Final Project Progress 4

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Final Project Progress 4

✓ Published1🌍 Public

Last edited Dec 12, 2025

Created on Dec 12, 2025

This interactive choropleth map visualizes 2024 Boston Marathon finisher data across U.S. states, with a clickable legend to toggle between four metrics: number of finishers, average finish time, average age, and average second-half split difference. The map uses D3’s `geoAlbers` projection and `geoPath` to render state boundaries from TopoJSON via `topojson-client`, while CSV data is parsed with `csvParse`. Hover effects and a tooltip are implemented with D3 selections, and color scales from `scaleLinear` update state fills dynamically.

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MIT Licensed

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