Modeling has been carried out using several commercial softwares used to filter the scan results and to reconstruct the 3D model of point clouds and the solid model by means of triangulation.
By means of the DTMs derived from the three laser scanners we finally elaborated a number of orthophotos using a digital photogrammetrical software. We started from the images acquired with a semi-metric camera, the Nikon D100; we compared our different orthophotos among them and with that one derived from the DTM obtained by means of digital matching on the photogrammetric stereo pair. Such a comparison was made on a number of common check points
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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