For decades climbers have struggled with the physical and technological hurdles of measuring the Earth's highest mountain peaks. Now they're turning to survey-grade GNSS equipment to measure extraordinary heights. It may surprise you to learn that the majority of the world's mountains do not have official, recorded heights. Debate still swirls around the true elevation of even Mount Everest, which has long been accepted as the world's highest mountain. Nepal stands by the measurement of 8,848 meters (29,029 feet), the result of a 1954 survey; China refers to the mountain as 8,844 m (29,016 ft) from its 2005 expedition; and the U.S. Geological Survey (USGS) lists a height of 8,850 m (29,035 ft), a measurement taken from GPS recordings collected by a National Geographic Society-sponsored American team in 1999.
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