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Proportional Symbols Map in D3

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Kkfhujosefsson@dons.usfca.edu
Last edited Apr 23, 2025
Created on Apr 16, 2025

A proportional symbols map visualizes transportation cost indices across U.S. states using D3.js and the topojson library. Each state is rendered as a gray polygon with a circular symbol whose size corresponds to its cost value. The visualization employs an Albers equal-area projection via `d3.geoAlbersUsa` and `d3.geoPath`, with state centroids hardcoded to position the proportional circles. Interactive tooltips appear on hover, while symbols animate on load. The map is drawn in SVG with data fetched from a CSV hosted on GitHub.

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MIT Licensed

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