Blind relevance feedback and named entity based query expansion for geographic retrieval at GeoCLEF 2006

Authors:
Kerstin Bischoff;Thomas Mandl;Christa Womser-Hacker
Affiliations:
University of Hildesheim, Information Science, Hildesheim, Germany;University of Hildesheim, Information Science, Hildesheim, Germany;University of Hildesheim, Information Science, Hildesheim, Germany
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

In its participation at GeoCLEF 2006, the University of Hildesheim focused on the monolingual German and English and the bilingual German ↔ English tasks. Based on the results of GeoCLEF 2005, the weighting of and the expansion with geographic named entities (NE) within a Boolean retrieval approach was examined. Because the best results 2005 were achieved with Blind Relevance Feedback (BRF) in which NEs seemed to play a crucial role, the effects of adding particular geographic NEs within the BRF are explored. The paper presents a description of the system design, the submitted runs and results. A first analysis of unofficial post experiments indicates that geographic NEs can improve BRF and supports prior findings that the geographical expansion within a Boolean retrieval approach does not necessarily lead to better results - as it is often assumed.