Sophie's version: Aggregation by Country using Excel + Dropdowns!
This example visualizes video views for HarvardX/MITx online courses in 2013, aggregated by country on a world map. Circles sized by `d3.scaleSqrt` represent total views per location, with a dropdown menu to filter by individual course. Data is loaded via `d3.csv` from a gist, while geographic boundaries come from World Atlas TopoJSON. The map uses a Mercator projection via `d3.geoMercator` and `d3.geoPath`, with graticules and land masses rendered as SVG paths, and tooltips show course and view counts.
AI-generated descriptionThis is a visualization of the Harvardx/MITx Course-Person Dataset for the academic year 2013. The data shows the number of video views of the online courses, represented by the circles on the map. The data can be found here.
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The world map behind the points is a Mercator type map using the World Atlas TopoJSON. The points are off by a small fraction (down and to the left) however it fits much better on the Mercator projection over the Natural Earth projection. When the user hovers over each point, they can see the latitude and logitude of that deployment.