{"version":"1.0","type":"rich","title":"USA 2012 presidential election proportional circles (d3v3)","description":"This example uses proportional circles to visualize the results of the 2012 US presidential election at the county level. Circles are placed at each county’s centroid, with their radius scaled to the total number of votes cast, while the fill color encodes the Republican vote share using a blue-purple-red gradient. Counties are layered over a light gray map of the USA, created using the Albers equal-area conic projection via `d3.geo.albersUsa()`. The code loads county boundaries from a TopoJSON file and centroid data from a GeoJSON file, then uses `d3.select` and `d3.scale.sqrt` to generate the SVG circles.","provider_name":"VizHub AI Studio","provider_url":"https://next.vizhub.com","html":"<iframe src=\"https://next.vizhub.com/viz/gist-461d610e94d12d0a3cca8e530d3b03cd?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":500,"cache_age":3600}