Abstract
We study the availability of the Huff model, the opportunities model and the Voronoi diagram. And we presume the commercial sphere about big shopping center in Kyoto city by using the above-mentioned three models. We kept a result as follows; 1. The Voronoi diagram is available as well as the Huff model in case of the presumption of the commercial sphere about big shopping center. 2. Using the time-distance as a distance is available. 3. We don't presume the commercial sphere exactly without consideration about the shopping center.
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