Choropleth Map with Interactive Filtering

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Choropleth Map with Interactive Filtering

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Last edited Jun 30, 2020

Created on Jun 30, 2020

This example presents a choropleth map of world countries colored by economic classification, with an interactive legend that filters the map's display. Clicking a legend category highlights matching countries while dimming others; clicking again clears the filter. The visualization uses D3 v5's `geoNaturalEarth1` projection with `geoPath` for rendering, and `scaleOrdinal` with `schemeSpectral` for color mapping. Pan and zoom are enabled via `d3.zoom`. Geographic data comes from the World Atlas TopoJSON dataset, loaded and processed with `topojson.feature` and merged with TSV metadata.

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A bare minimum HTML page.

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