{"version":"1.0","type":"rich","title":"From Chen Ding: Aggregation by Country using Excel + Dropdowns!","description":"This example visualizes the number of video views for Harvardx/MITx online courses in 2013, with circles sized proportionally to view counts and positioned by geographic coordinates on a world map. A dropdown menu filters the view by specific course, and hovering over a circle reveals the country and total views. The map uses a Mercator projection via D3’s `geoMercator` and `geoPath` for landmasses and graticules, while `scaleSqrt` determines circle sizes. Data is loaded as CSV and TopoJSON, with the view rendered as React-driven SVG elements.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/562bdd8e42ec46989c2b6f26d3c1e7ee?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}