Lowlands Mapping in Forest Guinea

Lowlands Mapping in Forest Guinea

S. Saïdi (Territoires, Environnement, Télédétection et Information Spatiale (CIRAD/UMR TETIS), Montpellier Cedex 5, France), A. Camara (Institut de Recherche Agronomique de Guinée, Conakry, Guinea), L. Gazull (Territoires, Environnement, Télédétection et Information Spatiale (CIRAD/UMR TETIS), Montpellier Cedex 5, France), M. Passouant (Environnement, Télédétection et Information Spatiale (CIRAD/UMR TETIS), Montpellier Cedex 5, France) and M. Soumaré (Institut d’Economie Rurale (IER), Sotuba, Bamako, Mali)
DOI: 10.4018/jaeis.2013010102
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Abstract

This article presents a lowland mapping method for the Forested Guinea (Guinée Forestière) using a 30 m resolution Digital Elevation Model (DEM) that is currently the best option to analyze large forested areas. This low cost DEM method applies surface topography analysis processes to better discriminate areas with stagnant and/or accumulated water. The main index selected is the immediate proximity of flat areas to drainage network, the former with slope gradients not exceeding 5% (2.86°). The mapped lowlands potential cover a surface of 4516 km2, i.e., 10% of the total area of the region with hydro-agricultural potential.
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2. Location And Characteristics Of The Study Area

Located between latitude 7° and 10° North and longitude 7°30' and 11° West, Forested Guinea is the fourth natural region of Guinea. It is surrounded on three sides by Sierra Leone, Liberia and Ivory Coast (Figure 1).

Figure 1.

Geographic localisation of study area

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