Visualizing Population Centers

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Visualizing Population Centers

✓ Published1🌍 Public

Last edited Jul 13, 2024

Created on May 5, 2024

This visualization displays world population density through colored contour layers on a Natural Earth projection map. City population data from the Simplemaps World Cities Database is weighted to compute density contours using `d3.contourDensity`. Colors interpolate between `interpolateCubehelixDefault` and `interpolateReds` based on density values, rendered via `d3.geoPath` with land clipping. The map supports zooming through `d3.zoom` and includes city labels for populations above seven million.

AI-generated description

A world map showing estimated population density contours. Computed from Simplemaps: World Cities Database, weighted using city populations. Contours and density estimation computed by d3-contour. Has zooming too!

The colors are computed by interpolating between the CubeHelix and Reds color scales. The interpolation is based on the estimated population density where the CubeHelix color scale is used at the first level of density, and as the density increases the colors loop around the red spectrum, using the Reds color scale. This technique is used to visually represent varying levels of density on the map.

Challenges

Create a color legend
Make this work with globe-based panning and zooming

MIT Licensed

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