TopoJSON Layers

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TopoJSON Layers

✓ Published0🌍 Public

Last edited Feb 9, 2016

Created on Jun 4, 2013

This example animates the four layers of a U.S. TopoJSON map—a glowing land silhouette, a solid land fill, county boundaries, and state boundaries—by fading each SVG layer in and out in sequence. Using d3.geo.path with the Albers USA projection, the code fetches US GeoJSON data via d3.json and converts it with topojson.feature and topojson.mesh to render the paths. Each layer is styled with distinct SVG filters and strokes, and the cyclic animation is driven by chained transitions on the opacity property.

AI-generated description

Adding a little animation to the U.S. TopoJSON example to illustrate the different layers.

gpl-3.0 Licensed

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