Exploiting geographic references of documents in a geographical information retrieval system using an ontology-based index |
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Authors: | Nieves R Brisaboa Miguel R Luaces Ángeles S Places Diego Seco |
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Affiliation: | 1.Database Laboratory,University of A Coru?a,A Coru?a,Spain |
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Abstract: | Both Geographic Information Systems and Information Retrieval have been very active research fields in the last decades. Lately, a new research field called Geographic Information Retrieval has appeared from the intersection of these two fields. The main goal of this field is to define index structures and techniques
to efficiently store and retrieve documents using both the text and the geographic references contained within the text. We
present in this paper two contributions to this research field. First, we propose a new index structure that combines an inverted
index and a spatial index based on an ontology of geographic space. This structure improves the query capabilities of other
proposals. Then, we describe the architecture of a system for geographic information retrieval that defines a workflow for
the extraction of the geographic references in documents. The architecture also uses the index structure that we propose to
solve pure spatial and textual queries as well as hybrid queries that combine both a textual and a spatial component. Furthermore,
query expansion can be performed on geographic references because the index structure is based in an ontology. |
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