Circles on a Map

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Circles on a Map

✓ Published0🌍 Public

Last edited Oct 26, 2018

Created on Oct 26, 2018

This visualization shows global population estimates for 2018 as colored circles positioned at the geographic centroid of each country on a natural Earth projection. A size legend encodes population magnitudes, while a color legend maps a categorical scale, with countries lacking data highlighted in a different shade. The code uses d3.geoPath and d3.geoCentroid for map rendering, d3.scaleSqrt for circle sizing, and d3.scaleOrdinal with a spectral scheme for colors. Population data comes from a UN CSV dataset, joined to country geometries from a TopoJSON world atlas. Users can pan and zoom via d3.zoom, with hover tooltips showing region names and formatted population counts.

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