1,720,960 research outputs found
TECNICHE DI RILEVAMENTO PER LA PREVENZIONE DEI RISCHI AMBIENTALI
No full textSurface monitoring is essential to understand the spatial and temporal evolution of complex landscape modifications and instabilities related to road and railway infrastructures. In recent years, the terrain change detection methods have evolved particularly with the development of increasingly automatic extraction procedures of both DTM and DSM. Prevention of damages caused by natural disasters does not only concern weather forecasts, but requires constant attention and practice of monitoring and controlling human activity on territory. Practically, the problem is not knowing if and when an event will affect a determined area, but recognizing the possible damages if this event happened, by adopting adequate measures to keep them down as far as possible, and requires the necessary tools for a timely intervention. To solve such requirements, current satellite technology, with recurrent data acquisition for the timely generation of cartographic products updated and coherent to the territorial investigation, offers the possibility to fill the temporal gap between the need of urgent information and official reference information. The fundamental merits of the high resolution remote sensing methods are the ability to perform surveys at regular intervals, the characteristics of the image and the revisit times. These features are very useful in environmental monitoring especially in the event of emergency or also in medium scale cartographic production, particularly in the zones of difficult access and in developing countries. The research presented here aims at answer to the growing need of optimization and rationalization of long term monitoring systems of displacements and degradation due to the interaction of artificial artifacts of transport with such natural phenomena. To test the methodology we chose an area that presents a particular geo-morphological setting, in the municipality of Fasano (BR, Southern Italy). The area is affected by frequent hydrogeological dangerous events such as flooding and is classified as a zone of “high hydraulic hazard” in the regional Hydrogeological Structure Plan (PAI). For this area we used a GeoEye-1 stereo-pair for extracting a DTM in order to verify the usefulness of satellite techniques for the recognition of environmental risks
Assessing the relationship between urban parameters and the LST derived by satellite and aerial imageries in a GIS environment: the case of Bari (Italy).
No full textAssessing the relationship between urban parameters and the LST derived by satellite and aerial imageries in a GIS environment: the case of Bari (Italy). The use of thermal remote sensing to estimate the phenomenon of urban heat islands (UHI) and development of climate anomalies in urban context represents a consolidated approach. In the current scientific literature a widespread case studies were focused on the estimation of the relationship between features related to the urban environment and the Land Surface Temperatures (LST). The latter is a basic starting observation in the investigation on the UHI phenomenon . However, the evaluation of these relationships is rather difficult. This is due to deficiencies in the detailed knowledge of parameters able to describe geometric and qualitative properties of land covers. These properties are very often not repeatable and not easily transferable in other contexts. In addition, many of the relevant parameters are difficult to be determined at the required spatial resolution and analyses are affected by a lack in the amount of quantitative parameters used. In addition to the LST, several useful indicators are introduced by the literature in the investigation of such phenomena. The objective of this work is to study the relationship between the LST and a set of variables that characterize the anthropic and natural domains of the urban areas, such as urban morphology, the Normalized Differenced Vegetation Index (NDVI), the Sky View Factor (SVF) and other morphometric parameters implemented within a GIS environment. The study case is the city of Bari (Southern Italy) where several recognizable morphologies exhibit a different thermal behavior. The LST parameter was derived from a collection of satellite ASTER images collected within a period spanning from July 2001 and July 2006, whereas aerial thermal imageries were acquired on September 2013. The basic data used for the determination of the descriptive parameters of the urban environmental are derived from digital maps(Geographic Information System of the Apulia Region), Digital Elevation Model and Land Use. The analysis of satellite and aerial thermal images available at different spatial resolutions and related to varying epochs helped to highlight variables which seem more appropriate to define the relationships between the LST and the urban features at different scales of analysis. This derived relationship far from linearity and more complex rules are needed to explain the mutual dependency between the parameters. A multivariate statistical analysis was therefore used to adequately represent both the mutual relationships among the explanatory variables and between the explanatory variables and the LST
From Daunii Archaeological Park toThe Faragola Domus Romana: the New Treasures of The Old Ausculum
No full textThe present study deals with a very important but not very well-known cultural heritage area, which is located in Southern Italy, in the municipality of Ascoli Satriano (in the Foggia province). The area represents the vestige of one of the principal settlements of the Daunian peoples (VI-IV century B.C.). In this area, the Carapelle Valley represented an ancient communication route between the Campania Region and the Apulia "Tavoliere", ever since a very fertile territory, where many flourishing rural communities established themselves. On the "Collina del Serpente" (the Snake hill) systematic research of the University of Innsbruck allowed to locate the remains of the ancient town of Ausculum as well as a large Necropolis (IV century B.C.) with very rich funeral furnishings. Not far away, in the Carapelle valley, at the Faragola site, the archaeological excavations unearthed a beautiful luxurious "domus romana" of late ancient times (IV-VI century A.D.). Based on the principle that preservation of cultural/archaeological heritage starts from recognition and measuring of the opus, the work presented here treats the first phase of the study of the whole archaeological area. This research proposes the establishment of a GIS (Geographic Information System) which classifies all the information already collected by various study groups, in order to be able to present a "virtual museum" useful for utilization by more extensive audience
Valutazione della dispersione termica urbana con metodi satellitari
No full textAs demonstrated by the phenomenon of the Urban Heat Island (Oke, 1973), human activities, changes in land use, progressive permeabilization with the consequent evapotranspiration reduction, make the city temperature values higher than in the countryside. This study aims to analyze the relationships between temperature and a series of urban parameters (urban density, green, materials, etc.) in order to take account of these aspects in the urban planning to mitigate urban climatic phenomenon.
The research is so divided in two parallel tracks: the analysis of the physical structure of the city of Bari, for the study and the identification of the parameters above, and the thermal analysis of the same area using thermal bands of ASTER satellite imagery.
From the initial results can be highlighted as the mutual influence of the parameters is rather complex and can’t be described with a simplified model, but it takes a multivariate analysis that allows to represent the interactions of the variables in an accurate manner
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
Assessing the relationship between urban parameters and the LST derived by satellite and aerial imageries in a GIS environment: the case of Bari (Italy).
No full textAssessing the relationship between urban parameters and the LST derived by satellite and aerial imageries in a GIS environment: the case of Bari (Italy). The use of thermal remote sensing to estimate the phenomenon of urban heat islands (UHI) and development of climate anomalies in urban context represents a consolidated approach. In the current scientific literature a widespread case studies were focused on the estimation of the relationship between features related to the urban environment and the Land Surface Temperatures (LST). The latter is a basic starting observation in the investigation on the UHI phenomenon . However, the evaluation of these relationships is rather difficult. This is due to deficiencies in the detailed knowledge of parameters able to describe geometric and qualitative properties of land covers. These properties are very often not repeatable and not easily transferable in other contexts. In addition, many of the relevant parameters are difficult to be determined at the required spatial resolution and analyses are affected by a lack in the amount of quantitative parameters used. In addition to the LST, several useful indicators are introduced by the literature in the investigation of such phenomena. The objective of this work is to study the relationship between the LST and a set of variables that characterize the anthropic and natural domains of the urban areas, such as urban morphology, the Normalized Differenced Vegetation Index (NDVI), the Sky View Factor (SVF) and other morphometric parameters implemented within a GIS environment. The study case is the city of Bari (Southern Italy) where several recognizable morphologies exhibit a different thermal behavior. The LST parameter was derived from a collection of satellite ASTER images collected within a period spanning from July 2001 and July 2006, whereas aerial thermal imageries were acquired on September 2013. The basic data used for the determination of the descriptive parameters of the urban environmental are derived from digital maps(Geographic Information System of the Apulia Region), Digital Elevation Model and Land Use. The analysis of satellite and aerial thermal images available at different spatial resolutions and related to varying epochs helped to highlight variables which seem more appropriate to define the relationships between the LST and the urban features at different scales of analysis. This derived relationship far from linearity and more complex rules are needed to explain the mutual dependency between the parameters. A multivariate statistical analysis was therefore used to adequately represent both the mutual relationships among the explanatory variables and between the explanatory variables and the LST
UAV Surveys for Representing and Document the Cultural Heritage
No full textThe new survey techniques allow for a more detailed depiction of the characteristics of the cultural heritage of which our country is so rich. Unmanned Aerial Vehicles (UAV) are emerging as a key engineering tool for future environmental survey tasks. UAV aerial imagery offers both timely (on demand) and more detailed (higher resolution) information than comparable satellite imagery. In the present study the opportunities of obtaining more detailed documentation of cultural goods throughout UAV survey have been investigated. The survey was conducted on an ancient Aragonese watchtower of the seventeenth century, located near the Abbey of San Vito in the countryside of Polignano a Mare (in the province of Bari, Southern Italy) (Fig.1). The high resolution of the produced images, approximately 1 cm x pixels, allows to obtain all elements of both structural and qualitative information required for a conservative restoration project of the monument. The peculiarity of the transportation vehicle of the camera has also made it possible to detect the top surface of the roof covering of the building, normally not accessible, with the presence of a chimney and an access hatch, on which to intervene for the proper disposal of rainwater. The research refers to the metric characteristics, accuracy, level of detail, the particular crack patterns, etc., reachable by photogrammetric methods, with the help of dedicated software (Agisoft PhotoScan) such as Computer Vision methodologie
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
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