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Sized Points on a Map
This example displays a world map with city points sized by population, using a square-root scale to encode population values as circle radii. The visualization combines geographic context from World Atlas TopoJSON data with city data from Simplemaps, rendering both through React and SVG. The code uses d3.geoNaturalEarth1 for projection, d3.geoPath for country boundaries and graticules, and d3.scaleSqrt for sizing, with translucent Cornsilk circles overlaid on dark landmasses and green borders.
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.