{"version":"1.0","type":"rich","title":"Circles on a Map","description":"This interactive visualization displays global population estimates for 2018 as proportional circles centered on each country, overlaid on a natural Earth projection map. The map uses D3 v5’s `geoPath` and `geoNaturalEarth1`, while circle radii are scaled with `scaleSqrt` based on UN population data. A zoom behavior lets viewers pan and scale the map, and a custom size legend with tick labels explains the scaling. Countries without data appear in a distinct color, and hovering reveals country names and population figures via SVG `<title>` elements.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/f71db40b5dd24f6b8e51f8e6f51c17a3?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}