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How do they measure distance from sea level??????

April 26, 2017distance earth Geology level Mathematics measure sciences sea

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How do they measure distance from sea level??????

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It’s not the distance from sea level, it’s the elevation of the land above sea level.

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They install a mirror on a mountain top, then send a laser beam at it from the shore, then determine the distance to the mirror by means of interference measurements, then measure the angle of the beam to horizon, then calculate the altitude by means of trigonometry.

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JimGeek has the right slant to this question. The oldest way to measure elevation was done by barometric pressure. Since atmosphere pressure was determined and established as a constant, 14.7 psi at sea level, the decrease in pressure as elevation increased is a basic mathematical function.

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With satellites and tide gauges. Satellites can record the level of oceans around the globe, while tide gauges are used to measure the height of water with respect to a fixed, nearby point on land.

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It is done 2 ways by aircraft, by barostatic altimeters, they have a bellows that reacts to atmospheric pressure and transduce this to altitude and they use radar altimeters, which use radar to reflect off whatever is below, water, or mountains. Radar altimeters warn aircraft of upcoming danger of mountains, barostatic types do not. Modern day aircraft also have laser devices to measure this.