Screenshot of WorldWind showing Blue Marble Next Generation layer
|Developer(s)||Ames Research Center (NASA)|
|Written in||C#, Java|
|Type||Virtual globe software development kit|
|License||NASA Open Source Agreement v1.3|
WorldWind is an open-source (released under the NOSA license) virtual globe. It was first developed by NASA in 2003 for use on personal computers and then further developed in concert with the open source community since 2004. As of 2017, a web based version of WorldWind is available online. An Android version is also available.
The original version relied on .NET Framework, which ran only on Microsoft Windows. The more recent Java version, WorldWind Java, is cross platform, a software development kit (SDK) aimed at developers and, unlike the old .NET version, not a standalone virtual globe application in the style of Google Earth. The SDK includes a suite of basic demos, available at goworldwind.org. The WorldWind Java version was awarded NASA Software of the Year in November 2009. The program overlays NASA and USGS satellite imagery, aerial photography, topographic maps, Keyhole Markup Language (KML) and Collada files.
Though widely available since 2003, WorldWind was released with the NASA Open Source Agreement license in 2004. The latest Java-based version (2.1.0), was released in December 2016. As of 2015 a web based version of WorldWind is under development and available online. An Android version is also available.
The previous .NET-based version was an application with an extensive suite of plugins. Apart from the Earth there are several worlds: Moon, Mars, Venus, Jupiter (with the four Galilean moons of Io, Ganymede, Europa and Callisto) and SDSS (imagery of stars and galaxies).
Users could interact with the selected planet by rotating it, tilting the view, and zooming in and out. Five million place names, political boundaries, latitude/longitude lines, and other data can be displayed. WorldWind.NET provided the ability to browse maps and geospatial data on the internet using the OGC's WMS servers (version 1.4 also uses WFS for downloading place names), import ESRI shapefiles and kml/kmz files. This is an example of how WorldWind allows anyone to deliver their data.
The resolution inside the US is high enough to clearly discern individual buildings, houses, cars (USGS Digital Ortho layer) and even the shadows of people (metropolitan areas in USGS Urban Ortho layer). The resolution outside the US is at least 15 meters per pixel.
WorldWind uses digital elevation model (DEM) data collected by NASA's Shuttle Radar Topography Mission (SRTM), National Elevation Dataset (NED) and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER). This means one can view topographic features such as the Grand Canyon or Mount Everest in three dimensions. In addition, WW has bathymetry data which allows users to see ocean features, such as trenches and ridges, in 3D.
Many people using the applications are adding their own data and are making them available through various sources, such as the WorldWind Central or blogs mentioned in the link section below.
All images and movies created with WorldWind using Blue Marble, Landsat, or USGS public domain data can be freely modified, re-distributed, and used on web sites, even for commercial purposes.
Add-ons and plugins
WorldWind can be expanded by using one of many add-ons - small extensions that add new functionality to the program.
Possible types of add-ons:
- Point layers - simple XML files displaying placemarks (point of interest) as icons
- Trail layers - paths (routes, boundaries)
- Line features - XML with a list of points visualized as a line or wall
- Polygon features - XML with a list of points visualized as a filled polygon (flat or extruded)
- Model features - XML used to load 3D textured meshes
- Place names - specific points (such as cities, hills and buildings) that are assigned text labels
- Image layers - high resolution imagery for various places in the world
- Scripts - files that control camera movement
The original recipe for WorldWind was restricted to Windows, relying on the .NET libraries and DirectX. A new SDK version has been developed in Java with JOGL referred to as WorldWind Java. The latest version (2.1.0) was released in December 2016.
This new version has an API-centric architecture with functionalities 'off-loaded' to modular components, leaving the API at the core. This makes WorldWind itself a plugin, so that it can be used as interchangeably as possible (for example via Python). This refactoring exercise allows WorldWind to be accessed via a browser as a Java Applet. A preview of the WorldWind Java SDK was released on May 11, 2007 during Sun Microsystem's annual JavaOne conference.
Since WWj is an SDK, there is no single application; instead there are any number of applications using WWj, each with different functionalities, created by government agencies and commercial developers from around the world. These applications include simple virtual globe viewers, satellite tracker, GIS platforms, photo editor, F-16 simulator, mission planning software and many more.
- NASA WorldWind SDK Tutorial: This Tutorial was developed by the Institute for Geoinformatics from the University of Münster, Germany. It contains tutorials from setting up an Eclipse environment with the WorldWind API to building polygons from Linked Open Data geographic datasets. It contains important tips from beginners to advanced developers.
Forks and clones
- Geoforge project contains a fork of the NASA WorldWind project. Geoforge provides open source software. It leads in a platform that manages geosciences data and uses WorldWind features to provide a display of geo-localised geosciences objects.
- Dapple is a fork of the NASA WorldWind project, it is an Open Source project created by developers at Geosoft. Dapple is aimed at geoscience professionals, and has features aimed at them, such as easy addition of WMS servers and a simpler UI very similar to Google Earth's.
- SERVIR-VIZ is a customized version of WorldWind developed by IAGT for the SERVIR project.
- WW2D was a cross-platform, free and open-source application based on Java and OpenGL technologies and can be run on Microsoft Windows, Mac OS X, Linux (x86 and x86-64) and Solaris on SPARC. WW2D uses images from WorldWind's servers.
- WW2D Plus One - an update to WW2D providing a 3D view.
- Punt was a fork of the NASA WorldWind project, and was started by two members of the free software community who had made contributions to WorldWind. Punt was based on the code in WorldWind 1.3.2, but its initial release has features not found in WorldWind 1.3.2 or 1.3.3 (such as support for multiple languages). Currently, Punt is only available for Windows, but long-term goals include a desire to move to a cross-platform solution.
Low resolution Blue Marble datasets are included with the initial download; as a user zooms into certain areas, additional high resolution data is downloaded from the NASA servers. The size of all currently available data sets is about 4.6 terabytes.
- Animated data layers
- Image/terrain datasets
- Blue Marble Next Generation imagery
- Landsat 7 imagery
- USGS imagery
- Zoomit! imagery (community produced layer)
- SRTM (SRTM30Plus/SRTMv2/USGS NED) terrain data (includes bathymetry)
- MOC (Mars Global Surveyor - Mars Orbiter Camera)
- MOLA (MGS - Mars Orbiter Laser Altimeter hypsometric map)
- THEMIS (Mars Odyssey - Thermal Emission Imaging System)
- MDIM (Viking - Mars Digital Image Model)
- Magellan Imaging Radar (Color/Greyscale)
- Hypsometric Map
Sloan Digital Sky Survey
- Survey Imagery
- Footprint Imagery
- SDSS Footprint
- FIRST (Faint Images of the Radio Sky at Twenty-cm) Footprint
- Baseline resolutions
- 500 m (Blue Marble Next Generation)
- 15 m (Landsat imagery; except for polar areas)
- Typical high resolutions
- New Zealand
- Zoomit! (from LINZ data): 2.5 m (colour and grayscale)
- Western Australia
- Zoomit! (from GSWA): 250K surface geology mosaic, 250K topographic data, Magnetic Intensity, Bouger Gravity
- South Africa
- Zoomit!: Spot5 10m (colour near full coverage), Robben Island 0.5 m, Johannesburg 2.5 m
- Altitude resolution
- U.S.: 30 m (1 arcsecond; USGS NED)
- Global: 90 m (3 arcseconds; SRTM)
- Oceans: 2 arcminutes and better
- Some USGS aerial images were taken in the early 1990s.
- Landsat 7 images are all taken after 1999 (except for Geocover 1990).
- "World Wind Explorer". explorer.worldwind.earth.
- "WorldWindAndroid github repository".
- "goworldwind.org". goworldwind.org.
- "Software of the Year Award, WorldWind Java". nasa.gov. December 24, 2009.
- "v2.1.0". Retrieved April 25, 2017.
- Schubert, Bruce. "World Wind Explorer". explorer.worldwind.earth.
- "NASAWorldWind/WorldWindAndroid". Retrieved April 25, 2017.
- "Virtual Earth". worldwindcentral.com.
- "Demos". goworldwind.org.
- Geoforge project. "Geoforge - home". geoforge.org.
- Geoforge project. "Geoforge - software platform". geoforge.org.
- "Dapple Earth Explorer: Map and View the Earth". geosoft.com. Archived from the original on 2006-08-13.
- "Downloads - IAGT, The Institute for the Application of Geospatial Technology, Auburn, New York". iagt.org.
- "GLOBE". worldwindcentral.com.
- "Land Information New Zealand (LINZ)". Land Information New Zealand (LINZ).
- "Archived copy". Archived from the original on 2007-02-08. Retrieved 2007-02-07.
- David Sandwell, Satellite Geodesy, IGPP, SIO, University of California San Diego. "Satellite Geodesy, IGPP, SIO, UCSD - Global Topography - SRTM30, Multibeam, & predicted". ucsd.edu.
- "The VLA FIRST Survey". stsci.edu.
- "USGS Urban Areas". worldwindcentral.com.
- "Add-on:ZoomIt!". worldwindcentral.com.
- "Spot5 Imagery". madmappers.com.
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