The University of Lisbon at GeoCLEF 2006

Authors:
Bruno Martins;Nuno Cardoso;Marcirio Silveira Chaves;Leonardo Andrade;Mário J. Silva
Affiliations:
Faculty of Sciences, University of Lisbon;Faculty of Sciences, University of Lisbon;Faculty of Sciences, University of Lisbon;Faculty of Sciences, University of Lisbon;Faculty of Sciences, University of Lisbon
Venue:
CLEF'06 Proceedings of the 7th international conference on Cross-Language Evaluation Forum: evaluation of multilingual and multi-modal information retrieval
Year:
2006

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Abstract

This paper details the participation of the XLDB Group from the University of Lisbon at the 2006 GeoCLEF task. We tested text mining methods that use an ontology to extract geographic references from text, assigning documents to encompassing geographic scopes. These scopes are used in document retrieval through a ranking function that combines BM25 text weighting with a similarity function for geographic scopes. We also tested a topic augmentation method, based on the geographic ontology, as an alternative to the scope-based approach.