Laurent Durieux

Institute of Research for Development | IRD · 228 - Space for Development (ESPACE-DEV)

Introdução: A malária é uma doença infecciosa de alta transmissão na região amazônica, porém sua dinâmica e distribuição espacial podem variar, dependendo da interação de fatores ambientais, socioculturais, econômicos e políticos e serviços de saúde. Objetivo: Verificar a existência de padrões de casos de malária em consonância com os regimes fluv...

Diarrhea constitutes a major public health problem in Brazil and in the world and its seasonal dynamics of occurrence is associated with environmental conditions, such as climate-related factors. This research studied the temporal pattern of hospitalizations motivated by diarrhea and gastroenteritis with presumed infectious origin (DGOIP) in 27 Bra...

The development of new sensors and easier access to remote sensing data are significantly transforming both the theory and practice of remote sensing. Although data-driven approaches based on innovative algorithms and enhanced computing capacities are gaining importance to process big Earth Observation data, the development of knowledge-driven appr...

Today civil society have new expectations: scientists must not only measure risks and suggest solutions of mitigation or adaptation, but they also have to monitor and report changes in order to facilitate public decision. Reporting global change nowadays is based on indicators. The main challenge is to find synthetic, and valid indicators for time...

Today civil society have new expectations: scientists must not only measure risks and suggest solutions of mitigation or adaptation, but they also have to monitor and report changes in order to facilitate public decision. Reporting global change nowadays is based on indicators. The main challenge is to find synthetic, and valid indicators for time...

This article presents a discussion of the issues inherent in the decisions that interfere with environmental sustainability and the health of populations across the impact with the implementation of hydropower in the Brazilian Amazon. From the case of the Belo Monte hydroelectric dam, one can observe how the process of environmental licensing in Br...

This article presents a discussion of the issues inherent in the decisions that interfere with environmental sustainability and the health of populations across the impact with the implementation of hydropower in the Brazilian Amazon. From the case of the Belo Monte hydroelectric dam, one can observe how the process of environmental licensing in Br...

O presente artigo apresenta uma discussão sobre as questões intrínsecas às tomadas de decisão que interferem na sustentabilidade socioambiental e na saúde das populações frente aos impactos com a implantação de hidrelétricas na Amazônia brasileira. A partir do caso da hidrelétrica de Belo Monte, pode-se observar como os processos de licenciamento a...

Earth Observation data is of great interest for a wide spectrum of scientific domain applications. An enhanced access to remote sensing images for “domain” experts thus represents a great advance since it allows users to interpret remote sensing images based on their domain expert knowledge. However, such an advantage can also turn into a major lim...

The Epidemiological Surveillance System for Malaria (SIVEP-Malaria) is the Brazilian governmental program that registers all information about compulsory reporting of detected cases of malaria by all medical units and medical practitioners. The objective of this study is to point out the main sources of errors in the SIVEP-Malaria database by apply...

The current Amazon landscape consists of heterogeneous mosaics formed by interactions between the original forest and productive activities. Recognizing and quantifying the characteristics of these landscapes is essential for understanding agricultural production chains, assessing the impact of policies, and in planning future actions. Our main obj...

Understanding spatial patterns of land use and land cover is essential for studies addressing biodiversity, climate change and environmental modeling as well as for the design and monitoring of land use policies. The aim of this study was to create a detailed map of land use land cover of the deforested areas of the Brazilian Legal Amazon up to 200...

Résumé Le principal défi que l’Océanie doit relever en matière de développement durable est de dépasser l’échelle locale pour construire une politique pensée à l’échelle nationale, ce qui implique de concilier la préservation des écosystèmes, des sociétés et cultures qui, d’une manière générale, sont en bien meilleur état que dans d’autres régions...

Cet article présente l'intérêt et la méthodologie de construction d'un site sentinelle sur la zone transfrontalière entre la Guyane française et l'Amapá (Brésil), pour la caractérisation et le suivi de l'impact des processus environnementaux, climatiques et socio-démographiques sur le paludisme. Nous présentons et discutons les concepts de site sen...

This work comprises a spatial, temporal and statistical analysis of the epidemiology of malaria occurrence in four municipalities of the State of Amazonas, Brazil: Coari, Codajás, Manacapuru and Manaus, for the period 2003–2009. The number of malaria cases, precipitation, water level and temperature data were analysed in this study. The strength of...

Geographic Object-Based Image Analysis (GEOBIA) represents the most innovative new trend for processing remote sensing images that has appeared during the last decade. However, its application is mainly based on expert knowledge, which consequently highlights important scientific issues with respect to the robustness of the methods applied in GEOBI...

The rapid and efficient detection of illicit drug cultivation, such as that of Cannabis sativa , is important in reducing consumption. The objective of this study was to identify potential sites of illicit C. sativa plantations located in the semi-arid, southern part of Pernambuco State, Brazil. The study was conducted using an object-based image a...

Cannabis sativa is the most highly demanded illegal drug in the world, even more than amphetamines, cocaine and opiates. In Brazil, one of the strategies to reduce its consumption is the identification and destruction of cultivation. Plantations are identified visually by experienced Brazilian Federal Police agents using helicopters. This study ana...

Cannabis sativa is the most highly demanded illegal drug in the world, even more than amphetamines, cocaine and opiates. In Brazil, one of the strategies to reduce its consumption is the identification and destruction of cultivation. Plantations are identified visually by experienced Brazilian Federal Police agents using helicopters. This study ana...

Boreal forests and wetlands play an important role in the climate system, in particular through biosphere-atmosphere flux exchanges. They are an important pool of carbon and their role as sink or source of greenhouse gases is not fully understood. Accurate mapping of the vegetation of Siberia can therefore contribute to a better understanding of th...

Deliverable 5.2 (D5.2), entitled “Habitat Maps from Very High Resolution (VHR) imagery” is a deliverable of WP5 and focuses on the production of Food and Agricultural Organisation (FAO) Land Cover Classification Systems (LCCS) maps from very high resolution (VHR) spaceborne optical remote sensing data, primarily Worldview and Quickbird, and their t...

Agriculture in Brazilian Amazonia is going through a period of intensification. Crop mapping is important in understanding the way this intensification is occurring and the impact it is having. Two successive classifications based on MODIS (MODerate Resolution Imaging Spectroradiometer)-TERRA/EVI (Enhanced Vegetation Index) time series are applied...

D5.1, titled Habitat Maps is the first deliverable of WP5 and focuses on habitat mapping in continuity with WP6 D6.10 (Software for Habitat Maps Production from Land Cover/Use (LC/LU) Classes). D5.1 includes: o An introduction to semantic nets as the framework to describe LC/LU and GHC classes of interest to the project. o Two case studies with the...

D5.1, titled Habitat Maps is the first deliverable of WP5 and focuses on habitat mapping in continuity with WP6 D6.10 (Software for Habitat Maps Production from Land Cover/Use (LC/LU) Classes). D5.1 includes: o An introduction to semantic nets as the framework to describe LC/LU and GHC classes of interest to the project. o Two case studies with the...

Dans un contexte d'erosion globale de la biodiversite mondiale, la planification de la conservation vise a identifier des aires prioritaires pour les actions de conservation in situ. Cet article propose une synthese historique et methodologique de la planification de la conservation depuis les approches ad hoc jusqu'au Systematic Conservation Plann...

The transformation of forest into pastures in the Brazilian Amazon leads to significant consequences to climate at local scale. In the region of Alta Floresta (Mato Grosso, Brazil), deforestation has been intense with over half the forests being cut since 1970. This article first examines the evolution of precipitation observed in this region and s...

In Part I of this paper, an operational fully automated Landsat-like image spectral rule-based decision-tree classifier (LSRC), suitable for mapping radiometrically calibrated seven-band Landsat-4/-5 Thematic Mapper (TM) and Landsat-7 Enhanced TM+ (ETM+) spaceborne images [eventually synthesized from the Advanced Spaceborne Thermal Emission and Ref...

In our two-part paper (this issue, pp. 1299-1354), there are two errors which we correct here. The corrected text is presented here.

A global systematic sampling scheme has been developed by the UN FAO and the EC TREES project to estimate rates of deforestation at global or continental levels at intervals of 5 to 10 years. This global scheme can be intensified to produce results at the national level. In this paper, using surrogate observations, we compare the deforestation esti...

The extent of wetland areas, and the spatial and temporal variability of wetland inundation, are important components of global biogeochemical and hydrological cycles. Satellite-measured continental water storage variations suggest the importance of the surface waters component in seasonal dynamics of the hydrologic cycle of large tropical river ba...

The new SPOT/Envisat direct receiving station (DRS) operating in Cayenne in the framework of the SEAS-Guyane project was used to produce a global cloudless SPOT mosaic over French Guiana for the year 2006. This mosaic was used to perform a land-use, land-use change and forestry (LULUCF) inventory in the framework of the Kyoto Protocol. Nearly 17 00...

Over the last century, island biodiversity has become one of the most threatened in the world. Although many island conservation plans address biodiversity requirements at the species level, few plans address the spatial requirements of the biodiversity processes that underpin the persistence of these species. Using systematic conservation planning...

Climate changes are altering patterns of temperature and precipitation, potentially affecting regions of malaria transmission. We show that areas of the Amazon Basin with few wetlands show a variable relationship between precipitation and malaria, while areas with extensive wetlands show a negative relationship with malaria incidence.

O sensoriamento remoto participa de maneira estratégica no monitoramento das mudanças de ocupação do solo, da dinâmica da vegetação, da dinâmica hidrológica continental e da variabilidade das temperaturas de superfície dos oceanos. Permite medidas de biomassa, de atividade clorofila, de temperatura de superfície, de altura das águas e de fragmentaç...

Object-based image analysis has been proposed as an efficient approach to handle the multiscale, hierarchical and non-linear complexity of land cover mapping from remote sensing images. It incorporates a first segmentation step that provides image-objects composed of spectrally homogeneous and spatially neighbored clustered pixels. Image-objects be...

The World Health Organization, estimates that 42% of malaria cases are associated with policies and practices regarding land use, deforestation, water resource management, settlement siting and modified house design. This estimate was drawn from expert opinion and studies performed at small scales, but little research has investigated the cumulativ...

O presente relatório faz um relato informal das experiências, impressões e percepções do campo realizado pelos estudantes do CDS/UnB, em conjunto a equipe de pesquisadores e estudantes do projeto Duramaz e do IRD entre os dias 01 e 28 de julho de 2008.

Object-based methods for image analysis have the advantage of incorporating spatial context and mutual relationships between objects. Few studies have explored the application of object-based approaches to mangrove mapping. This research applied an object-based method to SPOT XS data to map the land cover in the mangrove ecosystem of Low Casamance,...

Urban sprawl has been identified as one of the most negative effects of global population growth on the environment and biodiversity. Frequent monitoring of urban sprawl is needed to limit the impact of this ongoing phenomenon. This paper proposes precise monitoring of building construction using an object-based classification methodology applied t...

The transformation of the forest into pastures in the Brazilian Amazon leads to significative climatic consequences at a local scale. This paper proposes to compare the temperatures observed between 2006 and 2007 using local measurements in the area of Alta Floresta (Mato Grosso, Brazil) between a cleared sector and a forested one located in a rese...