Final Project Progress 3

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Final Project Progress 3

✓ Published2🌍 Public

Last edited Dec 12, 2025

Created on Dec 12, 2025

This interactive choropleth map visualizes 2024 Boston Marathon finisher data by state, showing participant counts, average finish times, average age, and first- versus second-half split times. The map uses d3.geoAlbers and d3.geoPath to render U.S. states from TopoJSON data, with d3.scaleLinear color scales encoding the selected metric. Hovering over a state displays a custom HTML tooltip with the detailed statistics. The code fetches external CSV data for state centers and finisher records, filtering out Puerto Rico and the U.S. Virgin Islands.

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MIT Licensed

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