Tokyo has one of the most comprehensive public transit systems in the world. Curtis Fenner has built an isochrone map that allows you to see where you can travel in the city by train in a given time.
The purpose of the map is to help people make crucial decisions about where to live by visualizing real-world commute times. It effectively achieves this by not only showing the reach of the entire network but also highlighting areas that are surprisingly difficult to get to, revealing what Curtis calls "train deserts" -pockets in the city that are more than a ten-minute walk from a station.
Users can input a single destination into the map How Far Can Trains Take Me in Tokyo? to see all the areas reachable within a specified commute time. The map also has a feature that allows for the addition of multiple destinations. When more than one destination is entered, the map blends the travel times, which can be useful for planning a meeting spot or finding a place to live that optimizes the commutes for multiple people. The settings panel also allows users to adjust the maximum door-to-door commute time and the maximum walk time to a station.
Tokyo has around 100 different transit lines and more than a dozen different train operators. These private operators typically do not publish their schedules in an easily usable format, which means most maps simply can't account for them. This map, however, tackles this challenge head-on by using a combination of web scraping and estimation to fill in the data gaps, resulting in a more complete travel time map of the city.
If you are interested in exploring an isochrone map of your city then you might find one under the Maps Mania isochrone tag.
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