{"version":"1.0","type":"rich","title":"D3 Circles on a Map","description":"This visualization displays global population estimates for 2018 using circles positioned at country centroids on a natural Earth projection, rendered as an SVG. It uses `d3.geoPath` for map geography, `d3.geoCentroid` for circle placement, and `d3.scaleSqrt` to encode population via circle area. The code loads UN population data from a CSV and country boundaries from a TopoJSON file, styling countries and circles with CSS. A legend shows size scaling, and missing data is highlighted in red. Interactivity includes hover highlighting and zooming via `d3.zoom`.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/c5f7b0f28ef049c4bc3f68909c7fe644?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}