NICTA I2D2 group at GeoCLEF 2006

Abstract

We report on the experiments undertaken by the NICTA I2D2 Group as part of GeoCLEF 2006. We experimented with geographic-based query expansion, using a gazetteer to extend geospatial terms to "nearby" locations, and included sublocations. The processing pipeline of the geographic information retrieval system included: a named entity recognition system for identifying location names; a toponym resolution component for assigning probabilistic likelihoods to geographic candidates obtained from a gazetteer (the Getty Thesaurus); and a probabilistic approach to Geographic Information Retrieval. We experimented with approaches involving expanding location names in both documents and queries. We us..