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Last edited May 23, 2020

Created on May 23, 2020

This example displays a world map with cities whose populations exceed 50,000, using circles sized by population via a square-root scale. It renders country boundaries and graticules using `d3.geoPath` with TopoJSON data from World Atlas, while city locations come from the Simplemaps World Cities Database. The React app uses `useWorldAtlas` and `useCities` custom hooks to load data, then passes a size scale and value accessor to a `Marks` component that draws the SVG output.

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A world map showing cities with population greater than 50,000. City data from Simplemaps: World Cities Database.

Country boundaries from World Atlas TopoJSON, polished for visual style, including graticules.

MIT Licensed

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