The University of Lisbon at GeoCLEF 2006

  • Bruno Martins
  • Nuno Cardoso
  • Marcirio Silveira Chaves
  • Leonardo Andrade
  • Mário J. Silva
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4730)


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.


Query Expansion Geographic Scope Ontology Concept Relationship Term Relevance Ranking 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Bruno Martins
    • 1
  • Nuno Cardoso
    • 1
  • Marcirio Silveira Chaves
    • 1
  • Leonardo Andrade
    • 1
  • Mário J. Silva
    • 1
  1. 1.Faculty of Sciences, University of Lisbon 

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