{"version":"1.0","type":"rich","title":"Circles on a map","description":"This example visualizes global population data as semi-transparent circles positioned at the geographic centroid of each country on a Natural Earth map. Countries with missing data appear in light red, while the circles’ radii encode 2018 population figures using a square-root scale. The visualization uses d3.geoPath with the geoNaturalEarth1 projection, d3.zoom for panning and scaling, and d3.scaleSqrt for sizing. Data is loaded from a CSV file and a TopoJSON world atlas, processed via topojson.feature, with a custom legend built using d3.scaleSqrt.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/ef7f86901ec34782b1e874ef942f75f7?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}