Louise Leroux

Louise Leroux
International Institute of Tropical Agriculture | IITA

PhD at CIRAD
Remote sensing scientist - Tropical Agriculture - Seconded to IITA (Kenya)

About

57
Publications
26,728
Reads
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557
Citations
Citations since 2016
49 Research Items
539 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Additional affiliations
September 2017 - present
Cirad - La recherche agronomique pour le développement
Position
  • Researcher
December 2015 - September 2017
Cirad - La recherche agronomique pour le développement
Position
  • Researcher
January 2013 - December 2015
Cirad - La recherche agronomique pour le développement
Position
  • PhD Student
Education
September 2011 - September 2012
Agrocampus Ouest
Field of study
  • Remote Sensing and Geography
September 2010 - September 2011
Université de Rennes 2
Field of study
  • Remote Sensing - Geography

Publications

Publications (57)
Article
Full-text available
Accurate cropland maps at the global and local scales are crucial for scientists, government and nongovernment agencies, farmers and other stakeholders, particularly in food-insecure regions, such as Sub-Saharan Africa. In this study, we aim to qualify the crop classes of the MODIS Land Cover Product (LCP) in Sub-Saharan Africa using FAO (Food and...
Conference Paper
Full-text available
In West Africa, the spatiotemporal variability of rainfall is often considered as one of the most important causes of food insecurity. Satellite Rainfall Estimates products provide synoptic, objective and timely information on the rainfall distribution and thus are particularly relevant tools for crop monitoring over large areas. This study assesse...
Article
For the semiarid Sahelian region, climate variability is one of the most important risks of food insecurity. Field experimentations as well as crop modeling are helpful tools for the monitoring and the understanding of yields at local scale. However, extrapolation of these methods at a regional scale remains a demanding task. Remote sensing observa...
Technical Report
Full-text available
Ce rapport a pour objectif de faire un état des lieux des usages des technologies satellitaires dans le développement et l’analyse des agricultures africaines, afin de mieux cerner les difficultés actuelles, identifier les contraintes sur lesquelles la recherche et le partenariat peuvent avoir un effet, et imaginer les actions nécessaires pour leve...
Article
Green manure can be a source of nutrients for crops to spare some of the mineral fertilizer required for sustainable intensification of agriculture in smallholder context. We explored with a calibrated model the potential of legume green manure to help spare mineral fertilizer for sustainable intensification of rainfed rice production in Madagascar...
Article
Full-text available
Around the world, SDMs have been widely used to support forest management planning and biodiversity conservation. Beyond the prediction of species distribution provided by the SDMs, this study aimed to analyze the spatial distribution of tree species diversity using SDMs. The study area is a Faidherbia albida parkland in Central Senegal. It is char...
Article
Full-text available
Strengthening of feed security in the Sahel is urgently needed given the climate change and growing human population. A prerequisite to this is sustainable use of rangeland forage resources for livestock. Many studies have focused on the assessment of rangeland resources during the rainy season, while only a few have focused on the dry season which...
Article
Agroforestry systems are an integral part of Sub-Saharan agricultural landscapes. Studies conducted at tree or plot scales on the supply of ecosystem services (ES) suggest that agroforestry practices are a promising way to build multifunctional agricultural landscapes. However, the current characterization and understanding of how multiple ES are a...
Chapter
Full-text available
This chapter deals with two major issues rural households face in tropical areas: preserving natural resources and guaranteeing food security. Tackling these two challenges simultaneously may require developing profitable production systems that can both guarantee food security for farmers, while also ensuring sustainable management of natural reso...
Article
CONTEXT: Fostering diversity within agricultural systems can substantially contribute to improved food security among smallholder farmers. Agroforestry parklands are diverse agricultural landscapes where trees can provide an array of ecosystem services. Previous studies analyzing the agricultural landscape diversity-food security nexus in agrofores...
Article
Full-text available
Multipurpose Faidherbia albida trees represent a vital component of agroforestry park-lands in West Africa as they provide resources (fodder for livestock, fruits and firewood) and support water lifting and nutrient recycling for cropping. Faidherbia albida trees are characterized by their inverse phenology, growing leaf flowers and pods during the...
Article
Full-text available
The availability of crop type reference datasets for satellite image classification is very limited for complex agricultural systems as observed in developing and emerging countries. Indeed, agricultural land use is very dynamic, agricultural censuses are often poorly georeferenced and crop types are difficult to interpret directly from satellite i...
Article
Full-text available
The phytomass of herbaceous and woody plants is the main source of feed for pastoral livestock in the Sahelian savanna. The assessment of the available feedstock plays a key role in national livestock policies and generally requires many field measurements of both herbaceous and woody plants. In this study, we tested the possibility of using a red-...
Article
Full-text available
In Sub-Saharan Africa, smallholder farms play a key role in agriculture, occupyingmost of the agricultural land. Design policies for increasing smallholder productivityremains a safe way to establish sustainable food systems and boost local economies.However, efforts are still needed in order to achieve accurate and timely monitor-ing in smallholde...
Article
Full-text available
Agroforestry plays a pivotal role for Sahelian communities by allowing simultaneous improvement of food security and conservation of natural ecosystems and their biodiversity. However, agroforestry systems (AFSs) are particularly heterogeneous in sub-Saharan Africa due to small to very small fields, a large variety of agricultural practices and a d...
Preprint
Full-text available
The availability of crop type reference datasets for satellite image classification is very limited for complex agricultural systems as observed in developing and emerging countries. Indeed, agricultural land use is very dynamic, agricultural census are often poorly georeferenced, and crop types are difficult to photo-interpret directly from satell...
Article
Full-text available
European satellite missions Sentinel-1 (S1) and Sentinel-2 (S2) provide at high spatial resolution and high revisit time, respectively, radar and optical images that support a wide range of Earth surface monitoring tasks, such as Land Use/Land Cover mapping. A long-standing challenge in the remote sensing community is about how to efficiently explo...
Article
Agroforestry is pointed out by the Intergovernmental Panel on Climate Change report as a key option to respond to climate change and land degradation while simultaneously improving global food security (IPCC, 2019). Faidherbia albida parklands are widespread in Sub-Saharan Africa and provide several ecosystem services to populations, notably an inc...
Article
Full-text available
Smallholder farmers in sub‐Saharan Africa (SSA) currently grow rainfed maize with limited inputs including fertilizer. Climate change may exacerbate current production constraints. Crop models can help quantify the potential impact of climate change on maize yields, but a comprehensive multi‐model assessment of simulation accuracy and uncertainty i...
Article
The trees in agroforestry plots create spatial heterogeneity of high interest for adaptation, mitigation, and the provision of ecosystem services. But to what distance, exactly, from the tree? We tested a novel approach, based upon geostatistics and Unmanned Aerial Vehicle (UAV) sensing, to infer the distance at which a single agroforestry tree aff...
Article
Remote sensing observations such as NDVI trends can provide important insights into past and present states of land condition. However, they do not directly provide comprehensive information about our representation of land degradation and the processes at work. This study aimed to analyze vegetation productivity underlying factors in order to asse...
Article
Full-text available
In the last decade, governments, international institutions, donors, the private sector, etc. have shown a renewed interest in agricultural issues in Sub-Saharan Africa (SSA). This interest came with a strong need for information in countries where the lack of reliable and timely basic information can be a problem. Thanks to its capacity to observe...
Preprint
Full-text available
Nowadays, there is a general agreement on the need to better characterize agricultural monitoring systems in response to the global changes. Timely and accurate land use/land cover mapping can support this vision by providing useful information at fine scale. Here, a deep learning approach is proposed to deal with multi-source land cover mapping at...
Conference Paper
Full-text available
Geospatial information and its derived products, designed to contribute to public agricultural policy making, are not widely used in Africa, and this despite an increase access to satellite imagery and processing tools. This paper is mainly addressed to policy makers concerned by land and agricultural resources management, as a way to show them the...
Conference Paper
Rainfed agriculture on smallholder farms across the tropics is crucial for food security and livelihoods when availability of irrigated land is limited. Coarse-textured soils with low organic carbon and poor inherent fertility prevail in these systems (Tittonell and Giller, 2013). In the absence of sufficiently remunerative market, smallholders can...
Chapter
Full-text available
In the context of a growing population and impacts of climate changes on agricultural lands and food security, improving crop monitoring of smallholder farming systems is crucial to reach the Sustainable Development Goal (SDG) 2 «Zero hunger». There is an increasing scientific interest in understanding the effects of the biodiversity induced by tre...
Preprint
Full-text available
European satellite missions Sentinel-1 (S1) and Sentinel-2 (S2) provide at highspatial resolution and high revisit time, respectively, radar and optical imagesthat support a wide range of Earth surface monitoring tasks such as LandUse/Land Cover mapping. A long-standing challenge in the remote sensingcommunity is about how to efficiently exploit mu...
Article
Full-text available
Background: Vector-borne diseases are among the leading causes of morbidity and mortality in humans and animals. In the Afrotropical region, some are transmitted by Culicoides, such as Akabane, bluetongue, epizootic haemorrhagic fever and African horse sickness viruses. Bluetongue virus infection has an enormous impact on ruminant production, due...
Article
Remote sensing data, crop modelling, and statistical methods are combined in an original method to overcome current limitations of crop yield estimation. It is then tested for timely estimation of maize grain yields and their year-on-year variability in Burkina Faso. Outputs from the SARRA-O crop model were used as a proxy for observed data for cal...
Article
Modern Earth Observation (EO) systems produce huge volumes of images with the objective to monitor Earth surface. Due to the high revisit time of EO systems such the Sentinel-2 constellation, satellite image time series (SITS) are continuously produced allowing to improve the monitoring of spatio-temporal phenomena. How to efficiently analyze SITS...
Conference Paper
Full-text available
In Senegal, areas covered with scattered trees, intentionally selected and preserved by the populations, are dominant features of the landscapes. Numerous studies have highlighted the multifunctionality of these parklands, where people use trees as fodder for herds, as natural fertilizers for crops, and food, wood and pharmaceutical providers for h...
Conference Paper
Full-text available
Characterizing agroforestry systems (AFS) at landscape scale is of a great importance for development planning at regional scale in Africa. Therefore, the major constraint to effective AFS mapping with remote sensing is the high diversity within landscapes. To have a robust and representative sample of training data, this study proposes an optimize...
Conference Paper
In the southern countries, timely and accurate land cover mapping is crucial for food security monitoring. Nowadays, Earth Observation missions like Sentinel-1 (S1) and Sentinel-2 (S2) provide radar and optical imagery respectively, which can be organized in dense time series and leveraged for a wide range of applications such as land cover mapping...
Article
Full-text available
Les informations géospatiales et leurs produits dérivés, conçus pour contribuer à la définition des politiques publiques agricoles, sont peu utilisés en Afrique. Les infrastructures, la formation et les compétences manquent ; les activités de recherche et développement sont dispersées et insuffisantes. Mais, surtout, les besoins restent mal formali...
Article
Full-text available
Geospatial information and its derived products, designed to contribute to public agricultural policy making, are not widely used in Africa. The infrastructure, training and skills are lacking, and research and development activities are dispersed and inadequate. More importantly, needs are not formalised and technological resources, driven by the...
Article
Full-text available
Description of the subject. Climate uncertainty is expected to have a severe impact on the economy of West African countries. The use of forecasting in agricultural production has become a priority for those working in the field of development. This article focuses on the early prediction of cotton production levels before harvesting in Senegal, us...
Chapter
Land cover mapping relies mainly on the classification of satellite images using supervised techniques. The European Space Agency (ESA's) Sentinel-2 (S2) images available since 2015 and providing images at a high temporal and spatial (10 m) resolutions, offer new opportunities for land cover monitoring using remote sensing in Africa. This chapter p...
Chapter
This chapter presents a workflow for publishing maps online using the LizMap solution, using a land cover map over the region of Yilou as a case study. LizMap is a free open-source application that integrates a quantum geographic information system (QGIS) plugin and allows maps to easily be published online. The chapter proposes a general workflow...
Article
Climate change is threatening the ability to grow cotton (Gossypium hirsutum L.) under low input rainfed production areas in Sub-Saharan Africa. In Northern Cameroon, yield has been declining due to unsuitable cropping practices such as sub-optimal planting dates, along with an absence in genetic gain. The aim of this study was to use a cropping sy...
Presentation
Since the Sahelian population livelihood relies mainly on agropastoral activities, accurate information on biomass productivity dynamics and the underlying drivers are needed to manage a wide range of issues such as food security. This study aims to contribute to a better understanding of these drivers in rangeland and cropland, both at the Sahel a...
Article
A wide range of environmental and societal issues such as food security policy implementation requires accurate information on biomass productivity and its underlying drivers at both regional and local scales. While many studies in West Africa are conducted with coarse resolution earth observation data, few have tried to relate vegetation trends to...
Chapter
Full-text available
The territory, defined as a geographical space as appropriated and perceived by individual or collective actors, evolves in space and time under the effects of natural and anthropogenic factors in an institutional, political and social context. It is therefore inherently dynamic. Planning and decision-making for territories consequently require a d...
Poster
Full-text available
Rural areas of West Burkina Faso have seen notable transformations these last two decades due to high population growth and farming systems evolution. Satellite images acquired frequently and covering large areas are essential for detecting such landscape changes and long term trends. However, these images generally have coarse spatial resolutions...
Thesis
The African population is now estimated at 831 million and is projected to reach 3.8 billion in 2100. In addition to those human demography changes, deep-rooted environmental changes and notably climate change will probably negatively affect agricultural production in a region dominated by rainfed farming systems. Consequently, the agricultural pro...
Poster
Full-text available
West Africa has experienced a long lasting, severe drought as from 1970, which seems to be attenuating since 2000. It has induced major changes in living conditions and resources over the region. In the same period, marked changes of land use and land cover have been observed: land clearing for agriculture, growth rates, and ecosystem evolutions dr...
Conference Paper
Full-text available
In West Africa, rainfall variability dynamics are often considered as the major driver of vegetation production. Land use shifts have also to be taken into account when analyzing changes in vegetation production. To study how land use changes may impact vegetation response along a climatic gradient, we used three MODIS NDVI metrics time series (200...
Article
Full-text available
Depuis les trente dernières années, de nombreuses études scientifiques s’intéressent aux dynamiques hydrologiques relevées dans le bassin versant du lac Tchad. En effet, ce bassin versant a été, et est encore, une zone emblématique des impacts du changement climatique sur la ressource en eau en région sub-saharienne. la gestion de cette ressource e...

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Projects (7)
Project
Modern Earth Observation systems provide huge amount of data from different sensors at different temporal, spatial and spectral resolutions. Such amount of information is commonly represented by means of multispectral imagery and, due to its complexity, it requires new techniques and method to be correctly exploited to extract valuable knowledge. The MDL4EO team (Machine and Deep Learning for Earth Observation) at the UMR TETIS (Montpellier, France) has the objective to scientifically contribute to this new era providing AI methods and algorithms to extract valuable knowledge from modern Earth Observation Data. The amount of data being collected by remote sensors is accelerating rapidly and we cannot manage them manually, this is why machine/deep learning lends itself well to remote sensing. More in detail, some of the research questions of the MDL4EO team are the follows: - How to intelligently exploit Time Series of Satellite Images to leverage temporal dynamics - How to combine/fusion together multi spectral/temporal/resolution/sensor information with the objective to add value to the information thanks to the combination of multi source - How to transfer knowledge from different geographical Area: transfer land cover classification model from one site (i.e. France) to another one geographically distant (i.e. Africa). It’s time to fill the gap between Remote Sensing and AI. MDL4EO is working on that direction bringing together different expertises: Data Science, Computer Vision, Machine Learning, Remote Sensing and Geoinformatics.