{"version":"1.0","type":"rich","title":"25_Circle on a Map","description":"A world map displays population estimates for 2018 using circles sized by a square-root scale, positioned at each country’s geographic centroid via `d3.geoPath` and `geoCentroid`. The choropleth base distinguishes missing data in pink, while hover reveals country names and populations. Built with D3 v5, it layers a zoomable natural Earth projection, a color legend for categorical fills, and a size legend using `d3.scaleSqrt`, with data from UN population estimates and TopoJSON world atlas.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/1afa7bef70de41bcba8ea372bd9a5d30?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}