Circles on a map

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Circles on a map

✓ Published1🌍 Public

Last edited Sep 30, 2020

Created on Sep 19, 2020

This example visualizes confirmed COVID-19 cases as of August 30, 2020, using scaled circles positioned at country centroids on a natural Earth projection. It renders an SVG world map with d3.geoPath, applies a d3.scaleSqrt for circle radii, and includes interactive pan/zoom via d3.zoom. A color legend uses d3.scaleOrdinal with schemeSpectral, while a separate size legend displays tick marks. Data comes from a CSV time series and TopoJSON world atlas, processed with topojson.feature, with hover tooltips showing country names and case counts.

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A bare minimum HTML page.

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