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US Counties

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MMTClass
Last edited May 18, 2017
Created on May 18, 2017

This example shows a map of all US counties and state boundaries, rendered with a drop-shadow effect for visual depth. It displays the nation’s outline, state lines, and individual county borders using SVG paths. The code uses D3 v4’s `d3.geoAlbersUsa()` projection and `d3.geoPath` to draw the geography, while TopoJSON’s `topojson.feature`, `topojson.merge`, and `topojson.mesh` convert the county data from the provided JSON. A blurred filter and layered `use` elements create the shadow effect.

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