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February 13, 2015

Augmented Reality Sandbox (Image 11)

A close-up of a virtual lake at rest in the augmented reality (AR) "Shaping Watersheds Interactive Sandbox." The water surface is not still because residual noise in the Microsoft Kinect 3D camera's depth measurements constantly agitates the water. Unless surface updates are temporarily turned off, the water simulation behaves as if there were constantly ongoing, small-scale earthquakes. (Note: White spots are individual grains that are reflecting projector light directly into the camera.) [Image 11 in a series of 19 images showing the process involved in creating the AR sandbox from start to finish, and the end product in use. See Image 12.]

More about this image
The AR sandbox was created by the University of California (UC), Davis', Tahoe Environmental Research Center (TERC) and the UC-Davis W.M. Keck Center for Active Visualization in the Earth Sciences (KeckCAVES) as part of the National Science Foundation-supported LakeViz3D project in which researchers create 3D visualization applications to teach Earth science concepts. Partnering institutions include UC-Berkeley's Lawrence Hall of Science and the ECHO Lake Aquarium and Science Center in Burlington, Vermont.

The LakeViz3D project seeks to raise public awareness and increase understanding and stewardship of freshwater lake ecosystems and Earth science processes using immersive, 3D visualizations of lake and watershed processes, supplemented by tabletop science activity stations that can be used, for example, in science centers and museums.

Among the activities developed by LakeViz3D is the "Shaping Watersheds Interactive Sandbox," a hands-on exhibit that combines a real sandbox with virtual topography and water, created using a closed loop of a Microsoft Kinect 3D camera, powerful simulation and visualization software, and a data projector. Users create topography models by shaping real sand, which is then augmented in real time by an elevation color map, topographic contour lines and simulated water. The system teaches geographic, geologic and hydrologic concepts such as how to read a topography map, and the meaning of contour lines, watersheds, catchment areas, levees, etc.

In May 2013, the ECHO Lake Aquarium and Science Center was the first science center to create and share a publicly accessible version of the AR sandbox.

"It's a teaching tool for all ages," said TERC director Geoffrey Schladow. "Usually, when you talk to kids about topography or what a contour line means, they're asleep in 30 seconds. With this exhibit, they're playing around, seeing the topographic map and watching how water flows downhill and where it goes. It becomes a game, and they've done it without really knowing they've learned something."

The sandbox was created by a UC-Davis team, led by KeckCAVES associate research scientist Oliver Kreylos, after being inspired by a video created by a group of Czech researchers who demonstrated in 2011 a prototype of an AR sandbox that used color mapping and a limited form of fluid flow. The team took the basic idea of capturing a sand surface with a 3D camera and projecting a colored image depicting elevation back onto the sand, then added a realistic water simulation and elevation contour lines to make the sandbox look more like a printed topographic map.

Further information about the AR sandbox including videos of the AR process in action is available on Kreylos' website. [Research supported by NSF grant DRL 11-14663.] (Date of Image: 2012-2013)

Credit: Oliver Kreylos, UC-Davis KeckCAVES

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