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Circles on a map

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VVaggelisKlt
Last edited Aug 31, 2020
Created on Aug 31, 2020
Forked from Circles on a map

This example visualizes the global spread of COVID-19 cases on a date in August 2020, plotting semi-transparent red circles on a natural Earth projection map. Circle size encodes case counts using a square-root scale, while hover tooltips show country names and totals. Built with React and D3 v5, it uses `d3.geoNaturalEarth1`, `d3.geoPath`, `d3.geoCentroid`, and `d3.zoom` for navigation, with TopoJSON world data and CSV time-series data from a COVID-19 repository. Custom legends display color and size scales via `d3.scaleOrdinal` and `d3.scaleSqrt`.

AI-generated description

A bare minimum HTML page.

See also React Starter.

MIT Licensed

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