{"version":"1.0","type":"rich","title":"circles on a map","description":"This map uses D3 v5 to display country populations in 2020 as circles overlaid on a geographic projection. The base map is drawn with `d3.geoPath` and a natural Earth projection, while circle radii are scaled using `d3.scaleSqrt` based on population data. Countries lacking population data are filled red. Data comes from a United Nations population CSV joined with TopoJSON world map geometry. An interactive zoom feature is implemented via the `d3.zoom` API.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/6cc95ebd48a940c4a060c1f7eeed50b7?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}