1,720,961 research outputs found
Crowdsensing Close-Range Photogrammetry for Accurately Reconstructing a Digital Twin of a Cultural Heritage Building Using a Smartphone and a Compact Camera
No full textThe development of user-friendly and cost-effective survey technologies is critical in the protection and preservation of cultural heritage structures. Although they are commonly reconstructed using digital photogrammetry techniques, and with the integration of Terrestrial Laser scanners and Remotely Piloted Aircraft Systems, they are now increasingly being modeled by crowdsensed systems, which are easily accessible even to non-expert users. As such, the goal of this research is to evaluate the performance of a smartphone and a commercial compact camera in reconstructing a detailed and accurate digital twin of a cultural heritage object. In both cases, the close-range photogrammetric technique, based on the combination of Structure for Motion and Computer Vision approaches, was used. Those methods were tested on the Ognissanti Church, located in Valenzano, Italy. MicMac Graphic User Interface and CloudCompare, two open-source software and user-friendly interfaces, were used throughout the process. Thus, once camera calibration, preprocessing, and processing phases were completed, both collected databases were compared on the base of tie points image matching, average residuals in block-bundle adjustment resolution, and processing times. Despite variations in acquisition resolution and instrumental stability, and the fact that the point cloud from smartphone camera is 3 times less dense than that from compact camera, picture matching is equivalent after 15 to 20 orientation repetitions. The resulting two clouds were almost overlapping, with an average distance of 0.01 m. These findings also matched previous outcomes in the literature for small-volume reconstruction, substantiating the notion of performance independence from the size of the modified item
An interactive webgis framework for coastal erosion risk management
Full text linkThe Italian coastline stretches over about 8350 km, with 3600 km of beaches, representing a significant resource for the country. Natural processes and anthropic interventions keep threatening its morphology, moulding its shape and triggering soil erosion phenomena. Thus, many scholars have been focusing their work on investigating and monitoring shoreline instability. Outcomes of such activities can be largely widespread and shared with expert and non-expert users through Web mapping. This paper describes the performances of a WebGIS prototype designed to disseminate the results of the Italian project Innovative Strategies for the Monitoring and Analysis of Erosion Risk, known as the STIMARE project. While aiming to include the entire national coastline, three study areas along the regional coasts of Puglia and Emilia Romagna have already been implemented as pilot cases. This WebGIS was generated using Free and Open-Source Software for Geographic information systems (FOSS4G). The platform was designed by combining Apache http server, Geoserver, as open-source server and PostgreSQL (with PostGIS extension) as database. Pure javascript libraries OpenLayers and Cesium were implemented to obtain a hybrid 2D and 3D visualization. A user-friendly interactive interface was programmed to help users visualize and download geospatial data in several formats (pdf, kml and shp), in accordance with the European INSPIRE directives, satisfying both multi-temporal and multi-scale perspectives
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
A WebGIS Prototype for Visualizing and Monitoring the Spatio-temporal Changes in Seawater Quality
No full textAnthropogenic pressure on the coastal areas triggers a shoreline deep evolution, impacting the marine-coastal ecosystem. A specific fact-finding tool should be developed to detect the potential damages suffered by such an environment both qualitatively and quantitatively. Web Geographical Information Systems (WebGIS), developed to store, and handle geospatial big data, as well as disseminate information generated by processing raw data, appears as an optimal solution to address those needs. Indeed, they allow integrating own data with those ones provided by external sources into a single web application, easily accessible through an interactive and straightforward interface. This may interest several types of target audiences, such as local/national authorities and scientific communities. Therefore, this research is aimed at introducing a WebGIS prototype, developed to analyze and visualize seawater quality data in the Puglia region (Southern Italy). System features and capability was designed considering potential consumers’ requirements, and, in accordance with Open Geospatial Consortium and European directive INSPIRE, its infrastructure was developed using Free and Open-Source Software for Geographic information systems. Thus, after defining the end-users and capturing their needs, the platform was built using the three-tier configuration. The levels were devoted to presenting, analyzing, and storing the data, respectively. Additionally, a user-friendly interface, allowing two-dimensional data visualization, was also programmed to help the not-skilled consumers in consulting the stored data. The developed WebGIS allows both multi-temporal and multi-scale analysis to evaluate and monitor seawater quality permitting local authorities to plan the adequate remedial actions
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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