人口密度
Posted by Sean at 09:24, December 20th, 2005Virginia Postrel has one of her interesting posts about sprawl up. Fun fact from my part of the world: New York is more densely populated than Tokyo. Of course, that’s from official measurements, but it’s really not so hard to believe. Simply dividing the total population by the total land area gives a nice, rough point of departure, but as Virginia points out about New York and LA, it doesn’t tell the whole story by half.
If you visit Tokyo, as opposed to living in it, you may never really see much outside the major interchange stations on the Yamanote Line; but just a few stops beyond that inner ring, the landscape is completely different. When I lived in Shibuya, my apartment building was the only residential structure within a good five or six contiguous blocks. Where we live now, just four stations outside Shibuya in Setagaya Ward, just about everything is residential. The storefronts, even along major thoroughfares such as Komazawa Avenue, mostly have apartments above them. Zoning in Japan is kind of weird to many Westerners–there really is a lot of mixed construction–but as an overall pattern, Tokyo is one of those cities in which nighttime and daytime populations cluster in visibly different places, which means that the crushing density tends to follow people around–or, more accurately, that they create it by all moving together.
And like just about any other city, Tokyo doesn’t stop at Tokyo. Urban-level average population density continues southwest through Kawasaki (1.3 million), Yokohama (3.5 million), and the smaller cities in Kanagawa Prefecture, including Atsushi’s hometown of Kamakura (a comparative hamlet at 170,000). It also goes east through Chiba Prefecture, north through Saitama Prefecture, and west through the municipalities that have been annexed by the Tokyo Metropolitan District but aren’t part of the original twenty-three wards. None of these places is in the mindspace that you’d think of as Tokyo, but they’re definitely part of the metro area. By contrast, some land (such as hiking places deep in the mountains in Ome City, to which you have to take an old single-track train) is so unpopulated that even calling it rural seems a stretch, but it lies inside Tokyo Metro, so it’s counted for a lot of statistics.