{"version":"1.0","type":"rich","title":"Circles on a Map","description":"This example visualizes global population by country, with circle area encoding 2018 population values on a natural Earth projection. Users can pan and zoom the map, and hovering over countries reveals more details via tooltips. The visualization uses d3.geoPath for map rendering, d3.scaleSqrt for proportional circle sizing, and d3.zoom for interactive navigation. Data comes from a CSV file joined with TopoJSON world geometry, while d3.scaleOrdinal and size legends explain the visual encoding.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/b634bf1b400e4e85b5047f00c3f1e820?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}