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How Do They Establish “Elevation From Sea Level”The Pacific And Atlantic Oceans Are Not The Same Height In Central America?

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How Do They Establish “Elevation From Sea Level”The Pacific And Atlantic Oceans Are Not The Same Height In Central America?

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This one really got us thinking. And around here thinking quickly leads to weeping, followed shortly thereafter by disconsolate Twinkie-eating. Luckily, in this case, the Web bailed us out, providing several resources for information on the elusive concept of “sea level.” First, we did a search on the phrase “calculating elevation,” which seemed like it might narrow things down more than “sea level.” One of the first results landed us smack dab in the middle of the National Center for Geographic Information and Analysis’s Core Curriculum for Technical Programs, where John Schaeffer describes using particular “datum planes” when determining elevation via the Global Positioning System (GPS). It seems that a great deal depends on whether you’re using a geoid model or an ellipsoid model. Confused? Don’t worry. So were we. Here’s the short course: Sometimes elevation above sea level is determined by the ge

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