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Point size
A world map displays city populations as circles sized by a square-root scale. The visualization uses D3’s `geoNaturalEarth1` projection and `geoPath` for geographic features, with `scaleSqrt` mapping population values to circle radii. City coordinates come from a CSV, while land and country boundaries load from World Atlas TopoJSON. React handles component rendering, and D3’s `csv` and `json` fetch the data.
AI-generated descriptionWorld map loading geometry from World Atlas and city coordinates from csv, with point size based on city population.