Nuno Cardoso, Bruno Martins, Marcirio Chaves, Leonardo Andrade and Mário J. Silva XLDB Group - Department of Informatics Faculdade de Ciências da Universidade.

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Nuno Cardoso, Bruno Martins, Marcirio Chaves, Leonardo Andrade and Mário J. Silva XLDB Group - Department of Informatics Faculdade de Ciências da Universidade de Lisboa {ncardoso, bmartins, mchaves, leonardo, xldb.fc.ul.pt The University of Lisbon at CLEF 2006

Poster #1: ad-hoc participation - Goal: Develop a stable testbed to test GIR approaches - Improvements since 2005: QE, and Retrieval & Ranking module. Poster #2: GeoCLEF participation - Goal: Compare 2 strategies for GIR against conventional IR approach: #1: Geographic text mining #2: Augmentation of geographic terms The University of Lisbon at CLEF 2006

Geographic text mining (strategy #1 at GeoCLEF 2006): 1) Mining geographic references from text. 2) Assign a scope to each document. 3) Convert topics into triples. 4) assign scopes to terms. 5) BM25 + geographic similarity