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The increasing availability of high spatial resolution satellite images is an opportunity to characterize and identify urban objects. Object-based approaches using domain knowledge for image analysis are necessary to classify data. A major issue in these approaches is domain knowledge formalization and exploitation. The use of formal ontologies seems a judicious choice to deal with these issues, and therefore, an ontology concerning urban objects has been developed. Description logics (DL) have been used to exploit the knowledge in the ontologies and develop software tools to assist the automatic labelling of satellite images.
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