CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Measuring the Earth's geoid. Artwork of an aircraft (far right) and satellites (upper right) being used to measure the surface topography of the Earth in order to produce an accurate representation of the Earth's geoid. The geoid is the surface of an ideal global ocean in the absence of tides and currents, shaped only by gravity.
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