The UPV at GeoCLEF 2008: the GeoWorSE System
Davide Buscaldi, Paolo Rosso · 2015
This year our system was complemented with a map-based filter. During the indexing phase, all places are disambiguated and assigned their coordinates on the map. These coordinates are stored in a separate index. The search process is carried out in two phases: in the first one, we search the collection with the same method applied in 2007, which exploits the expansion of index terms by means of WordNet synonyms and holonyms. The next phase consists in a re-ranking of the results of the previous phase depending on the distance of document toponyms from the toponyms in the query, or depending on the fact that the document contains toponyms that are included in an area defined by the query. The area is calculated from the toponyms in the query and their meronyms. This is the first attempt to use GeoWordNet, a resource that includes the geographical coordinates of the places listed in WordNet, for the Geographical Information Retrieval task. The results show that map-based filtering allows to improve the results obtained by the base system, based only on the textual information.