{"version":"1.0","type":"rich","title":"Circles on a Map","description":"This visualization displays global population by country as proportional circles positioned at each country’s centroid on a natural Earth projection. The circle area encodes 2020 population data from a CSV file, with countries lacking data shown in gray. Users can pan and zoom via d3.zoom, and hovering over a country reveals its name and population in a tooltip. The map uses d3.geoPath for geographic outlines, d3.geoCentroid for circle placement, and d3.scaleSqrt for sizing, with a custom size legend and color legend rendered in SVG.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/e9d9bc4107a24fccb91caea9b73547f0?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}