The measurements have allowed scientists to create a computer model called a 'geoid' that reveals what Earth would look like if its shape were altered to make gravity equal at every point on the surface.
Researchers unveiled the latest data from the European Space Agency's Gravity and Ocean Circulation Explorer, or Goce, at a workshop in Munich on Thursday.
The spacecraft circles the Earth at an altitude of 150 miles (250km) and uses an ion rocket to prevent it losing height as it flies through wisps of atmosphere.
Earth's gravity is subtly influenced by all manner of changes in the structure and topography of the Earth. The planet is not a perfect sphere, instead bulging around the equator, making gravity weaker there than at the poles. Gas fields, mineral deposits, aquifers and rock formations also affect the pull of gravity.
"At its early conception, GOCE was more like science fiction. GOCE has now clearly demonstrated that it is a state-of-the-art mission," said Volker Liebig, director of Esa's Earth Observation Programs.
Posted By Zach Royer | 4:44 PM PST | March 31st, 2011