{"version":"1.0","type":"rich","title":"Circles on a map","description":"This visualization displays a world map with circles sized by population estimates for 2018, using a square-root scale to encode magnitude. Countries without data appear in red, while those with values are green. The code uses `d3.geoNaturalEarth1` for projection, `d3.geoPath` to render country boundaries, and `d3.geoCentroid` to position circles. A size legend and a color legend are generated with custom D3 functions, while zoom interaction is implemented via `d3.zoom`. Population data comes from a CSV of UN estimates, merged with TopoJSON world atlas geometry.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/b7cab95feed3412cacc4b878adc8e2b1?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}