{"version":"1.0","type":"rich","title":"Circles on a Map","description":"This visualization maps global population by country using proportional circles centered on each nation’s geographic centroid. The area of each circle encodes the 2018 population estimate, with missing data shown in red on a gray map. Users can pan and zoom via d3.zoom, and hover over countries to reveal population values in tooltips. The code uses d3.geoPath, d3.geoNaturalEarth1, and topojson for map rendering, with a d3.scaleSqrt for circle sizing and a custom size legend.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/898915b28b5144e8b32fca3c6a15f855?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}