With latitude and longitude coordinates, there are a number of ways to map geographic data using D3.js and Leaflet.
Leaflet
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Members Only
How to Make an Interactive Map of Geographic Paths
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Link
Crosslet
Crosslet is “a free small (22k without dependencies) JavaScript widget for interactive visualisation and analysis of geostatistical datasets.” It’s a combination of Crossfilter, Leaflet, and D3.