Dev tools · September 23, 2024
Interactive map of the convenience store "turf war" in Japan
Technologies used: Leaflet (frontend) Turf (Geojson generation and Voronoi generation) I noticed that my neighborhood is all Lawsons, so I got the location of all Conbinis and ran some basic analysis to see if these pockets of brand territory are common. I haven't worked much with web frontends before, so feedback is welcomed. I also have some ideas to maybe expand upon, like making the territory calculations based on streets and other geographical features rather than just beeline distance. The site isn't tested too much on mobile yet, but should be ok. Currently the frontend code and…
Interactive map of the convenience store "turf war" in Japan launched on September 23, 2024 with 114 votes, #487 of 5,281 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 2 years on.
In plain words
This interactive map visualizes territorial patterns of Japan's convenience store chains by mapping all store locations and calculating their market coverage areas using Voronoi diagrams. Built with Leaflet and Turf.js, it reveals whether certain neighborhoods cluster around specific brands like Lawson. The tool is designed for anyone curious about retail geography and competitive store placement, with potential for expansion to factor in street networks and natural boundaries rather than straight-line distances.
written from the facts on this page · September 2026
From the sources
This interactive map reveals the territorial battles between Japan
In the maker’s words, at launch
Technologies used: Leaflet (frontend) Turf (Geojson generation and Voronoi generation) I noticed that my neighborhood is all Lawsons, so I got the location of all Conbinis and ran some basic analysis to see if these pockets of brand territory are common. I haven't worked much with web frontends before, so feedback is…
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