{"version":"1.0","type":"rich","title":"Flow chart for the spread of COVID-19 across the world","description":"This visualization maps the global spread of COVID-19 during the early outbreak, showing direct transmission links between geographic coordinates. A Mercator projection with `d3.geoPath` renders country outlines, while an overlay of `LineString` paths connects origin and destination points, revealing propagation routes from Chinese provinces to Europe, Australia, and beyond. The code uses `d3.queue` with `d3.json` and `d3.csv` to load world GeoJSON and coordinate data, with `d3.geoMercator` projecting all coordinates. The resulting SVG uses a dark teal stroke for each transmission arc against a gray world map.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/2b7b6e1b309d45ec80b0a6545fd08a4e?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}