My buddy and I were driving somewhere today and we passed a sign for a town that listed its elevation above sea level. He wondered aloud how they
measure that. He got me wondering too. How do they measure that?
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One way to do that, is to anchor a buoy off shore somewhere, which has a device on board which counts the number of feet of anchor cable which is
currently deployed beneath the buoy, and transmits that data to shore, where it is then processed and added to the equation which results in the mean
average sea level being identified.
As technology improves, measurement of such things is only becoming more precise, with better gauging equipment and faster and more frequent
transmission of information.
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