A high speed geocoding method for location-based service with coloring map images

  • Authors:

  • Koji Tajima;Kimihiko Ando;Kohta Ohshima;Matsuaki Terada

  • Affiliations:

  • Dept. of Electronic and Information Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan;Dept. of Electronic and Information Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan;Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology, Tokyo, Japan;Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology, Tokyo, Japan

  • Venue:
  • ICOIN'09 Proceedings of the 23rd international conference on Information Networking
  • Year:
  • 2009

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Abstract

This paper proposes a high-speed reverse geocoding method for Location-based Service. In geocoding, the longitude and latitude become mutually convertible with the "area name." The "area name" is an address and landmark name such as "Koganei City" and "Tokyo Tower" that are easy for the user to understand. In traditional reverse geocoding methods, long conversion time and low conversion accuracy are problems. Our method reduces these problems by using image-based conversion methods. First, we create "colored map images" and a "color mapping table" for a region from the vector data used in the GIS. Second, we convert the longitude and latitude into a color code such as "FFOOEE" using the colored map images. Finally, we obtain the area name from the "color-mapping table." By this method, we can get the area name from the longitude and latitude without a long calculation time that depends on the number of reiterated areas. We evaluated the proposed method using the data of a segmented ward, city, town and village of Saitama Prefecture in Japan. As a result, we increased the conversion speed by about 70 times. In addition, we reduced the conversion error rate in comparison with the traditional point-based conversion.