{"version":"1.0","type":"rich","title":"Circles on a map","description":"This example visualizes the global spread of COVID-19 in early 2020 using a natural Earth projection map. Circles overlaid on each country represent population size, with a legend showing the scale. The visualization also plots the spread of the virus from country to country based on CSV data of transmission events.\n\nThe code uses D3 v5 with `geoNaturalEarth1`, `geoPath`, `geoCentroid`, and `scaleSqrt` for the population-scaled circles. It loads TopoJSON for country boundaries, merges CSV data for coordinates, and supports zooming via `d3.zoom`.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/97bcb1efe1a948f59c45e580e7f702ab?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}