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There are now a wealth of useful, open-source JavaScript tools for handling advanced cartography and geospatial analysis. The tools I’ll cover are based on services such as Mapbox, CloudMade, and MapZen, but these are all modular libraries that can be added as packages to Node.js or used for analysis in a web browser. WebGL and HTML5 canvas have also opened up 3D techniques for web developers. The following libraries work with [GeoJSON](http://geojson.org/) formatted objects representing geographic space.