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ELEMENTI DI METODO PER LA VALUTAZIONE QUALI-QUANTITATIVA DEI CONTENUTI DI UNO STRUMENTO URBANISTICO: IL CASO DI CAGLIARI
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Multiscale Representation: A data generalization workflow and quality evalutation experience
No full textIn geographic data representation, users need specific tools for the representation and evaluation of the data on which the decision-making process relies. In cartographic applications, users need to deal with maps of the same geographic region at different levels of abstraction. In most cases one database per level of detail is maintained; a multiscale representation GIS would allow storage of all original geographic information in a single database and enforce the consistency of the different representations through appropriate, automatic generalization processes.
In this paper we deal with the problem of geographic data generalization, beginning from a generalization workflow by improving specific routines.
To reach the goals of the generalization process, we used the ESRI ArcGIS 8.1 platform. Inside this environment some generalization functions were implemented by improving appropriate routines in Visual Basic language. After a presentation of the generalization workflow, all geometric, topological and semantic cartographic constraints governing the generalization process are specified. In the next step these constraints will be translated into tools for assessing the need and the quality of generalization solutions. These tools are associated with a particular data model. For that data model the constraints can be best translated to measures and generalization algorithms and parameterized. This framework is based on constraints used to control the process and represent user requirements in such a way that the system is capable of reaching a quality close to these requirements; it reflects the idea that more than one acceptable solution to a given generalization problem may exist. The goal was the production of a topographic map at scales 1:50000, 1:100000 and 1:250000 from the “Carta Tecnica Regionale”, (CTR, official regional cartography) of the “Regione Autonoma della Sardegna”, RAS, (Regional Administration of Sardinia), at scale 1:10000, in a GIS environment.
In accordance with official national and international standards, we provide the definition of the characteristics and associated quality evaluation tool to be used in validating geographic data
LA CARTOGRAFIA NUMERICA NEL CONTROLLO DEL TERRITORIO: DETERMINAZIONE DELLE VARIAZIONI DELLA LINEA DI COSTA NEL LITORALE DI CAGLIARI
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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
SURVEY OF A LOCAL NETWORK TO CHECK THE STABILITY OF MARKER N.7545 SITUATED IN THE CAGLIARI ASTRONOMICAL OBSERVATORY FOR THE WEGENER/MEDLAS PROJECT
No full textIn order to check the stability of the slope on which the Cagliari Astronomical Observatory is situated, local network consisting of six vertices, indicated in the field by concrete stakes, was set up.
All stakes are equipped with a forced centering device for measuring instruments consisting of a GPS for positioning of the points by means of satellite measurements and theodolites with geodimeters for positioning the same points with traditional geodetic measurements.
The redundancy of measurements allows both calculation and adjustment by least squares method of the evaluation, by comparision, of the precision obtained in the distance measurements with GPS receivers
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
RILIEVO GPS DELLA RETE DI CONTROLLO DELLA STAZIONE SLR DELL'OSSERVATORIO ASTRONOMICO DI CAGLIARI - POGGIO DEI PINI: CONFRONTO FRA LE LEVATE 1989-1990
No full textAppropriate 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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