1,721,018 research outputs found
Coupling SAR X-band and optical data for NDVI retrieval: model calibration and validation on two test areas
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Mapping evapotranspiration on vineyards: a comparison between Penman-Monteith and energy balance approaches for operational purposes
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Automatic detection and agronomic characterization of olive groves using high-resolution imagery and LIDAR data
Full text linkThe Common Agricultural Policy of the European Union grants subsidies for olive production. Areas of intensified olive
farming will be of major importance for the increasing demand for oil production of the next decades, and countries with
a high ratio of intensively and super-intensively managed olive groves will be more competitive than others, since they
are able to reduce production costs.
It can be estimated that about 25-40% of the Sicilian oliviculture must be defined as “marginal”. Modern olive
cultivation systems, which permit the mechanization of pruning and harvest operations, are limited.
Agronomists, landscape planners, policy decision-makers and other professionals have a growing need for accurate and
cost-effective information on land use in general and agronomic parameters in the particular. The availability of high
spatial resolution imagery has enabled researchers to propose analysis tools on agricultural parcel and tree level.
In our study, we test the performance of WorldView-2 imagery relative to the detection of olive groves and the
delineation of olive tree crowns, using an object-oriented approach of image classification in combined use with LIDAR
data.
We selected two sites, which differ in their environmental conditions and in their agronomic parameters of olive grove
cultivation. The main advantage of the proposed methodology is the low necessary quantity of data input and its
automatibility. However, it should be applied in other study areas to test if the good results of accuracy assessment can
be confirmed.
Data extracted by the proposed methodology can be used as input data for decision-making support systems for olive
grove management
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
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