{"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 the 2013 academic year. Circles, sized by total views, are positioned on a world map according to viewer location, with a dropdown menu to filter by specific course. A tooltip reveals the country and view count for each circle. The visualization uses a Mercator projection via `geoMercator`, renders map features with `geoPath`, and calculates the circle sizing using `scaleSqrt` from D3 v5. The map data comes from the World Atlas TopoJSON, while view data is loaded from a CSV file.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/a1d76607b8de49fb8cb5872a2aa5a790?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}