Cartographie Par Imagerie Satellitale Et Discrimination Lithologique Du Complexe Magmatique D’anna (eglab, Dorsale Reguibat, Sud-ouest Algerien)

Résumé: This article provides a map of the Anna magmatic ring complex (Eglab, Dorsale Reguibat, Algerian SW), on the theme of methods not supervised used in remote sensing. The quantification and the related problem of the classification by the method of mobile centers, also known under the name of method of k-means, directs us toward the search for methods as tools of generalization of these treatments. Unlike the supervised classification, there are no classes determined in advance. By performing a step of clustering, it draws data some information, identify the characteristics and identifying underlying phenomena. The study carried out has allowed us to test the use of treatments of Landsat images 8 OLI for the mapping of Anna magmatic ring complex. The results obtained have been confronted with field data. The different approaches to access the expected results are addressed in this work, as well a system of analysis and semantic interpretation of remote sensing images as automatic as possible is presented. Knowing that the k-means method corresponds to the probabilistic formulation of the problem of classification, the purpose being, on the one hand the characterization of geological facies of the Anna magmatic ring complex, and on the other hand to put in place a digital mapping working in the direction of the geological reconnaissance. The result of this approach has allowed us to recognize five magmatic facies thus forming the magmatic complex of Anna.

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