{"version":"1.0","type":"rich","title":"Circles on a map","description":"This visualization displays world population data for 2018 using circles positioned at country centroids on a natural Earth projection map. Countries lacking data are tinted pink, while those with values appear gray with teal, semi-transparent circles scaled by square-root transformation. The map uses `d3.geoPath` and `d3.geoNaturalEarth1` for projection, and interactive zoom via D3's `zoom` event. Population figures are loaded from a CSV via `d3.csv`, joined to TopoJSON country shapes transformed with `topojson.feature`, and a custom legend illustrates circle size.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/db67b6864619456291b4b158b6b4b6a9?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}