{"version":"1.0","type":"rich","title":"Circles on a Map","description":"This visualization uses the D3.js framework to display the global population of each country as a circle on a natural Earth projection map; the circle's area corresponds to the country's 2018 population, using a square-root scale for size. The map supports pan and zoom interactions via `d3.zoom`, and hovering over a country reveals its population and region via a tooltip. Countries lacking data are highlighted in red, and the visualization includes a color legend and a size legend built with SVG, with data sourced from a COVID-19 dataset and a TopoJSON world atlas.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/1ded1caa9f2144b2940250c89cc5d589?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}