Cartographie par télédétection des changements de la couverture végétale sur la bande littorale ouest-africaine: exemple des Rivières du Sud du delta du Saloum au Rio Geba

Abstract : This paper aim is mapping and quantification of vegetation land cover changes in West-African coastal zone using LANDSAT TM images. A multistage unsupervised classification has been designed for this purpose. The objective was land cover mapping, with a predefined typology, by means of a reproducible method that could be easily generalized to other regions. The first step is an interpretation of the unsupervised classification, the clusters of which are regrouped according to the typology. The classification is improved by enhancing radiometric contrasts with Principal Component Analysis applied to LANDSAT bands, followed by a second unsupervised classification to re-classify the previously ill-classified cells. The analysis of multitemporal LANDSAT images has shown that, during the last three decades wooded areas (both in mangrove and savannah) had experienced few changes. Within 25 years, wooded areas increased of less than 1 percent of wooded areas in 1979. However, this quantitative balance results from a first trend of reduction of wooded areas during the 1980's followed by a second trend of increase during the 1990's.
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  • HAL Id : halshs-00388170, version 1

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Julien Andrieu, Catherine Mering. Cartographie par télédétection des changements de la couverture végétale sur la bande littorale ouest-africaine: exemple des Rivières du Sud du delta du Saloum au Rio Geba. Teledetection, Editions des Archives Contemporaines / Editions scientifiques GB / Gordon and Breach Scientific Publishers, 2008, 8 (2), pp.93-118. ⟨http://www.archivescontemporaines.com/revues/35⟩. ⟨halshs-00388170⟩

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