GPS Mapping Technologies - DeLorme
GPS Mapping Technologies - DeLorme
Eartha, The World’s Largest Revolving and Rotating Globe

Eartha illuminates DeLorme headquarters in Yarmouth, Maine, USA. Jeffrey Stevenson

Eartha’s Omni-Span tm Truss “skeleton.”

Eartha from the 3rd-story observation balcony.

Eartha is almost complete.

View Larger Map    Please note: The DeLorme Map Store has closed and will not be reopening.

The Guinness World Record Holder
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" by the editors of the Guinness Book of World Records in 1999, and still holds that record today. It measures 41.5 ft in diameter. Unveiled July 23, 1998 Eartha took two years to build and represents earth as it is seen from space. It rotates and revolves on a specially designed and built mechanized, cantilever arm.
The Official Measurements
The official measurements of Eartha were made for Guinness by several independent and licensed surveyors who found the Globe to measure 41 feet, one and one-half inches, slightly less than the rounded figure of 42 feet that was projected by DeLorme staff members. Still, 41' 1.5" was more than enough to surpass the former record-holder, the Globe of Peace in Apeccio, Pesaro, Italy (which is 33 feet in diameter and does not revolve or rotate).
An Engineering Accomplishment
Every aspect of Eartha was developed using computer technology. It was designed by founder David DeLorme. and constructed by DeLorme staff members. “The building of Eartha was a tremendous challenge for all of us," says DeLorme. "It will help us make even better maps and will help others envision how we on earth are all connected.”
  • 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.
Visit Eartha™ at DeLorme Headquarters, in Yarmouth, Maine
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.
"Eartha is the largest image of earth ever created," says DeLorme. "Eartha will instill a sense of wonder in people when they first see it and we hope they walk away from it with a better appreciation and knowledge of the world around them."
DeLorme is a longtime leader in innovative mapping and GPS products, and most recently the company has earned numerous prestigious awards for its groundbreaking integration of GPS navigation and satellite communications. The ability to develop all the critical components necessary to compete in these fast-changing technologies distinguishes DeLorme as a provider of unique solutions for both the commercial and government markets.