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Geolocalized databases are becoming necessary in a wide variety of application domains. The manual creation of such databases is an expensive operation which stimulated the interest for the automation of their construction, by mining geographic information from the Web. In this article, we present and evaluate a new automated approach for creating a geographical database. Our technique uses Wikipedia to identify geographical names, categorize them, find their geographical coordinates and rank them according to some relevance creterion. This database has been integrated in ThemExplorer, an application for geographic image retrieval. MOTS-CLES : Bases de donnees georeferencees, Wikipedia, extraction d’information, fouille de donnees, ThemExplorer.

Extraction des connaissances à partir du Web pour la recherche des images géoréférencées