都道府県別 人口の推移
An animated choropleth map shows population change across Japanese prefectures by year. A dropdown menu selects the year; the map transitions its color fill over two seconds to reflect the new population data. Built with D3 v3, the visualization uses `d3.geo.mercator` projection, `d3.geo.path` to render TopoJSON map features, and a linear color scale from white to blue. Population data from the Statistics Bureau is loaded from a TSV file.
AI-generated descriptionforked from <a href='http://bl.ocks.org/n1n9-jp/'>n1n9-jp</a>'s block: <a href='http://bl.ocks.org/n1n9-jp/0edd64c473e435245ace7946a8ffa268'>都道府県別 人口の推移</a>
forked from <a href='http://bl.ocks.org/kubosachi/'>kubosachi</a>'s block: <a href='http://bl.ocks.org/kubosachi/36ecf3d8d405be2dac585c88ea81ef35'>都道府県別 人口の推移</a>