![]() The name comes from the word “ellipse,” which is used to describe a similar alteration to a circle. So what is an ellipsoid?Īn ellipsoid is, in essence, an imperfect sphere. So what shape is the Earth, and how does its classification impact surveying jobs? To answer that, you’ll need to understand the difference between a geoid and an ellipsoid, two ways of modeling designed to map out the imperfections of our planet. Earth - with its irregular shape, high plateaus and deep cracks in the ocean floor - is anything but. To be classified as a perfect sphere, an object must be completely round and symmetrical, able to be diced down the middle from any direction and create two equal halves. Is the Earth really round? While the answer should seem obvious, it’s really not as simple as you may think. ![]()
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