{"version":"1.0","type":"rich","title":"Fork of Fork of D3 world map example with TopoJSON to GeoJSON and circular indicators","description":"This D3.js v4 world map visualizes birth rates per country using a Mercator projection, coloring each nation on a white-to-blue linear scale. The map draws country boundaries as SVG paths from a TopoJSON-to-GeoJSON dataset, with the `d3.geoMercator` and `d3.geoPath` APIs converting geographic coordinates into planar shapes. Circular indicators mark four specific cities—Fairbanks, Boston, Philly, and COS—positioned via the same projection. The choropleth colors are derived from a CSV file loaded through `d3.json` and `d3.csv` deferred queues.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/16395f8dc3f0400486d5624af14a95f6?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}