{"version":"1.0","type":"rich","title":"Circles on a map","description":"This map visualizes global population data for 2018, overlaying semi-transparent circles on a natural Earth projection. Countries without data appear in light red, while those with values are gray and display proportional circles positioned at their centroids. The visualization uses D3 v5 with `geoNaturalEarth1`, `geoPath`, `geoCentroid`, and `scaleSqrt` for sizing, plus `topojson` for world geometry. Hovering reveals a tooltip with the region name and formatted population. A size legend explains circle scaling, and zooming is enabled via `d3.zoom`.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/d2182048dbd44e6d93c5cded9a465632?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}