DCU at NTCIR-8 GeoTime

Abstract

In this report, we describe the experiments carried out by Dublin City University for NTCIR GeoTime 2009-10. In all we submitted five runs, which evaluated the benefit of including clustered location information when compared to a standard word-term text IR ranking. The baseline technique was the Lucene default and we developed three different algorithms to re-rank the results based on location occurrance. In conclusion we found that the inclusion of location information to re-rank documents only offered a minor improvement over the baseline. Our analysis leads us believe that larger gains can be made through including location information at the indexing and initial querying stage, and then refining the final ranked list by standard IR techniques.