map: usa, counties

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map: usa, counties

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Last edited Nov 8, 2020

Created on Nov 8, 2020

This example renders a choropleth-style map of the United States, displaying county and state boundaries overlaid on landmasses, with graticules and a sphere outline. It uses a React component with `d3.geoAlbersUsa` for projection and `d3.geoPath` for drawing geometries. Data comes from the US Atlas TopoJSON (`us-atlas@3.0.0/counties-10m.json`), processed with `topojson.feature` and `topojson.mesh`. Interactive tooltips show county and state names on hover. The SVG output is styled with semi-transparent fills and distinctive boundary strokes.

AI-generated description

A world map showing country boundaries from World Atlas TopoJSON, polished for visual style, including graticules.

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Datavis 2020 #29

MIT Licensed

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