{"version":"1.0","type":"rich","title":"Circles on a Map","description":"This visualization displays the population of each country in 2018 using circles overlaid on a natural Earth map, with circle area proportional to population via a square root scale. Users can pan and zoom the map and hover over countries to see exact population values. Built with D3 v5, it uses `d3.geoPath` and `geoNaturalEarth1` for map rendering, `d3.zoom` for interaction, and `d3.scaleSqrt` for the size legend. Population data is loaded from a CSV file and joined to TopoJSON country boundaries.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/e3ff44175409415882124078dfab55fc?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}