{"version":"1.0","type":"rich","title":"Mercator Map with Bubbles","description":"A world map rendered as a light blue Mercator projection with black country borders, overlaid with orange bubbles that summarize attendance at World Cup matches by year. Each bubble is positioned at the average coordinates of the matches in that year, and its size encodes the total attendance using a square-root scale. The visualization uses D3 v3 to load GeoJSON country boundaries and a TSV dataset of match locations, aggregates attendance by year via nested rollups, and plots the resulting bubbles on an SVG map.","provider_name":"VizHub AI Studio","provider_url":"https://next.vizhub.com","html":"<iframe src=\"https://next.vizhub.com/viz/gist-2cb3ece6836b7ab93289150ff44a2cf2?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":500,"cache_age":3600}