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This project was aimed at developing a method for geo-ecological zoning of the upper Niger basin, in order to select representative basins according to morphological, hydrological and spectral characteristics. Based on the zoning obtained, six automatic agrometerological measuring stations were installed in the Niger basin. Both topographical maps and digital satellite images were analysed, using the 199 sub-basins of the Niger's tributaries as surface units of reference. Four significant morphometric parameters were selected, which were then measured in the maps. Five spectral parameters were derived from the satellite data. A principal component analysis confirmed the linear independence of the data. Clusters based on morphometric and spectral data were interpreted by means of cluster analysis and its graphical presentation, permitting selection of six representative groups of basins. For these the multitemporal vegetation indices were determined from the 1975 and 1976 MSS images and changes in vegetation cover illustrated graphically. The project also enabled plans to be prepared for an EC-funded reforestation programme in Guinea.

Additional information

Authors: KOHL H-G, Universität Trier (DE)
Bibliographic Reference: EUR 14819 DE (1992) 122 pp., FS, free of charge
Availability: Available from Joint Research Centre, Publication Department, I-21020 Ispra (Va.) (IT)
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