Eartha - DeLorme Headquarters, Yarmouth, ME
Posted by: 
RIclimber
N 43° 48.476 W 070° 09.846
19T E 406368 N 4851199
Eartha is a 3-dimensional scale model of our earth with mountains and landforms in full 3D, that rotates and revolves, simulating the earth’s real movements. Eartha was given the title of "World's Largest Revolving/Rotating Globe" in 1999.
Waymark Code: WM9D9E
Location: Maine, United States
Date Posted: 08/04/2010
Views: 69
Housed in a three-story glass atrium at the company's headquarters in Yarmouth, Maine, Eartha took two years to build and represents earth as it is seen from space. Every continent is beautifully detailed, with vivid colors illustrating all levels of vegetation, major roadways and cities. Ocean depths are also completely represented.
* The Data
The mapping data, which took over a year to compile, is completely unique. It is a special composite database built from satellite imagery, shaded relief, colored bathymetry (ocean depth data) and information from terrestrial sources, such as road networks and urban areas. The printed Eartha database is equivalent to about 140 gigabytes (or 214 CD-ROMs), making it one of the largest in the world! Its scale is 1:1,000,000, which works out to be one inch equaling nearly 16 miles. At this scale, California is three and a half feet tall!
* The Infrastructure
Eartha's "skeleton" is the Omni-Span™ Truss structure - a DeLorme-developed system of over 6,000 pieces of lightweight aluminum tubing. The "skin" is constructed of over 792 map sections, printed on special materials and mounted on lightweight panels. Those panels are then affixed to the structure with a unique bolt system. Each panel spans 8° latitude by 10° longitude.
* The Mechanism
Eartha tilts at 23.5 degrees, just as the earth does. It revolves on a specially designed cantilever arm and rotates on an axis. This action is powered by two electric-powered motors, which are commanded by a computer. One combined Eartha revolution and rotation occurs every minute at maximum speed.
-www.delorme.com
Stationary or rotating globe: Rotating
Historical or current information: Current
Surface (elevation) relief: yes
Size: 41.5 feet
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