WebGL Virtual Globe and Map Engine

AGIT 2017, Cesium Version 1.35

Emmanuel Belo emmanuel.belo@camptocamp.com +41 21 619 10 25 @emmanuel_belo

www.camptocamp.com

Camptocamp

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Camptocamp

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CesiumJS

● Javascript Software using WebGL○ 3D virtual globe○ 2D map○ 2.5D Oblique

● 3D Tiles● Different Terrain elevation profile sources● Time-dynamic Scene with CZML● Overlays:

○ Raster: WMS, TMS, OSM, Bing & Esri○ Vector: glTF, CZML, KML, Shapefiles

● Extensible with plugins

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Web Graphics Library

● Javascript API for rendering interactive 2D/3D graphics within the web browser

● Hardware acceleration using the Graphics Processing Unit (GPU)WebGL Programs consist of :○ Control code written in Javascript (CPU) and ○ Shader code that is executed on a computer's GPU

● No Plugin ! Also in IE11 !!!● Mobile device compatible

○ iPhone/iPad○ Samsung Sx

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WebGL availability

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Terrain Tiles

Stream high-resolution global terrain using the open quantized-mesh format or traditional height-maps, or plug in your own.

quantized mesh VS height-mapssrc: http://blog.mastermaps.com/2014/10/3d-terrains-with-cesium.html

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Quantized Mesh

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High precise DEM (quantized mesh)

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Imagery layers

● Stream imagery using a wide array of open standards and custom tiling schemes.

● Examples:○ Web Map Service (WMS) - OGC○ Web Map Tile Service (WMTS) - OGC○ Tile Map Service (TMS)○ OpenStreetMap or any sleepy map○ Bing Maps - Uses Bing Maps REST Services to access tiles○ Esri ArcGIS MapServer - Uses the ArcGIS Server REST API○ Mapbox - Uses the Mapbox API to access tiles○ Standard image files - Create a tile from a single georeferenced image

○ Custom tiling schemes - Using UrlTemplateImageryProvider, we can connect to a wide array of imagery sources by using a URL template.

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WMTS dedicated background map

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3D Models

Visualize 3D models using glTF, the runtime asset format for WebGL.

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graphic language Transmission Format

● JSON used to describe node hierarchy● Node hierarchy refers to EXTERNAL binary asset blobs

○ Geometry, Texture, Material● Non-compressed asset blob format

○ Direct load in WebGL● Extensible

○ Streaming and compression

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3D Tiles

Use 3D Tiles to stream, style, and interact with heterogeneous 3D data, including photogrammetry models, 3D buildings, CAD and BIM exterior and interiors, and point clouds.

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Vectors and geometry

Load KML, GeoJSON, TopoJSON, and CZML. Use the Cesium API directly to draw a wide array of features and geometries.

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Clustered POIs overlays (geoJSON)

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Time-dynamic visualization

See our first-class support for high-fidelity time-dynamic simulation, real-time telemetry streaming, and 4D visualization.

http://apps.agi.com/SatelliteViewer/?Status=Operational 17

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Cesium Sandcastle

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3D Web Expectation (2014)

● 3D Scenes○ Aerial imagery and terrain○ Buildings with textures○ Label and marker○ Rich interaction (Navigate, pick, popup, measure, usw.)○ Global perimeter, higher local resolution

● Technology○ Web (no plugin), Cross Platform and Cross Device○ Open Standards and Formats○ Open Source

● 2D-3D seamless transition

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ol-cesium

● Write once, use in 2D and 3D● Receive and share with the community● Easiest way to add 3D to an OpenLayers 3 map● Start interacting in one world and continue in the other● It literally brings a new dimension to your maps

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OpenLayers - Cesium integration library

● Create your map using OpenLayers, and visualize it on a globe with Cesium.

● Switch smoothly between 2D and 3D and synchronize:○ Map context (bounding box and zoom level);○ Raster data sources;○ Vector data sources in 2D and 3D;○ Map selection (selected items).

● The library is configurable and extensible and allows:○ Lazy or eager loading of Cesium○ Limiting Cesium resource consumption (idle detection)

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Switzerlandmobility (2D)

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Switzerlandmobility (3D)

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ol-cesium

● Custom 3D terrain - different projections● Optimized for lots of users● CPU/GPU resource saving by stopping the render loop● Workaround for lines on terrain

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ol-cesium

● Vector clustering: top quality, some geojsons instead ofmillions of raster tiles

● 3D vector clustering with 30'000 points● Fog: reduce details, improve performance

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Topographical catchment areas of Swiss waterbodies

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swissBUILDINGS3D

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ol-cesium

● Lazy loading● 3D tiles: buildings, bridges● Own synchronizers (raster => vector, different projections)● Immersive views

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Meet the community

● Main website: http://www.cesiumjs.org● GitHub:

○ https://github.com/AnalyticalGraphicsInc/cesium○ https://github.com/openlayers/ol-cesium

● Mailing lists: https://groups.google.com/forum/#!forum/cesium-dev ● Twitter: @CesiumJS

● Professional Services: http://www.camptocamp.com/en/solution/virtual-globe-3d/

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