{"version":"1.0","type":"rich","title":"City density filtering by population and proximity","description":"This example displays a world map with cities filtered by population, showing only those with over 2 million residents as semi-transparent circles scaled by population size via `d3.scaleSqrt`. Geographic context comes from World Atlas TopoJSON, rendered using `d3.geoNaturalEarth1` and `d3.geoPath`. React manages the component state, fetching city data from an OpenStreetMap CSV through a custom `useCities` hook, while the `Marks` component renders the projected spheres, landmasses, and boundaries.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/85bda35ade5d4b37bf317545f4a731fe?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}