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都道府県別 人口の推移

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LLastSamurai03
Last edited Jul 8, 2016
Created on Jul 8, 2016

This interactive map visualizes population changes across Japan’s 47 prefectures from 1920 to 2012. A dropdown menu selects a year, triggering a two-second color transition on each prefecture based on population values, using a linear blue scale. The visualization uses D3 v3 with `d3.geo.mercator` and `d3.geo.path` to render TopoJSON boundaries, while population data is loaded from TSV files via the queue library. Prefecture capitals appear as black circles. Data is sourced from Japan’s Statistics Bureau.

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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>

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