Final Project Progress 5

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Final Project Progress 5

✓ Published1🌍 Public

Last edited Dec 12, 2025

Created on Dec 12, 2025

An interactive choropleth map of the United States visualizes the 2024 Boston Marathon finisher data, with each state’s circle size encoding the number of finishers while color darkness indicates the currently selected metric—number of finishers, average finish time, average age, or average second-half split difference. Using `d3.geoPath` and `d3.geoAlbers` to render state boundaries from TopoJSON and `d3.scaleLinear` for color mapping, the visualization loads finisher CSV data and state centers, enabling users to click legend items to switch between metrics, with hover tooltips and a dynamic color scale updating accordingly.

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MIT Licensed

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