{"version":"1.0","type":"rich","title":"Circles on a Map","description":"This visualization displays the world’s population by country, with circle area scaled to each nation’s 2018 population, mapped onto a natural Earth projection using d3.geoNaturalEarth1 and d3.geoPath. A square-root scale (d3.scaleSqrt) determines circle radii, while a separate size legend communicates the mapping. Users can pan and zoom via d3.zoom, and hover over countries to reveal a tooltip with the region and population count. The code uses D3 v5, TopoJSON for world geometry, and CSV data from the United Nations, with an SVG rendering approach.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/565755271482451ba0dae20b7c1c1b86?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}