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Cesium is a WebGL virtual globe and map engine.


Our mission is to create the leading web-based globe and map for visualizing dynamic data. We strive for the best possible performance, precision, visual quality, ease of use, platform support, and content.


Lots of Satellites Lots of Sensors ISS, GeoEye, Landsat 7 BAMS C4ISR North Korea Launch Plan North Korea Launch Comparison US States (from KML) STS-122 ascent (from KML) Whale Shark Migration (from KML) Live-coding sandbox Documentation Cesium Viewer (empty)


Apache 2.0. Cesium is free for both commercial and non-commercial use.

Cesium Language (CZML)

CZML is a JSON-based language for describing time-varying values. It powers most of the above Cesium demos.

Check out the CZML Guide and the czml-writer library.

Get Started

Check out the wiki, including the quick start, architecture, roadmap, and contributor's guide.

Join our mailing lists:

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