Geographical Information Science, Geomatics, Spatial Analysis


Communication Network Systems for White Spot Areas

Madoune Seye ; Moussa Diallo ; Bamba Gueye ; Christophe Cambier.
White spot areas depict geographic locations which are not covered by mobile network operators. In Senegal, the Sylvo-pastoral hosted by Ferlo's region has a prominent role according to livestock transhumance. Nevertheless, this region is roughly covered by white spot areas. The lack of cellular network infrastructure is a pitfall for vital information dissemination for agro-pastoralists. Therefore, this paper describes the deployment and testbed performance evaluation in rural and urban environment of a LoRa-based COWShED communication architecture. By leveraging a mesh-based prof-of-concept, tangible results are obtained and thus promote several applications which overcome white spot areas limitations such as stakeholders geolocation, transhumance management, milk collection, etc.

Suivi de la sécurité alimentaire en Afrique de l'Ouest : Quelles méthodes d'analyse de données pour traiter l'interdisciplinarité de la sécurité alimentaire

Hugo Deléglise ; Agnès Bégué ; Roberto Interdonato ; Elodie Maitre D'hotel ; Maguelonne Teisseire.

When and how to fallow: first steps towards banana crop yield improvement through optimal and sustainable control of a soilborne pest

Israël Tankam Chedjou ; Frédéric Grognard ; Jean-Jules Tewa ; Suzanne Touzeau.
The main hindrance to banana crop yields is the burrowing nematode Radopholus similis, a microscopic worm that feeds and develops in plant roots. R. similis is an obligatory parasite that fortunately resists badly in the absence of its host. Hence, the deployment of fallows is an efficient way to keep its populations low enough in the soil to have good economic returns on banana bunches. The banana plant is a perennial plant which reproduces itself by budding from its roots, but after a fallow period, a nematode-free sucker needs to be planted to provide for the next cropping season. Fallow is a recommended cropping practice to reduce nematode infestation, but it comes at the cost of nematode-free suckers. Moreover, fallows reduce the time devoted to growing bananas on a given time horizon and may reduce the total yield. A trade-off should then be found between fallow deployment to reduce pest infestation and economic returns. The questions that emerge are when to leave room for the natural reproduction of the banana plant, and when to deploy the fallow? How long to deploy the fallow if applicable? On the basis of mathematical models this paper attempts to answer the questions.

CoLAB, un laboratoire de collaboration multi-acteurs pour l'innovation responsable au service de l'agriculture et de l'alimentation durable

Mamba Souare ; Djamila Oumouri.
Alors que l'agriculture représente près de 15% du PIB total en Afrique subsaharienne et que le secteur agricole constitue le premier pourvoyeur d'emploi, ce dernier ne parvient pourtant pas à relever le défi de la sécurité alimentaire. Or, des initiatives locales pour répondre à ces défis ne manquent pas, mais ces dernières peinent à se pérenniser et à passer à l'échelle. La création de synergies et une mise en commun des savoirs apparaissent comme des moyens pour l'atteinte des Objectifs de Développement Durable 2 (Faim Zéro) et 12 (Consommation et Production Durable). Cet article revient sur le programme CoLAB conçu pour accompagner l'émergence de collaborations pour la résolution des enjeux de sécurité alimentaire en Afrique de l'Ouest.