{"version":"1.0","type":"rich","title":"D3 Choropleth Starter","description":"A choropleth map of United States county unemployment rates, colored with a blue threshold scale. The map displays each county as a path, with hover tooltips showing the exact rate. The visualization loads county boundaries and unemployment data via Promises, then renders them using D3's `geoPath` and TopoJSON feature extraction. A legend with an axis shows the color scale, while state borders are drawn as a white mesh overlay.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/1dc27efeae6e4b9f8d723e4649699c13?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}