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都道府県別 人口の推移

✓ Published0🌍 Public
NNaomiAsano
Last edited Aug 14, 2018
Created on Aug 14, 2018

This visualization shows the population changes of Japan’s 47 prefectures over time, using a choropleth map colored by population value. A user selects a year from a dropdown menu, triggering a smooth two-second color transition that updates prefecture fills. The map is rendered with D3 v3’s `d3.geo.mercator` projection and `d3.geo.path`, with circles marking prefectural capitals. Population data comes from the Statistics Bureau of Japan, and map boundaries use TopoJSON. A color legend built with `d3.legend` clarifies the scale.

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forked from <a href='http://bl.ocks.org/n1n9-jp/'>n1n9-jp</a>'s block: <a href='http://bl.ocks.org/n1n9-jp/e515f3df49957efc8693b746fdaf7bc8'>都道府県別 人口の推移</a>

forked from <a href='http://bl.ocks.org/anonymous/'>anonymous</a>'s block: <a href='http://bl.ocks.org/anonymous/82aa88a4b1990e1cf9d1ae8809a8ba78'>都道府県別 人口の推移</a>

forked from <a href='http://bl.ocks.org/LastSamurai03/'>LastSamurai03</a>'s block: <a href='http://bl.ocks.org/LastSamurai03/e2d04e3cc3c0936822943971e4f07fb5'>都道府県別 人口の推移</a>

mit Licensed

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