Results 11 to 20 of about 3,962,691 (257)
Cet article présente une méthode de visualisation d'une pile temporelle d'images SAR, appelée REACTIV, qui permet de faire ressortir en couleur les zones ayant subi des changements sur la période de temps observée.
Elise KOENIGUER +4 more
doaj +1 more source
Mapping the density of giant trees in the Amazon. [PDF]
Summary Tall trees (height ≥ 60 m) are keystone elements of tropical forests, strongly influencing biodiversity, carbon storage, and ecosystem resilience. Yet, their density and spatial distribution remain poorly quantified, especially in remote Amazonian regions, limiting our understanding of their ecological roles and contribution to forest–climate ...
de Lima RB +20 more
europepmc +2 more sources
Spatial distribution of an eel population (Anguilla anguilla L.) in a small coastal catchments of northern Brittany (France). Consequences hydraulic works. [PDF]
The Frémur is a 60 km2 catchment of Brittany where many hydraulic works (dams, weirs, gauging structures, etc.) have reduced the recruitment by elvers and glass eels since at least 50 years.
Acou, Anthony +4 more
core +3 more sources
Ce travail marque une première étape dans la définition d'une méthode de correction du flou de mouvement observé dans les clichés pris avec un long temps d'exposition par un véhicule de cartographie mobile.
Vincent Daval +2 more
doaj +1 more source
L’autocorrélation spatiale et les données de santé : une étude préliminaire [PDF]
L'analyse de l'autocorrélation spatiale cherche à mesurer jusqu'à quel point la variation dans un ensemble de données réparties dans l'espace est due aux relations decontiguïté.
Bouchard, Diana C.
core +1 more source
Spatial variations of fundamental constants [PDF]
We show that observational limits on the possible time variation of constants of Nature are significantly affected by allowing for both space and time variation. Bekenstein's generalisation of Maxwell's equations to allow for cosmological variation of $alpha$ is investigated in a universe containing spherically symmetric inhomogeneities.
Barrow, John D., O'Toole, Chris
openaire +2 more sources
Located south-west of the Senegalese coast, the mouth of the Casamance River is under the influence of natural hydrodynamic factors. Thus, the beaches of the villages located around this mouth are characterized by a highly variable mobility.
Mamadou Thior +6 more
semanticscholar +1 more source
Les populations de truite (Salmo trutta, L.) et de saumon (Salmo salar, L.) des cours d'eau sont caractérisées par des variations spatiales et temporelles.
MILNER N. J. +3 more
doaj +1 more source
Cet article explore les potentialités des images satellites Pléiades pour l'étude multi-temporelle des marges fluviales fréquemment inondées afin d'évaluer leur diversité d'habitats.
Vincent Wawrzyniak +5 more
doaj +1 more source
Variational principlesvs. Spatial homogeneity
In this paper the homogeneity ansatz is imposed at the level of Einstein's equations and/or at the level of the action. The commutativity of these operations, as far as the resulting equations are concerned, is reinvestigated. The main result obtained is that, when the restrictions imposed by the isometry group are supplemented by the restrictions on ...
CHRISTODOULAKIS, T, KORFIATIS, E
openaire +2 more sources

