{"version":"1.0","type":"rich","title":"Circles on a Map","description":"This example visualizes global population estimates for 2018 using circles overlaid on a natural Earth projection map. Countries with missing data appear pink, while populated areas are gray with semi-transparent cyan circles sized by population via d3.scaleSqrt. The visualization includes an interactive size legend with formatted tick values and a color legend. It uses d3.geoPath, d3.geoCentroid, d3.zoom, and d3.scaleOrdinal, rendering with SVG. Population data comes from a UN CSV file joined to TopoJSON world geometry, with tooltips showing country names and population counts.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/0b6c5e232d1a41cf936a95c256171f55?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}