Search results for "COUV"
showing 10 items of 86 documents
Topographic descriptors and thermal inversions amid the plateaus and mountains of the Jura (France)
2018
Sixteen temperature measurement sites under forest cover are distributed across the plateaus and mountains of the Jura (France). They are composed of pairs of stations located, one at the bottom of a topographic trough, the other at least 50 m higher in altitude. Three descriptors (station elevation, altitudinal difference (amplitude) between the two stations of each site, and topographical context) are used to explain how the frequency, intensity, and duration of inversions are spatially structured. Depending on whether one considers: 1) tn (minimum temperature) or tx (maximum temperature), 2) frequency or intensity, the sign of the correlation values changes. This reflects the fact that n…
sPlotOpen – An environmentally balanced, open‐access, global dataset of vegetation plots
2021
Datos disponibles en https://github.com/fmsabatini/sPlotOpen_Code
Vegetation structure and greenness in Central Africa from Modis multi-temporal data.
2013
African forests within the Congo Basin are generally mapped at regional scale as broad-leaved evergreen forests, with a main distinction between terra-firme and swamp forests types. At the same time, commercial forest inventories, as well as national maps, have highlighted a strong spatial heterogeneity of forest types. A detailed vegetation map generated using consistent methods is needed to inform decision makers about spatial forest organisation and theirs relationships with environmental drivers in the context of global change. We propose a multi-temporal remotely sensed data approach to characterize vegetation types using vegetation index annual profiles. The classifications identified…
LATIN AMERICA AND ABYA YALA IN TEACHING SPANISH HISTORY: THE "DISCOVERY", THE CONQUEST AND CONTROVERSIES OF THE BLACK LEGEND
2019
RESUMO O trabalho explicita as representações contemporâneas da História da América no ensino de História na Espanha. Explicita e problematiza as configurações textuais e iconográficas que pretendem ensinar uma história do “descobrimento”, da conquista e da colonização da América. Usou-se a metodologia da pesquisa bibliográfica e de campo, com técnica de fichamento e observações analíticas de obras historiográficas contemporâneas, livros didáticos e lugares de memória (museus e monumentos históricos). Em relação aos manuais didáticos, foram selecionados e analisados 18 livros de ensino de História editados por seis editoras no período de 2000 a 2015. Analisou-se a história do “descobrimento…
GEOV1: LAI, FAPAR essential climate variables and FCOVER global time series capitalizing over existing products. Part 2: Validation and intercomparis…
2013
International audience; This paper describes the scientific validation of the first version of global biophysical products (i.e., leaf area index, fraction of absorbed photosynthetically active radiation and fraction of vegetation cover), namely GEOV1, developed in the framework of the geoland-2/BioPar core mapping service at 1 km spatial resolution and 10-days temporal frequency. The strategy follows the recommendations of the CEOS/WGCV Land Product Validation for LAI global products validation. Several criteria of performance were evaluated, including continuity, spatial and temporal consistency, dynamic range of retrievals, statistical analysis per biome type, precision and accuracy. The…
Radiative surface temperature and convective flux calculation over crop canopies
1988
The analysis presented in this paper aims at a better understanding of the potential role of radiative temperature, as measured by a radiometer over crops, in sensible heat flux calculation. Defining radiative temperature as the mean temperature of the surfaces viewed by the radiometer (leaves and soil surface) and assuming that an Ohm's law type formula can be used to express sensible heat flux as a function of the difference between air temperature and radiative temperature, the aerodynamic resistance which divides this temperature difference has been analytically defined. The parameters which appear in the resistance expression depend essentially on wind velocity and canopy structure but…
Un bastion de la résistance aux IFRS, la macro-couverture
2016
The lingering memory of the opposition within the EU to the endorsement of IAS 39 is still very much alive, and the so - called “carve out” standard is a daily remembrance of this fact . It is most commonly associated with the widespread use, within this standard, of the fair - value. This presentation aims at studying another battlefield, the banking practice of macro - hedging and the way French banks are still accounting for it. To This topic will be dealt with through the economic models at stake and their impact on the financial statements, in order to observe how an entity may, or may not, account for this specific activity.
Les climats régionaux : observation et modélisation : actes du colloque
2012
6 pages; International audience; L'objectif de cette étude est de caractériser les variations spatio-temporelles des flux sédimentaires de la basse vallée du Mono-Couffo (bassin versant partagé par le Bénin et le Togo), à partir des données de matières en suspension (MES), de débits solides (TSS), de pluie, du débit et des données concernant l'occupation du sol pour mieux apprécier l'impact de la dégradation du couvert végétal sur le flux des sédiments terrigènes. Il ressort de l'analyse une diminution de plus de 60 % des formations naturelles entre les années 1956 et 2000, contribuant à une augmentation des apports spécifiques dans la basse vallée. Une charge solide considérable en matière…
Optimization of flat area coverage under connectivity constraint in wireless sensor networks
2022
A wireless sensor network consists of a set of small autonomous units that interact via a network built by their communication modules. They observe their environment, capture information, then manage this information according to their computing and/or storage capacity. To effectively accomplish their task(s), they need to cover as much of the area of interest as possible. It is therefore essential to quantify the quality of their coverage. In this thesis, we therefore seek to best cover an area of interest, with a precise number of sensors. While taking into account the possible overlaps between sensors, we first deploy in a zone of regular dimensions and evaluate the exact coverage using…
L’agroforesterie, le futur de la viticulture ?
2020
L’agroforesterie est l’association sur une même parcelle d’une végétation arborée et/ou arbustive, et d’une production végétale, animale ou mixte. Les espèces ligneuses peuvent être réparties uniformément, inégalement ou en bordure de parcelle. Les systèmes agroforestiers fournissent des services écosystémiques et des produits et ce à différentes échelles ; parcelle, exploitation agricole, unité paysagère » (RRAF, 2018). La productivité de ces systèmes dépend de la différence nette entre les avantages et les coûts, entre les utilisations et les composantes biophysiques de l’agroenvironnement. Dans les systèmes de cultures intercalaires, les avantages des arbres sont à la fois économiques et…