{"version":"1.0","type":"rich","title":"Circles on a Map","description":"This visualization maps UK higher education providers as circles on a natural Earth projection, with circle area proportional to each provider’s student population. Users can pan and zoom the map and hover over country paths to see tooltips. The code combines `d3.geoPath` for geographic outlines, `d3.geoCentroid` for positioning circles, and `d3.scaleSqrt` for sizing, while `d3.zoom` enables interaction. Data comes from a CSV joined to world-atlas TopoJSON, with a custom size legend built using D3 scales.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/4a24b47f08ae4adbb612d23399d0b18c?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}