{"version":"1.0","type":"rich","title":"Circles on a map","description":"This example visualizes COVID-19 case counts by country on a natural Earth projection map, with circles sized by total cases as of May 16, 2020. Using d3.geoNaturalEarth1 and d3.geoPath, it renders country outlines and positions proportional circles via d3.geoCentroid. A d3.scaleSqrt maps case numbers to circle radii, and a custom size legend (with d3.format) explains the scaling. The map supports zooming through d3.zoom, while country data is joined from a CSV file and TopoJSON world-atlas geometry.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/8acef2ffdb4e4f6db36ff78a75830339?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}