Testing d3.js in Leaflet.js

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Testing d3.js in Leaflet.js

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Last edited Jul 11, 2012

Created on Jul 11, 2012

This example combines D3.js with Leaflet to render a geographic visualization of taxon observation counts. D3.js selects the SVG element created by Leaflet and appends a group, then loads GeoJSON data and adds a circle for each feature. The circles’ radii are scaled by the `count` property, initially set relative to the data and adjusted dynamically on map zoom via the `update()` function, which converts geographic coordinates to pixel positions using Leaflet's `latLngToLayerPoint`. A red border on the SVG and group elements highlights the integration of D3's data-binding with Leaflet's map interaction.

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