Abstract not available.

Remote sensing offers an economical tool to perform forest mapping and to meet forest manager needs. The main objective of this thesis is to compare the results of both supervised classification and linear spectral analysis methods of forest cover mapping from the same sector of Anticosti Island. Supervised classification is a binary method of mapping where the pixel can be associated with only one thematic class whereas linear spectral mixture analysis is based on the principle of continuity, meaning that a single pixel can belong to more that one information class. To meet our objectives, the image used in this thesis was acquired on August 24 2001 by Landsat-7's ETM+ sensor. Radiometric calibration, atmospheric corrections and geometric corrections were applied to the image. Spectroradiometric data acquired by ASD (Analytical Spectral Devices) between 350 nm and 2500 nm were also used. The results show that the supervised classification performed with parallelepiped algorithm combined with the maximum likelihood algorithm produced good results for forest mapping in a mixed environment. The results from this method can be used to perform multitemporal studies regarding forest cover observation on Anticosti Island i.e., disease infestation, forest fire, heavy browsing by deer and regeneration. However, the linear spectral mixture analysis method results were not as conclusive as expected because of the limited number of spectral bands that can be used, the spectral regions covered by those spectral bands, and the similarity between the spectral signature of the different forest species.

Increasing of the population by refugees invasion puts under constraint the process of Gueckedou's sustainable development. This area is passing through a dramatic damage upon its forest because of surexploitation of Sierra Leonai and Liberian refugees and native's population. Comparatively refugees are majority and natives the minority. So concerning the management of their resources, they don't have any responsibility. This is opposite to Rio summit objectives. Agenda 21 recommends to all governments that local populations' participation is essential to attend sustainable development. An inquiry made in Gueckedou's region shows that Kissi natives have many possibilities to be involved in their forests' management. That means traditional structures which can help to participate in development process are weakened by cultural identity crisis from the fact of Kissi's "minorization" due of refugees' invasion. Because those structures are prohibited by the administration contributes to weaken them. So, to reach a better management of resources in Gueckedou prefecture, it will be useful to restore traditional structures before they disappear. They would be a good opportunity for the Kissi native to participate actively in laws application about forest resources management.

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