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30. Sized Points on a Map
A world map displays cities with populations over 50,000 as semi-transparent points sized by population using a square-root scale. The rendering combines country landmasses, interiors, and graticules from the World Atlas TopoJSON data, projected via `d3.geoNaturalEarth1` and drawn with `d3.geoPath`. City coordinates are projected and plotted as SVG circles whose radii derive from the population values loaded from a Simplemaps CSV.
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.