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A Method of Geographical Name Extraction from Japanese Encyclopedia for Text Search in which the Results are Ordered by Geographical Areas

Kanada, Y., IPSJ SIGNL Technical Report, 99-NL-132-2, 1999, Published by IPSJ (in Japanese).

[ 日本語のページ ]
[ Paper PDF file (in Japanese) ] [ Paper PostScript file (in Japanese) ]

Abstract: A text retrieval method called the thematic mapping search method has been developed for Japanese texts. In this method, the user specifies a search theme using free words, then obtains a sorted list of excerpts and hyperlinks to sentences that contain geographical names. Using this list, the user can open maps that indicate the location of the names. To generate an index of names for this searching, a method of geographical name extraction has been developed. In this method, geographical names are extracted, matched to names in a geographical name database, and identified. Geographical names, however, often have several types of ambiguities. Ambiguities are resolved using context analysis and several other techniques. As a result, the precision of extracted names is more than 96% on average when applied to the World Encyclopedia. The rules for information extraction depends on features of the Japanese language, but the strategy and most of the techniques can be applied to texts in English or other languages.

Introduction to this research theme: Axis-Specified Search (Thematic Search)

Keywords: Text search, Axis-specified search, Area-axis search, Thematic mapping search, Thematic geographical name search, Geographical information extraction, Geographical name extraction, Encyclopedia search

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