{"version":"1.0","type":"rich","title":"Points on a map","description":"This example displays a world map with cities plotted as semi-transparent circles, where circle size reflects each city’s population. It uses a natural Earth projection via `d3.geoNaturalEarth1` and `d3.geoPath` to render land, graticules, and country borders from TopoJSON data. City coordinates and populations come from a CSV loaded with `d3.csv`, and circle radii are scaled with `d3.scaleSqrt`. The visualization is built with React hooks for data fetching and renders as SVG.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/df13814da81b408b9512ddc5a379b9c1?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}