1,720,965 research outputs found
Analysis of High Resolution Digital Terrain Model for Morphometric Parameters Extraction and Classification
No full textAnalysis of High Resolution Digital Terrain Model for Morphometric Parameters Extraction and Classification
No full textAnalysis of High Resolution Digital Terrain Model for Morphometric Parameters Extraction and Classification.
No full textApplication of morphometric analysist to Vulcano islan
Tool For Spatial Data Exploitation: Vulcano Island.
No full textDevolopment and application of remote sensing methods for the monitoring of active Italian volcanoe
A Tool for Spatial Data Exploitation Vulcano Island.
No full textIn the framework of the research activities
devoted to monitoring deformation phenomena,
photogrammetric surveys at 1:5.000-
1:10000 scale were carried out on Vulcano
Island in 1993, 1996 and 2001. Large scale
digital map products (Digital Elevation
Models and orthophotos) were extracted to be
used for multi-temporal analysis of morphological
changes occurred in the past. In order
to display, query, summarize and organize data
the collected spatial and image data, a software
dedicated to georeferenced data management
(ELA) was developed. The ELA
Software and a collection of raster and vector
data related to Vulcano Island (included in a
CD-ROM available to the research community)
are described in this wor
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
DEM extraction with digital photogrammetric tecniques: examples of landslides monitoring and applications on volcanic areas
No full textDigital Photogrammetry represents one of the most powerful tool for acquiring, through semi-automatic procedures, a large amount of 3D points for the generation of high spatial resolution Digital Elevation Models (DEM) and the relative rectified images.
DEMs are regular or irregular planimetric grid points with associated elevation values: they are three-dimensional ground surface digital reconstructions. Digital models can be obtained by means of several geodetic techniques like digital aerial and terrestrial photogrammetry, airborne and terrestrial laser scanning, SAR satellite interferometry and GPS kinematic. DEMs internal precisions are strictly related to the selected surveying method, to the operative working conditions and to morphological features of the studied area.
The digital approach for measurement of points from photogrammetric stereopairs make use of image correlation processes which are based on well defined shape comparison techniques or on the grey level distribution in the corrisponding zones of the images.
The precision of a photogrammetric DEM depends on the morphology of the terrain, on the inclination, on the images quality, on the presence of break-lines and vegetation, on the resolution at ground (and therefore on the scale of aerial photograph and pixel dimension), on the ratio between the distance (camera-terrain) and the base (distance between the two acquisition points).
3D data derived by digital photogrammetric processing have recently demonstrated remarkable potentialities for the study of landslides and volcanic areas; models generated at different epochs can be differenced in order to determine displacements and large morphological variation
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