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The height of any mountain or range - the Himalayas included - is usually measured by surveyors using a transit and measuring rod, or theodolites, which measure angles in the horizontal and vertical planes. An altimeter is another measuring tool which can be used, but it is not as accurate, and is unlikely to be used for the world's highest mountain range. Modern technology has now enabled the use of GPS satellite technology, or more precisely GNSS (Global Navigation Satellite Systems) technology.

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12y ago

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