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Sized Points on a Map
A world map displays COVID-19 cumulative cases for cities with populations over 50,000, using sized circles where radius encodes case count via a square-root scale. The visualization uses React with D3 v5 APIs including `geoNaturalEarth1`, `geoPath`, and `geoGraticule` to render country boundaries, graticules, and city points as SVG circles. Data comes from the World Health Organization via a CSV file, with country shapes from World Atlas TopoJSON.
AI-generated descriptionA 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.