Newsmap: A semi-supervised approach to geographical news classification

Kohei Watanabe

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This paper presents the results of an evaluation of three different types of geographical news classification methods: (1) simple keyword matching, a popular method in media and communications research; (2) geographical information extraction systems equipped with named-entity recognition and place name disambiguation mechanisms (Open Calais and Geoparser.io); and (3) a semi-supervised machine learning classifier developed by the author (Newsmap). Newsmap substitutes manual coding of news stories with dictionary-based labelling in the creation of large training sets to extract large numbers of geographical words without human involvement and it also identifies multi-word names to reduce the ambiguity of the geographical traits fully automatically. The evaluation of classification accuracy of the three types of methods against 5000 human-coded news summaries reveals that Newsmap outperforms the geographical information extraction systems in overall accuracy, while the simple keyword matching suffers from ambiguity of place names in countries with ambiguous place names.

Original languageEnglish
Pages (from-to)294-309
Number of pages16
JournalDigital Journalism
Volume6
Issue number3
DOIs
Publication statusPublished - 2018 Mar 16
Externally publishedYes

Keywords

  • content analysis
  • digital methods
  • geographical classification
  • international news
  • machine learning
  • news flow

ASJC Scopus subject areas

  • Communication

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