{"version":"1.0","type":"rich","title":"Circles on a Map","description":"This visualization displays global population estimates for 2018 as semi-transparent teal circles overlaid on a natural Earth projection map. The map uses a light gray sphere background, with countries colored light gray or pink to indicate missing data. Circle radius encodes population magnitude using a square-root scale, with a legend showing tick marks for population values. The example uses D3 v5 APIs including `geoPath`, `geoNaturalEarth1`, `scaleSqrt`, and `geoCentroid`, loading data from the UN population estimates CSV and a TopoJSON world atlas. Hovering a country reveals its population in a tooltip.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/1552d7fc7a574e4fb9bb6fa154c57bb0?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}