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originally posted by: Sublimecraft
I first learned about this at the Maritime college when studying Celestial Navigation - because the Earth is flattened at the poles and bulges at the equator, geodetics engineering represents the shape of the earth with an oblate spheroid
By capturing the planet's gravity rather than its physical appearance, the geoid shows the shape that mean sea level would have if it could somehow be extended over the entire surface of the globe, said John Wahr, a geophysicist at the University of Colorado.
originally posted by: cmdrkeenkid
a reply to: Arbitrageur
The thread title also states that it's pertaining to the gravitational field and without water.
Edit to add: The body of the post is even very clear about this. Not a hoax, not even misleading.
As seen without water (or looking at the gravitational field of Earth) the Earth is not spherical at all but a lumpy mass like a potato.
Both the Earth itself and the Earth's gravitational geoid with or without water are much more closer in shape to a sphere than a potato. Are you seriously arguing it's more like a lumpy potato than a sphere and saying that is not misleading?
the Earth is not spherical at all but a lumpy mass like a potato.
The actual graphic is hugely exaggerated on purpose, making it easier to see the Earth’s lumpy gravity field.
You're entitled to your opinion.
This is a scientific model made to measure gravity. It does not have anything to do with taking oceans away. It shows what the earth would look this lumpy only if you removed all of the factors that help shape Earth’s surface, such as tides, weather, and wind, which will reveal that gravity varies across the globe.
originally posted by: nOraKat
Not sure how accurate those models are. Interesting either way.
I searched that source "Figure_of_the_Earth" for the word "geode" and that word doesn't appear in that link. Geode is a type of rock and the first thing it says at that link is "Not to be confused with geoid." but I think you confused them.
"The shape of the Geode, as it is called, is nearly a perfect sphere, but because the earth is spinning, it is about 21.5 kilometers flatter at the poles, and bulged-out at the equator by about the same amount."
"The possibility that the Earth's equator is an ellipse rather than a circle and therefore that the ellipsoid is triaxial has been a matter of scientific controversy for many years" en.wikipedia.org...