# CesiumGS/cesium

An open-source JavaScript library for world-class 3D globes and maps :earth_americas:

Repository: https://github.com/CesiumGS/cesium
Canonical: https://ross.abutalabs.com/products/cesium
Homepage: https://cesium.com/cesiumjs/
Language: JavaScript
License: Apache-2.0
License Family: permissive
Topics: 3d, geospatial, gis, 3d-tiles, cesium, 3d-globe, gltf, czml, webgl
Last push: 2026-08-26T21:52:51+00:00

## Health v2 (maintenance only)
Score: 98/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 96, longevity 100
- inputs: {"age_days": 5297, "days_push": 7, "days_rel": 29, "gap_med": 29, "n_releases_24m": 26}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 15606, forks 3854 (observed 2026-08-28T04:11:12.847665+00:00)

## What it is
CesiumJS is an open-source JavaScript library for rendering high-precision 3D globes and 2D maps in the browser using WebGL. It supports streaming 3D Tiles, terrain, imagery, glTF models, and time-dynamic geospatial data at massive scale.

## Use cases
- render a 3d globe in a web app
- visualize 3d buildings and photogrammetry with 3d tiles
- stream terrain and satellite imagery layers in the browser
- display time-dynamic flight or vehicle telemetry on a map
- load kml geojson or czml geospatial data
- build a smart city or drone tracking dashboard
- view gltf 3d models on a globe

## When to choose
- you need high-precision WGS84 3D globe rendering in the browser
- you must stream massive 3D Tiles, terrain, or imagery datasets
- you need time-dynamic 4D visualization of geospatial data
- you want an Apache-2.0 library with commercial-friendly licensing

## When to avoid
- you only need simple 2D slippy maps without 3D (Leaflet or MapLibre may suffice)
- you need offline desktop GIS analysis rather than web visualization
- you cannot rely on any network tile or terrain streaming sources

## Facets
- artifact type: library
- maturity: stable
- function: data-visualization, graphics, geospatial, charts
- domain: web-development, frontend, data-visualization, simulation
- platform: browser, cross-platform
- tags: 3d-globe, webgl, 3d-tiles, gltf, czml, virtual-globe, terrain, imagery, gis, time-dynamic, geospatial, maps, web-server, nodejs

## Member repositories
- CesiumGS/cesium (main) score 98

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:12.847665+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:05:37.658090+00:00, confidence not recorded.
  - readme: https://github.com/CesiumGS/cesium (fetched 2026-08-28T04:11:12.847665+00:00, sha 0659190f4a3f)
  - homepage: https://cesium.com/cesiumjs/ (fetched 2026-08-29T08:04:03.574596+00:00, sha cf0c3ed19c17)
  - site_page: https://cesium.com/about (fetched 2026-08-29T08:04:03.587018+00:00, sha 8f94f5857d5a)
  - site_page: https://sandcastle.cesium.com/?src=Geometry+and+Appearances.html (fetched 2026-08-29T08:04:03.584590+00:00, sha 6a3ff56ec718)
- Data as of 2026-08-30T08:39:29.467469+00:00.