{"version":"1.0","type":"rich","title":"Circles on a map","description":"This map visualization displays the global population distribution for 2018 using circles sized by population count, placed at each country's geographic centroid over a natural Earth projection. The map uses `d3.geoPath` for rendering country boundaries and `d3.scaleSqrt` for circle sizing, with a legend showing population ranges. Users can zoom and pan using `d3.zoom`. Population data comes from a UN dataset (medium variant estimates), joined with TopoJSON world geometry via `d3.json` and `d3.csv`. A color legend marks missing data countries in red.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/461aecea499f4137bf09ecfd373e062e?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}