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Contribution of GIS to the characterization of physiographic parameters of surface runoff control in three sub-watersheds of the Mandara Mountains (Far North Cameroon)<\/strong><\/p>\n HALIMASSIA EMINA (1), KOSSOUMNA LIBA\u2019A Natali (2), GANOTA Boniface (3), BASKA TOUSSIA Daniel Val\u00e9rie (4), DJIBRILLA Paul (5), DZEUFACK DJOUMESSI Ga\u00ebtan Arthur (6)<\/strong><\/em><\/p>\n <\/p>\n 1) Doctorant \/ Universit\u00e9 de Maroua <\/p>\n Abstract.<\/strong> This work shows the potential of geographic information systems (GIS) for the evaluation of the physiographic characteristics which condition the surface flow of three mountain sub-basins namely the SBV of Mayo Mandia and Zamay located on the foothills and the SBV of Moutfoum located on the plateau of a watershed which condition the surface flow. The processing of DTMs from 30 m resolution SRTM images using GIS has led to the extraction of the various sub-basins, the creation and construction of thematic maps and the automatic calculation of a multitude of physiographic parameters (size, shape, slope, drainage density, etc.) for each sub-basin (characteristics of shape, relief, and hydrographic network). The objective of this work is to highlight the weight of these different parameters on the flow of surface water. The correlation between these physiographic variables and some parameters which characterize this flow shows that these steep slopes induce torrential flows with a more moderate runoff speed at the level of the plateau (1.36 m \/ s for the Mayo Moutfoum) and the flows are more intense on the piedmonts of 2.78 m \/ s and 2.11 m \/ s respectively for the Mayo Mandia and the Mayo Zamay. Keywords. GIS, DEM, Physiographic characteristics, watershed, surface runoff<\/strong><\/p>\n <\/p>\n ================================================================<\/p>\n <\/p>\n Geographic Information System and analysis of accessibility to basic social structures in the rural communes of the Bamboutos department (West-Cameroon)<\/strong><\/p>\n YEMELONG TEMGOUA Nadine (1)<\/em><\/strong><\/p>\n <\/p>\n (1) Charg\u00e9e de Cours, \u00c9cole Normale Sup\u00e9rieure, Universit\u00e9 de Bamenda (Nord-Ouest du Cameroun), travail effectu\u00e9 dans le cadre d\u2019un stage \u00e0 l\u2019Universit\u00e9 Libre de Bruxelles (Belgique), Juin-D\u00e9cembre 2018<\/p>\n <\/p>\n Abstract.<\/strong> Dating back to the colonial era, the decentralisation process in Cameroon began to take shape with the constitutional revision of 18 January 1996. In this movement, each council is called upon to gather the necessary tools for its development. However, rural councils are sometimes confronted with several problems, including the lack of tools for managing their infrastructures. This study aims to show how open source GIS can contribute to studying the accessibility of populations to basic social structures related to education, health and potable water. The methodology used is based on the analysis of the distance to the nearest social structure. Spatial and attribute data relating to basic social structures were collected in the councils of Babadjou, Batcham and Galim. The data processing resulted in the creation of distance surface maps around these structures. The results show that, overall, a large majority of the population can access a social structure on foot within one hour, but when other factors such as the type of structure are taken into account, the proportion with access decreases considerably. Because of their efficiency and affordability, open source GIS are positioned as tools to study the accessibility of local populations to social structures. By using these tools, decision-makers will now have the possibility to do better planning in the territories they are responsible for as foreseen in the decentralisation process. Keywords. Geographic Information Systems (GIS), decentralisation, local development, social structures.<\/strong><\/p>\n <\/p>\n ===============================================================<\/p>\n <\/p>\n Drone and quickbird data: What uses for local development planning in Babon\u00e9 (Cameroon)<\/strong><\/p>\n <\/p>\n NDJOUNGUEP Jusacar (1), MEDIEBOU Chindji (1), POUABE Lucien (2)<\/em><\/strong><\/p>\n <\/p>\n (1) G\u00e9ographe, chercheur, Universit\u00e9 de Yaound\u00e9 I <\/p>\n Abstract. <\/strong> Mapping is an indispensable tool in the management and development of the territory. It is a basis for a better dimensioning of works and the facilitation of land allotments in rural areas. The aim of this article is to draw up a map of the state of the land use, equipment and infrastructure. To achieve this, we have proceeded to cross-reference cartographic, photogrammetric, satellite and Ground Control Point (GCP) data in order to propose better decision-making tools. The results show, on the one hand, thematic maps (topographic, land use, infrastructure) produced on the basis of the cross-referencing of the above data. On the other hand, a database of GCPs that have been implemented and observed from Geolocation and Navigation Satellite System (GNSS) receivers. The maps obtained allow the updating of the topographic maps produced in Cameroon in the early 1980s. They allow the design of a database for a better sizing of the infrastructures and the follow-up of the densification of the geodetic network on the territory. Keywords. Drone, Quickbird, rural land, local development, database.<\/strong><\/p>\n <\/p>\n ===============================================================<\/p>\n <\/p>\n Changes in the vegetation cover in the Zamay reserve in the Far North of Cameroon and the role of anthropogenic actions<\/strong><\/p>\n <\/p>\n TSIMI EBOLO Armand (1), Remi JIAGHO (2), ETOUNA Joachim (3), \u00c9ric FOTSING (4)<\/em><\/strong><\/p>\n <\/p>\n (1) Universit\u00e9 de Ngaound\u00e9r\u00e9, Laboratoire de G\u00e9omatique <\/p>\n Abstract. <\/strong> La pr\u00e9sente \u00e9tude pose le probl\u00e8me de l\u2019impact de l\u2019accroissement de la population r\u00e9fugi\u00e9e sur la v\u00e9g\u00e9tation ligneuse de la r\u00e9serve foresti\u00e8re de Zamay. L\u2019objectif principal est d\u2019\u00e9valuer l\u2019impact de l\u2019afflux des r\u00e9fugi\u00e9s sur la dynamique du couvert v\u00e9g\u00e9tal. La d\u00e9marche adopt\u00e9e se fonde sur les observations de terrain, les entretiens aupr\u00e8s des autorit\u00e9s de gestion de la r\u00e9serve ainsi que des chefs traditionnels, et des enqu\u00eates men\u00e9es aupr\u00e8s des populations environnantes. Il s\u2019est aussi agi d\u2019exploiter les images satellitaires en effectuant une classification hi\u00e9rarchis\u00e9e des zones d\u2019occupations. Les r\u00e9sultats issus de cette \u00e9tude montrent qu\u2019entre 2000 et 2013, la for\u00eat a r\u00e9gress\u00e9 de 42,7% \u00e0 29,2% et qu\u2019entre 2013 et 2021, elle a connu une nette progression en passant de 29,2% \u00e0 33,3% de son couvert v\u00e9g\u00e9tal. Les cons\u00e9quences de la perte du couvert forestier observ\u00e9e avant 2003 s’est traduite par l\u2019extension des zones de cultures et les cons\u00e9quences sont d’ordre biophysiques (l\u2019\u00e9rosion hydrique, l\u2019\u00e9rosion \u00e9olienne), et socio-\u00e9conomiques. La reprise observ\u00e9e apr\u00e8s 2013 peut s’expliquer par les actions entreprises pour minimiser la r\u00e9gression du couvert v\u00e9g\u00e9tal \u00e0 savoir : la multiplication des postes d\u2019observations et le recours \u00e0 la surveillance intensive par les gardes forestiers. Pour une gestion plus durable et contr\u00f4l\u00e9e de la r\u00e9serve foresti\u00e8re de Zamay, nous recommandons un zonage de l’espace et l’utilisation de la g\u00e9omatique et en particulier la t\u00e9l\u00e9d\u00e9tection et les SIG pour l’am\u00e9nagement et le suivi continu. Key words. Vegetation cover, refugees, remote sensing, GIS, Zamay.<\/strong><\/p>\n <\/p>\n ===============================================================<\/p>\n <\/p>\n The mapping of shopping in the city of Yaounde<\/strong><\/p>\n <\/p>\n ELOUNA Boris (1), MEDIEBOU CHINDJI (2)<\/em><\/strong><\/p>\n <\/p>\n (1) Master en cartographie, Universit\u00e9 de Yaound\u00e9 I <\/p>\n Abstract. <\/strong> Many urban crises are linked to the difficulty of identifying from a map an urban layout where one can find: the shopping street, the food market, the supermarket sector. The objective of this article is to present the steps of the method used to map the layout of the shoppings of the Yaound\u00e9 Urban Community (CUY). To achieve this, we collected GPS data (geographic coordinates) and photographs, non-spatial data (item references, item prices and gender) in order to process and implement them. The result is a database, a digital shopping mall map and a recommendation system. Thus, the mapping of the urban development of the city of Yaound\u00e9 is necessary based on the tools of Geomatics Cartography, Urban Community, Shoppings, geomatics, city of Yaound\u00e9.<\/strong><\/p>\n <\/p>\n ===============================================================<\/p>\n <\/p>\n D\u00e9veloppement d’une application web cartographique pour l’acc\u00e8s aux informations g\u00e9ospatiales sur le Tourisme au Cameroun<\/strong><\/p>\n <\/p>\n FOTSO Clarice (1), TONGO Landry (1), SENOUA C\u00e9sar (1) et VOURNONE Marcellin (1)<\/em><\/strong><\/p>\n <\/p>\n (1) National institute of cartography, P.O. Box 157 Yaound\u00e9, Cameroon, claricefotso@yahoo.fr<\/p>\n <\/p>\n Abstract. <\/strong> Le Cameroun est connu comme l’Afrique en miniature et a donc un grand potentiel touristique. Vue le faible niveau d’exploitation de cette richesse, l’Etat du Cameroun s’est engag\u00e9 depuis 2010 au r\u00e9am\u00e9nagement des sites, des voies d’acc\u00e8s et des lieux de loisirs. Pour une action efficace et efficiente diffusion de son offre touristique, une application de cartographie web a \u00e9t\u00e9 mise en place en 2012. Cependant, il n’a pas pu \u00eatre publi\u00e9e en raison d’un certain nombre de lacunes, notamment l’utilisation d’une \u00e9chelle mono carte au 1:500 000 et le manque d’interactivit\u00e9 avec la carte. Dans cet article, nous proposons une am\u00e9lioration version de cette application et gr\u00e2ce \u00e0 un processus de d\u00e9veloppement logiciel, une nouvelle plate-forme a \u00e9t\u00e9 impl\u00e9ment\u00e9 et permet sur le fond de carte multi-\u00e9chelle OSM, un acc\u00e8s interactif aux offres touristiques sur Cameroun en fournissant des informations descriptives et des photos illustratives sur demande. Key words. Web mapping, map, tourism, interactivity, Cameroon<\/strong><\/p>\n <\/p>\n ===============================================================<\/p>\n <\/p>\n Applied geographic information systems (GIS) and territorial governance of solid waste: case of the municipality of Saint-Louis in Senegal<\/strong><\/p>\n <\/p>\n SARR Khalifa Ababacar (1)<\/em><\/strong><\/p>\n <\/p>\n (1) CEO http:\/\/iga.sn\/ | Groupe TELOPHASECEO du Cabinet IGA SARL<\/p>\n <\/p>\n Abstract. <\/strong>The city of Saint-Louis is currently confronted with many constraints combined with an amphibious site unfavorable to a large-scale human settlement like an eccentric and landlocked character in the north of the country, economic dynamism hampered by the crisis of its main sector of activity (fishing), particularly degraded urban setting, in particular due to the proliferation of waste, threatened and restrictive natural site. There is a high production of waste in the municipality; 104,866 kg of waste produced per day, i.e. 104.866 tonnes of waste; i.e. 6816.29 tonnes produced per year. The characterization of the waste was carried out in 2014 by the UCG, after finding that most of the waste is made up of fine materials (sand), plastic (light and hard) and organic materials (food residue). The municipality of Saint-Louis has a street sweeping system managed by the municipal authority. The sweeping is done at the level of 22 arteries (streets and avenues) on a linear of 21.778 km. This system has benefited from the support of the Priority Cleanliness Program (3P) of the Waste Management Coordination Unit, in its sustainability phase. We have developed an applied Geographic Information System to better manage the waste collection and management activity. For greater efficiency, it will be necessary to recruit and train three technical agents in the use of this geographical database with spatial reference. Database, Urban Waste, Governance, Saint Louis, Senegal, Geographic Information System.<\/strong><\/p>\n <\/p>\n ===============================================================<\/p>\n <\/p>\n Strat\u00e9gies de gestion du risque d’inondation dans la ville de Diffa (Niger)<\/strong><\/p>\n <\/p>\n KIARI FOUGOU Hadiza (1), DAMBO Lawali (2), LAWANE BOUKAR Mahamadou (3)<\/em><\/strong><\/p>\n <\/p>\n (1) G\u00e9ographe, Enseignante-chercheure, Ma\u00eetre-Assistante \u00e0 l\u2019Universit\u00e9 de Diffa <\/p>\n Abstract. <\/strong> Since the floods of 2012, the city of Diffa has faced the phenomenon of recurrent floods, which is due to the overflows of the Komadougou Yob\u00e9. The objective of this work is to analyze the main factors of this flood and the strategies used to fight against it. Most of the data was collected from official data provided by the technical services, supplemented by field surveys based on individual interviews and surveys by administered questionnaires from heads of household. In this work, the choice of these three districts, namely : Diffa Koura, Sabon Carr\u00e9 and Festival, is explained by the recurrence of the flooding phenomenon. Data collection was carried out with 45 people, including 14 women and 31 men, with a proportion of 31.1% women against 68.9% men. The analysis of the result obtained shows that the overflow of the Komadougou Yob\u00e9 River, the occupation of risk areas by the population, silting, failure to control the flooding of this river upstream (in Nigeria) and climate change are the main factors of the floods recorded in the city of Diffa. The observation and analysis of satellite images, the map of flood-prone areas and risk areas have made it possible to determine the aggravating factors of these floods. The analysis of the topographic profile across, the slope, the degradation of the vegetation cover of the watershed, further indicated the amplifying factors of these floods in the city of Diffa. It was found through this study a gradual increase in the damage and damage caused by the 2019 river flood in Diffa. This negative progression of the damage is explained by the insufficiency of the tools and institutional mechanisms for the prevention and management of floods that the State and its partners should put in place. However, the most used strategy is that of the earthen dyke. Notwithstanding, the solutions provided by local authorities, technical services and development partners for better risk management in the city of Diffa, much effort is still needed. Key words. Komadougou Yob\u00e9, floods, risks, management, strategies, Diffa.<\/strong><\/p>\n <\/p>\n ===============================================================<\/p>\n <\/p>\n From time uncertainties to resilient farming practices in the Sudano-Sahelian zone of Cameroon<\/strong><\/p>\n <\/p>\n FOFIRI NZOSSIE Eric Jo\u00ebl (1), WAKPONOU Anselme (2), TEMPLE Ludovic (3-4)<\/em><\/strong><\/p>\n <\/p>\n (1) Universit\u00e9 de Ngaound\u00e9r\u00e9, D\u00e9partement de G\u00e9ographie \/ Chercheur associ\u00e9 UMR 201 \u00ab\u00a0D\u00e9veloppement & Soci\u00e9t\u00e9s\u00a0\u00bb IRD-IEDES, BP. 320, Yaound\u00e9 (Cameroun) <\/p>\n Abstract. <\/strong> In the Cameroonian Sudano-Sahelian region, the rainfall irregularities, floods and recurrent droughts make agricultural activities more precarious, which is still too much linked to natural data. The aim of this article is to show that in the face of the vicissitudes of climate change, farmers are multiplying new experiences in their daily activities to ensure their survival. These experiments concern the management of runoff water and soil moisture, the selection of varieties and the adoption of crops resistant to water stress, the conquest of new agricultural fronts, the creation and use of artificial ponds reveal the capacity of local societies to cope with climate shocks by going beyond simple adaptation practices to resilient behavior. Keys words: Agriculture, Adaptation, Strategy, resilience, Cameroon.<\/strong><\/p>\n <\/p>\n ===============================================================<\/p>\n <\/p>\n Implementation of spatial data collection mobile digital tool for better management of bertoua urban territory (East-Cameroon)<\/strong><\/p>\n <\/p>\n PETNGA NYAMEN Simon Pierre (1), TALLA TANKAM Narcisse (2), AMOUGOU Jeanne Laure Viviane (3) et LABE YADIA Yveline (3)<\/em><\/strong><\/p>\n <\/p>\n (1) Charg\u00e9 de Cours, Universit\u00e9 de Bertoua, ENS de Bertoua, D\u00e9partement de G\u00e9ographie <\/p>\n Abstract. <\/strong>The issue of local development is closely linked to that of land and estate law, as planning involves land management. Moreover, it has not escaped the Cameroonian legislator that the Decentralized Territorial Collectivities (DTCs) must have secure lands for the realisation of their various planning and development projects. This is the raison why, the laws relating to Regions and Municipalities transfer to them, competences in the field of urban planning, territorial development and urban planning. In addition, these texts define the general framework for the appropriation and\/or use of land belonging to the private estate of the State, the public estate and the national estate. However, the problem is that almost all of Cameroon's DTCs do not have a good command of their entire territory, because they do not have a Geographic Information System (GIS). The areas of competence of these DTCs are therefore poorly known, which hinders the control of local land resources. The current world (21st Century) is resolutely turned towards digital technology, which offers powerful and adequate tools for the management of spatially referenced information. This paper is part of the e-governance issue in Africa, it is a contribution to the improvement of land management of local communities in Cameroon, based on a test carried out in the city of Bertoua. Its main objective is to present the methodological approach used to design and operationalize of a mobile digital tool for the characterisation of urban land for better decision-making. Key words. Mobile tool, Geographic Information System, Decentralized Territorial Collectivities, Land management, Bertoua.<\/strong><\/p>\n <\/p>\n ===============================================================<\/p>\n <\/p>\n Lutte contre la d\u00e9gradation des sols et la d\u00e9sertification dans l’Extr\u00eameNord du Cameroun \u00e0 travers une application web cartographique utilisant des outils opensource<\/strong><\/p>\n <\/p>\n WADOUFEY Abbel (1), MOHAMADOU Yakouda (1), NAMEKONG DAGHA Sinclair (1)<\/em><\/strong><\/p>\n <\/p>\n (1) Research Assistant, National Institute of Cartography, Cameroun<\/p>\n <\/p>\n Abstract. <\/strong> Afin de lutter efficacement contre la d\u00e9gradation des sols et la d\u00e9sertification dans l’Extr\u00eame-Nord du Cameroun, une approche \u00e9cologique appel\u00e9e ReviTec\u00ae a \u00e9t\u00e9 mise en place \u00e0 travers un site exp\u00e9rimental. Les activit\u00e9s de ReviTec n\u00e9cessitent de disposer les informations sur les plantes spatialement reparties dans les sites d\u2019exp\u00e9riences. Au vu de la gestion des donn\u00e9es \u00e0 r\u00e9f\u00e9rence spatiale sur les plantes dans les sites d\u2019exp\u00e9riences, les chercheurs de ReviTec\u00ae se rendent compte de la difficult\u00e9 \u00e0 collecter et \u00e0 analyser ces donn\u00e9es alors qu\u2019elles peuvent provenir de diff\u00e9rentes sources et avoir de formats diff\u00e9rents, ce qui rend cette analyse fastidieuse. Les Syst\u00e8mes d\u2019Information G\u00e9ographique (SIG) tentent de r\u00e9soudre ce probl\u00e8me, en les couplant au WebMapping, ainsi nous pouvons diffuser et manipuler les objets directement sur une carte interactive pour une gestion tr\u00e8s pertinente et efficace des donn\u00e9es g\u00e9ographiques. Notre travail consiste \u00e0 int\u00e9grer et \u00e0 adapter la technologie webmappping dans le syst\u00e8me de monotoring pour le suivi des activit\u00e9s de ReviTec \u00e0 travers des outils Open Source. Key words: ReviTec\u00ae, WebMapping, GIS, spatial data, soil degradation, desertification, information system.<\/strong><\/p>\n <\/p>\n ===============================================================<\/p>\n <\/p>\n A look at the landscape integration process in the new urban centre of Diamniadio in Senegal<\/strong><\/p>\n <\/p>\n BADIANE Sidia Diaouma (1), MBAYE Edm\u00e9e (1)<\/em><\/strong><\/p>\n <\/p>\n (1) Laboratoire de Biog\u00e9ographie, D\u00e9partement de G\u00e9ographie, Universit\u00e9 Cheikh Anta Diop de Dakar<\/p>\n <\/p>\n Abstract. <\/strong> In the context of smart cities, the notion of landscape has a fundamental place. This important dimension has been considered in the planning of the urban pole of Diamniadio. This reflection is thus concerned with the integration of landscape in the planning of the urban pole of Diamniadio. The study was based on a research approach of direct field observation, a survey of actors, and inventories of baobab tree feet as landscape markers. It shows that the landscape is at the heart of the Diamniadio urban centre construction project. The development of this new town is based on planning that highlights the natural assets of the area. The first infrastructure construction works bear witness to this. The ambition of the public authorities is to make Diamniadio an intelligent city by articulating the urban in the natural. This involves preserving green spaces, adapting constructions to the substrate and enhancing wetlands. Keywords. Landscape integration, development, urban pole, Diamniadio, Senegal.<\/strong><\/p>\n ===============================================================<\/p>\n <\/p>\n Phenology of woody species preserved in the savannah and evolution of environments modified by anthropic activity. The example of the savannahs of North-East Ivorian<\/strong><\/p>\n <\/p>\n KAMBIRE Sambi (1)<\/em><\/strong><\/p>\n <\/p>\n (1) Ma\u00eetre-assistant, Universit\u00e9 Peleforo Gon Coulibaly\/Korhogo (C\u00f4te d\u2019Ivoire)<\/p>\n <\/p>\n Abstract. <\/strong> The natural environment of the Sudanese savannahs is characterized by useful protected species of trees, organized in orchards or parks. This woody stand does not strongly dominate the landscape; it adorns. In addition, it is at the origin of many original aspects: in these savannas where the clearings and fires practiced by the man involve a depletion of the flora of origin and a reduction in the fertility of the soil, these species involve modifications remarkable the physiognomy of the different facies of the vegetation by the appearance and the fall of their leaves, flowers and fruits. We can therefore wonder about the role of these phenological modifications in restoring the environments modified by humans. The aim of this work was to understand the phenology of the main woody species spared by the clearing of rural communities and the useful modifications they can make in environments deeply modified by anthropic activity. The phenological stages of these woody species are analyzed on the basis of surveys carried out every two weeks from the start of the dry season (November) to the end of the rainy season (May-June to October). The following results show that their green regrowth, from scattered fruits or roots, allow the woody reconquest of environments abandoned to fallow. Key words. Phenology, useful species of trees, destroyed environments, savannah, North-Eastern C\u00f4te d\u2019Ivoire.<\/strong><\/p>\n ===============================================================<\/p>\n <\/p>\n Un cadre g\u00e9n\u00e9rique orient\u00e9 service pour les applications SIG d\u00e9di\u00e9 \u00e0 la communaut\u00e9 de recherche sur l’utilisation des terres<\/strong><\/p>\n <\/p>\n KAKEU TUEKAM Severin (1), FOTSING Eric (2)<\/em><\/strong><\/p>\n <\/p>\n (1) D\u00e9partement de G\u00e9nie Informatique, LAIA laboratory, Institut Universitaire de Technologie Fotso Victor, Universit\u00e9 de Dschang <\/p>\n Abstract. <\/strong>Avec la disponibilit\u00e9 croissante d’informations g\u00e9or\u00e9f\u00e9renc\u00e9es et d’applications SIG sur le Web, les questions de partage des connaissances dans les activit\u00e9s et services en r\u00e9seau ont suscit\u00e9 un int\u00e9r\u00eat tant dans la recherche sur l’utilisation des terres que dans le monde commercial et universitaire. La communaut\u00e9 de recherche sur l’utilisation des terres comprend des acteurs issus de diverses disciplines formant une communaut\u00e9 de pratique pour partager les pr\u00e9occupations concernant le travail, les probl\u00e8mes et les d\u00e9fis auxquels ils sont confront\u00e9s. Les approches agent-based, intelligence artificielle, math\u00e9matiques et spatiales sont g\u00e9n\u00e9ralement utilis\u00e9es pour proposer des solutions \u00e0 des probl\u00e8mes complexes dans le domaine de l’environnement. Parfois, la diversit\u00e9 des architectures logicielles utilis\u00e9es dans les applications SIG limite l’efficacit\u00e9 du partage des connaissances au sein de la communaut\u00e9. De nos jours, ces applications ne doivent pas se limiter aux processus de stockage et d’affichage, mais elles doivent \u00eatre orient\u00e9es composants et services afin de faciliter le partage de connaissances, de donn\u00e9es et de services entre les outils du domaine ou les acteurs dans divers domaines, y compris les applications de t\u00e9l\u00e9d\u00e9tection, les syst\u00e8mes multi-agents et plateformes Big Data. Dans cet article, nous abordons ce probl\u00e8me en proposant un cadre g\u00e9n\u00e9rique orient\u00e9 services qui aide les d\u00e9veloppeurs \u00e0 cr\u00e9er des applications SIG \u00e0 couplage l\u00e2che et \u00e9volutives plus efficaces. Keywords. Software Architecture, Middleware, GIS Technology, Service, Community of Practice, Land Use.<\/strong><\/p>\n ===============================================================<\/p>\n <\/p>\n Remote sensing, GIS and study of the spatio-temporal dynamics of land use on the landscape of Mount Cameroon, South-West Region Cameroon<\/strong><\/p>\n <\/p>\n MEZAFACK karol L (1), Julius TATA Nfor (1), NGUEFACK Jovis Arnold (1), TIENTCHEU Loic (1)<\/em><\/strong><\/p>\n <\/p>\n (1) Unit\u00e9 de Recherche d\u2019\u00e9tude climatologique Environnementale de l\u2019Universit\u00e9 de Dschang, UCLIREN, D\u00e9partement de G\u00e9ographie-Am\u00e9nagement-Environnement, Universit\u00e9 de Dschang<\/p>\n <\/p>\n Abstract. <\/strong> The landscape of Mount Cameroon is endowed with a tropical volcano covered with a dense forest belt that centuries of human occupations have contributed to shaping. Taking this into account, the main objective of this work is to analyze the spatio-temporal dynamics of land cover and land use in the said area. The diachronic approach was used for the digital processing of satellite images of the period of 1986, 2010 and 2020 according to the likelihood algorithm. However, the cross-referencing of images from the 1986 and 2020 period from the land change modeler module made it possible to assess the gains and losses of land use categories. Indeed, eleven classes of land use have been identified but which are not always well differentiated. The changes observed operate differently during the periods 1986-2010 and 2010-2020. The overall rate of change shows a notable regression in certain categories of land cover. These are mainly natural plant formations (Coastal forests, Sub-montane forests and mangroves) with respectively an overall regression of the order (-30.28%, -14.33% and -38.37%) of the total area of the study area. At the same time, significant progress is observed on the side of young secondary forests and dense mountain forests respectively of the order (33.94% and 13.49%). of the built-up areas and peasant agro-plantations class with an overall expansion rate of around 137.29% and 29%. However, during the period 1986 to 2021 four forms of change have been observed in the landscape. It is another phenomenon of natural regeneration of dense mountain and young secondary forests which represents 39% of the landscape followed by the phenomenon of regeneration which represents 32.68% of the landscape area. The phenomenon of deforestation represents 17% of the surface of the landscape, and finally the phenomenon of urbanization which represents 10.96% of the landscape. All this could be explained by the strong anthropization of the landscape by human activities. It seems necessary to take urgent measures to safeguard the remaining ecosystems in order to allow a more balanced development of the area. Key words. Land cover, landscape, remote sensing, GIS, anthropization, Mount Cameroon.<\/strong><\/p>\n ===============================================================<\/p>\n <\/p>\n Characterization of the effects of the metropolisation of Douala on the city of Dibombari by remote sensing and GIS<\/strong><\/p>\n <\/p>\n Julius TATA Nfor (1) & NIOTO Brigitte Nancy (1)<\/em><\/strong><\/p>\n <\/p>\n (1) Unit\u00e9 de Recherche de Climatologie et d\u2019Etudes Environnementale (UCLIREN) D\u00e9partement de G\u00e9ographie-Am\u00e9nagement-Environnement, Universit\u00e9 de Dschang<\/p>\n <\/p>\n Abstract. <\/strong> Les syst\u00e8mes d\u2019information g\u00e9ographique (SIG) et la T\u00e9l\u00e9d\u00e9tection sont devenus un v\u00e9ritable d\u2019outil d\u2019analyse spatiale, touchant presque tous les domaines, tels que l\u2019urbanisme. L\u2019objectif de cette recherche est d\u2019explorer la contribution de l\u2019utilisation combin\u00e9e de la t\u00e9l\u00e9d\u00e9tection et des SIG dans la gestion d\u2019effets de la m\u00e9tropolisation de Douala sur la ville de Dibombari. Quatre axes ont \u00e9t\u00e9 choisis pour cette \u00e9tude : la couverture spatiale, l\u2019\u00e9volution d\u00e9mographique, les flux d’\u00e9changes et services entre les deux villes et l\u2019occupation fonci\u00e8re sur une p\u00e9riode de 43 ans (1977 \u00e0 2020) \u00e0 partir d\u2019images Landsat. Les trajectoires d\u2019\u00e9volution des changements d\u2019occupation et d\u2019usage des sols ont d\u2019abord \u00e9t\u00e9 reconstruites \u00e0 partir de la classification des images satellite selon une approche orient\u00e9e-objet. Ensuite, des m\u00e9triques paysag\u00e8res ont \u00e9t\u00e9 calcul\u00e9es afin d\u2019analyser les principales dynamiques spatio-temporelles de l\u2019expansion urbaine et leur impact sur les structures paysag\u00e8res. Les enqu\u00eates de terrain ont \u00e9t\u00e9 men\u00e9es pour avoir les donn\u00e9es statistiques. Les r\u00e9sultats r\u00e9v\u00e8lent une nette progression du tissu urbain qui est in\u00e9galement r\u00e9parti dans l\u2019espace, mais surtout concentr\u00e9 autour des routes nationales n\u00b03 et n\u00b05 et autour des limites entre Douala IV et les villages proches de Dibombari. Cette progression de la consommation fonci\u00e8re, d\u2019un taux moyen 1,2%\/an \u00e0 compter de 2014 s’est principalement effectu\u00e9e au d\u00e9triment des terres agricoles tandis que la tache urbaine continue d\u2019int\u00e9grer de plus en plus les espaces verts proche de Douala. La projection faite de l\u2019\u00e9volution urbaine de la ville de Dibombari, \u00e9tant tr\u00e8s optimiste va conduire \u00e0 l\u2019actualisation de la base de donn\u00e9es fonci\u00e8re et \u00e0 la naissance de projets de cartographie Web, pour la simplification des interactions des particuliers et les services communaux pour la naissance d\u2019une Dibombari r\u00e9siliente. Key words. Metropolisation, Remote sensing, GIS, City of Dibombari, Cameroon.<\/strong><\/p>\n ===============================================================<\/p>\n <\/p>\n Contribution of geomatics to the mapping of areas at risk of malaria transmission in the city of Yamoussoukro (Central Ivory Coast)<\/strong><\/p>\n <\/p>\n KOUAME Adonis Krou Damien (1), KOUADIO TAMEGNON Jean Carlos (1), GNAZAL\u00c9 Gnahoua Guy Roger (1)<\/em><\/strong><\/p>\n <\/p>\n (1) Universit\u00e9 F\u00e9lix HOUPHOUET-BOIGNY, UFR STRM\/CURAT<\/p>\n <\/p>\n Abstract. <\/strong>La propagation des maladies \u00e0 transmission vectorielle d\u00e9pend de la persistance de facteurs climatiques et environnementaux qui favorisent la reproduction des vecteurs. Le paludisme est l’une des maladies \u00e0 transmission vectorielle les plus dangereuses et son impact reste consid\u00e9rable en C\u00f4te d’Ivoire. Il est \u00e0 la base de nombreux d\u00e9c\u00e8s, mais sa r\u00e9partition spatiale et la pr\u00e9vision des risques sont des d\u00e9fis que les autorit\u00e9s sanitaires ont des difficult\u00e9s \u00e0 relever. L\u2019objectif de ce travail est de cartographier les zones potentiellement sensibles au d\u00e9veloppement des g\u00eetes larvaires et de nuisance des anoph\u00e8les dans la ville de Yamoussoukro \u00e0 l\u2019aide des techniques de la g\u00e9omatique. L’utilisation combin\u00e9e d’images satellitaires et de donn\u00e9es multisources int\u00e9gr\u00e9es dans un Syst\u00e8me d’Information G\u00e9ographique (SIG) a permis de d\u00e9terminer les zones d’intervention prioritaires en fonction de l’analyse des facteurs environnementaux qui conduisent \u00e0 la transmission du paludisme \u00e0 Yamoussoukro. Ainsi, le traitement des images satellites a permis d\u2019extraire, les classes d\u2019occupation du sol, la temp\u00e9rature de surface, et l’humidit\u00e9 de surface. L\u2019int\u00e9gration de ces facteurs environnementaux dans un SIG \u00e0 l\u2019aide de l\u2019analyse multicrit\u00e8re par la m\u00e9thode AHP a permis de g\u00e9n\u00e9rer des cartes de risques paludique qui permettent de distinguer trois niveaux de risque qui sont : le risque faible, le risque moyen et le risque \u00e9lev\u00e9. Globalement, 29,28 % de la superficie totale de la ville de Yamoussoukro a \u00e9t\u00e9 class\u00e9e comme espace \u00e0 risque \u00e9lev\u00e9 de prolif\u00e9ration des moustiques. Ces cartes du risque de paludisme pourraient \u00eatre utilis\u00e9es pour \u00e9tablir les priorit\u00e9s des mesures de lutte contre le paludisme. Keywords. Remote sensing, GIS, environmental factors, malaria, AHP, Yamoussoukro, Ivory Coast.<\/strong><\/p>\n ===============================================================<\/p>\n <\/p>\n Mapping of the dynamics of forest cover and evaluation of the processes of fragmentation of the classified forest of the three rivers in the North-East of Benin<\/strong><\/p>\n <\/p>\n MOUSSA Abdel Djalilou (1), AROUNA Ouss\u00e9ni (2), SOUFOUYANE Zakari (1), TOKO IMOROU Isma\u00efla (1)<\/em><\/strong><\/p>\n <\/p>\n (1) Laboratoire de Cartographie (LaCarto), Institut de G\u00e9ographie, de l\u2019Am\u00e9nagement du Territoire et de l\u2019Environnement (IGATE), Universit\u00e9 d\u2019Abomey-Calavi, B\u00e9nin. <\/p>\n Abstract. <\/strong>The classified forest of Trois Rivi\u00e8res and its periphery (FCTRP) are undergoing strong disturbances. With this in mind, the dynamics of vegetation types were studied by supervised classification under Envi 5.1 of SPOT (2005) and Sentinel 2 (2019) images. ArcGIS 10.5 software was used to map land cover. The changes that occurred were assessed from the transition matrix. Spatial structure indices were determined with Fragstats software. From the different analyses, a reduction of 28% of forest formations in favor of anthropogenic formations was observed. Dense dry forests suffered more degradation with 63% loss, while plantations (70%), fields and fallows (60%) and settlements (52%) experienced more gains. The ongoing transformations in the FCTRP are removal (36%) of patches in natural formations and creation (36%) in anthropogenic formations. The disturbance index (u = 0.58) indicates a predominance of natural formations in 2019, a clear sign that forest cover recovery is still possible if disturbance stops. Keywords. Forest landscapes, Fragmentation, classified forest of Trois Rivi\u00e8res, periphery, Benin.<\/strong><\/p>\n ===============================================================<\/p>\n <\/p>\n Modeling rock falls in Ngaound\u00e9r\u00e9 (Cameroon)<\/strong><\/p>\n <\/p>\n NDJEUTO TCHOULI Prosper Innocent (1), FOTSING Marcel Junior (1), MOUHAMAN Issouhou (1), BARDOU Eric (2), TCHOTSOUA Michel (3)<\/em><\/strong><\/p>\n <\/p>\n (1) Docteur, Laboratoire de g\u00e9omatique Universit\u00e9 de Ngaound\u00e9r\u00e9 <\/p>\n Abstract. <\/strong>The essentially spontaneous growth of the city of Ngaound\u00e9r\u00e9 has as a corollary the occupation of the slopes of the Ngaound\u00e9r\u00e9 and Ngaoundai mountains, thus exposing the populations to the risks of falling boulders. This article assesses the extent of the dangers associated with the falls of some of these boulders. The morpho-pedological data collected and formatted made it possible to simulate their descents using the Rockyfor3D application. The results of this simulation allowed the delineation of the risk sectors, classified into three main sets, according to the energy generated by each block during its descent. The authorities in charge of the development of the city of Ngaound\u00e9r\u00e9 can use these results to strengthen the city's resilience to these natural risks. Key words. Boulder fall, risk, modeling, urban space, Ngaound\u00e9r\u00e9.<\/strong><\/p>\n ===============================================================<\/p>\n <\/p>\n
2) Professeur des Universit\u00e9s \/ Universit\u00e9 de Maroua
3) Ma\u00eetre de conf\u00e9rences \/ Universit\u00e9 de Maroua
4) Ma\u00eetre de conf\u00e9rences \/ Universit\u00e9 de Maroua
5) Assistant \/ Universit\u00e9 de Maroua
6) Doctorant \/ Universit\u00e9 de Yaound\u00e9 I<\/p>\n
(2) Topographe, Gloval Map and Survey Engeniering<\/p>\n
(2) Universit\u00e9 de Yaound\u00e9 1, Ecole Normale Sup\u00e9rieure
(3) ONG I Love Geomatic. Yaound\u00e9
Universit\u00e9 de Dschang, IUT Victor Fotso de Bandjoun<\/p>\n
(2) Charg\u00e9e de cours, Universit\u00e9 de Yaound\u00e9 I<\/p>\n
(2) G\u00e9ographe, Enseignante-chercheure, Ma\u00eetre de Conf\u00e9rences \u00e0 l\u2019Universit\u00e9 Abdou Moumouni de Niamey
(3) Master G\u00e9ographie, Universit\u00e9 Abdou Moumouni de Niamey<\/p>\n
(2) Universit\u00e9 de Bertoua, Ecole Normale Sup\u00e9rieure (ENS). BP. 652, Bertoua (Cameroun)
(3) Cirad, UMR Innovation, F-34398 Montpellier, France, ludovic.temple@cirad.fr
(4) INNOVATION, Univ Montpellier, F-34090 Montpellier, France<\/p>\n
(2) Charg\u00e9 de Cours, Universit\u00e9 de Dschang, IUT de Bandjoun, D\u00e9partement d\u2019Informatique
(3) PLEG d\u2019Informatique, option : Technologie de l\u2019Information et de la Communication<\/p>\n
(2) D\u00e9partement de Math\u00e9matique et d’Informatique, URIFIA laboratory, Facult\u00e9 des Sciences, Universit\u00e9 de Dschang<\/p>\n
(2) Laboratoire de G\u00e9osciences, de l\u2019Environnement et Applications, Universit\u00e9 Nationale des Sciences, Technologies, Ing\u00e9nierie et Math\u00e9matiques (UNSTIM), Abomey, B\u00e9nin.<\/p>\n
(2) Docteur, Centre de Recherche sur l\u2019Environnement Alpin (CREALP)
(3) Professeur Titulaire des Universit\u00e9s, Universit\u00e9 de Ngaound\u00e9r\u00e9<\/p>\n