{"version":"1.0","type":"rich","title":"Fork of D3 Starter","description":"This fork of D3 Starter uses SVG rendering to display a choropleth map of US counties with bubble overlays sized by population. The visualization loads TopoJSON geographic data and renders county boundaries, internal state lines, and semi-transparent red circles at each county centroid where circle radius is scaled by the square root of population using `d3.scale.sqrt`. Interactive tooltips on hover reveal county names and population values. The code uses `d3.geo.path` for geographic projection and `topojson.mesh` for state borders, with `d3.select`, `.data()`, `.enter()`, and transition methods for dynamic styling. A YouTube tutorial link is embedded in the README.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/1d22713eb0ef4dd288d43ff8fba0727f?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}