This paper presents an unsupervised segmentation method applied to multispectral satellite images especially SPOT images. The main objective of this work is to combine spectral and contextual information in order to extract the most important cartographic regions. We choose a mathematical morphology context. Previous morphological works are usually interested in one type of land covering area. The proposed technique globalizes the problem by considering all the important regions to perform complete and automatic multispectral satellite images cartography.