1,722,012 research outputs found
Unmanned aerial vehicle RGB-orthomosaics of Arctic Ocean sea ice surface during MOSAiC leg 5, Aug-Sep 2020
No full textAerial RGB photographs of the Arctic Ocean sea ice surface were captured during MOSAiC (Leg 5) in August–September 2020 (https://doi.org/10.1594/PANGAEA.945980). This dataset comprises RGBA orthomosaics in GeoTiff format, created from DJI Mavic 2 Pro drone flights conducted over the Central Observatory 3 (CO3). The data is projected using the UTM51N coordinate system (EPSG: 32651).
The primary goal of this dataset is to facilitate the interpretation of co-located Unmanned Aerial Vehicle (UAV)-based spectral and broadband albedo observations (https://doi.pangaea.de/10.1594/PANGAEA.974281). However, orthomosaics also offer insights into sea ice surface conditions for a variety of other applications. The filenames include info on the date, the location over the ice camp (Place), and the flight number. The time indicated in the filename refers to the timestamp of the first photograph of the flight. In most cases, the photograph's geotags underwent ice drift compensation before alignment, as indicated by the suffix 'driftC' at the end of the filename. If the original geotags were used, the filename includes the suffix 'original'. All files are provided at their original full spatial resolution ranging between 0.71 and 1.54 cm
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
UAV-based broadband albedo of Arctic Ocean sea ice surface during MOSAiC leg 5, Aug-Sep 2020
No full textBroadband surface albedo over Arctic Ocean sea ice was measured using an unmanned aerial vehicle (UAV) system called Spectra during Leg 5 of the MOSAiC expedition in August–September 2020. A series of horizontal transects and vertical profiles were flown at altitudes of approximately 5 m, 10 m, and 30 m on seven separate days between August 29 and September 12. The primary goal of these measurements was to characterize the evolution of surface broadband albedo during the onset of autumn freezing and to investigate the spatial variability of albedo across the heterogeneous Arctic sea ice cover at multiple spatial scales.
This dataset includes broadband downwelling and upwelling shortwave irradiance measurements recorded by upward- and downward-facing pyranometers at 5-second intervals. Both raw data and calibrated radiative flux values are provided. The pyranometers were mounted on three-axis stabilizing gimbals, which also recorded x, y, and z acceleration and inclination at 1-second intervals. Each pyranometer's temperature was logged every 5 seconds. Additionally, detailed UAV attitude and positional data were recorded by the autopilot system at 100–200 millisecond intervals. To supplement positional tracking, a secondary GPS unit mounted on the main body of the Spectra UAV offered redundant measurements of position and velocity.
Data recording began when a custom measurement script was manually initiated and continued until the script was terminated or the system was powered off. Prior to each flight, instruments recorded for at least 30 minutes to allow sensor stabilization and thermal equilibration with the ambient temperature. UAV autopilot logs are available for periods when the UAV was armed.
Metadata for all measurement activities, along with a description of the available data files, is provided in a dedicated Excel spreadsheet. In addition, a summary .txt file compiles information from the various data files. This summary includes indicative classifications of measurement subtypes - such as UAV hovering over approximately the same location, horizontal transect flights, stationary on ice, pre-flight preparations, or landing phases. Quality flags (/) have been added to indicate data values falling outside the physical measurement range. These flags are applied to both raw and calibrated pyranometer irradiance values, pyranometer temperatures, and broadband albedo measurements.
The shortwave irradiance values in the original data files are based on sensitivity coefficients obtained during an outdoor calibration conducted prior to the expedition. In contrast, the accompanying .txt file uses updated sensitivity values derived from a more recent outdoor calibration performed after the expedition
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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