1,720,976 research outputs found
Güneydoğu Türkiye’de Arkeoloji ve Barajlar: Mevcut Belgelemeyi İyileştirmek İçin Su Tutma Sonrası Hasar Değerlendirme Uygulanması ve Kültürel Mirası Koruma Stratejileri
Full text linkThe construction of dams and their impact on cultural heritage are an ever-expanding problem, the more so in times of climate change and narrowly focused development policies. We analyze here a case study represented by three major reservoirs in the Middle Euphrates valley in southeastern Turkey (Atatürk, Birecik and Karkamış). We applied Post-Flooding Damage Assessment (PFDA) to evaluate the impact of dams on archaeological sites. Our PFDA consists of the analysis of cross-correlation of multi-temporal Landsat imagery, geographical spatial datasets and archaeological data from surveys and excavations: it provides an unprecedented, detailed overview of the loss of especially significant cultural landscapes, and also highlights the limited accuracy of pre-flooding archaeological surveys and excavations. Finally, we suggest an efficient methodology, a critical tool and recommendations for improving future designs of rescue archaeological projects targeting endangered cultural landscapes, with an immediately achievable target of a better-documented cultural heritage threatened by dams. In particular, we see a need to strengthen the existing legislation with specific working protocols providing guidelines on the identification, documentation and safeguard of the cultural heritage. These protocols must be supported by the state, which in turn must require their implementation by the bodies involved in the construction of the dams, such as the World Bank, the International Monetary Fund, the Asian Development Bank or the Inter-American Development Bank. In order to monitor the quality of whole work, the Turkish government should create a commission of international experts in the field of heritage with the purpose of monitoring the various projects from the proposal phase to completion of the last protocol
An Object-Oriented Approach to the Classification of Roofing Materials Using Very High-Resolution Satellite Stereo-Pairs
Full text linkThe availability of multispectral images, with both high spatial and spectral resolution, makes it possible to obtain valuable information about complex urban environment, reducing the need for more expensive surveying techniques. Here, a methodology is tested for the semi-automatic extraction of buildings and the mapping of the main roofing materials over a urban area of approximately 100 km2, including the entire city of Bologna (Italy). The methodology follows an object-oriented approach and exploits a limited number of training samples. After a validation based on field inspections and close-range photos acquired by a drone, the final map achieved an overall accuracy of 94% (producer accuracy 79%) regarding the building extraction and of 91% for the classification of the roofing materials. The proposed approach proved to be flexible enough to catch the strong variability of the urban texture in different districts and can be easily reproducible in other contexts, as only satellite imagery is required for the mapping
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
Utilizzo di immagini satellitari multispettrali ad alta risoluzione nella gestione di emergenze umanitarie
No full textNegli ultimi anni le agenzie umanitarie hanno ampliato il campo di utilizzo di immagini satellitari nella gestione delle emergenze - tipicamente impiegate a supporto della risposta a disastri naturali quali terremoti, alluvioni ed incendi - estendendolo alle crisi umanitarie. Il presente contributo è incentrato sull’analisi dell'evoluzione del campo di rifugiati siriani di Za'atari, istituito in territorio giordano nel luglio 2012 da parte della UN Refugee Agency (UNHCR). La metodologia di analisi multi-temporale è stata applicata su tre immagini satellitari ottiche ad alta risoluzione geometrica del campo profughi, elaborate mediante tecniche di classificazione assistita sia pixel-based sia object-based. L’elaborazione delle immagini è stata principalmente finalizzata all’analisi dell’evoluzione del campo ed alla stima della popolazione residente. Si è dimostrato come il telerilevamento satellitare possa fornire informazioni e dati dettagliati per la documentazione oggettiva a supporto della gestione di un'emergenza umanitaria
Satellite remote sensing and GIS-based multi-criteria analysis for flood hazard mapping
No full textThis work focuses on the exploitation of very high-resolution (VHR) satellite imagery coupled with multi-criteria analysis (MCA) to produce flood hazard maps. The methodology was tested over a portion of the Yialias river watershed basin (Nicosia, Cyprus). The MCA methodology was performed selecting five flood-conditioning factors: slope, distance to channels, drainage texture, geology and land cover. Among MCA methods, the analytic hierarchy process technique was chosen to derive the weight of each criterion in the computation of the flood hazard index (FHI). The required information layers were obtained by processing a VHR GeoEye-1 image and a digital elevation model. The satellite image was classified using an object-based technique to extract land use/cover data, while GIS geoprocessing of the DEM provided slope, stream network and drainage texture data. Using the FHI, the study area was finally classified into seven hazard categories ranging from very low to very high in order to generate an easily readable map. The hazard seems to be severe, in particular, in some urban areas, where extensive anthropogenic interventions can be observed. This work confirms the benefits of using remote sensing data coupled with MCA approach to provide fast and cost-effective information concerning the hazard assessment, especially when reliable data are not available
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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