What term refers to the surface used as a reference for geodetic surveys that closely resembles the geoid?

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Geodetic surveys rely on a smooth reference surface that approximates the Earth's shape so coordinates can be measured and calculated consistently. The geoid represents the true, irregular figure of Earth, so the reference surface is chosen to resemble this shape without being the geoid itself. The oblate spheroid—a surface formed by rotating an ellipse about its minor axis—accounts for the slightly flattened poles due to Earth's rotation, making it a close and practical match to the geoid for calculations. This specific, revolved form is why it’s used as the reference surface in many surveying systems, more closely resembling the geoid than a perfect sphere or a generic globe. An ellipsoid is a broader mathematical category, while a sphere is too simplified and a globe is just a visual representation; the spheroid captures the essential flattening while staying mathematically manageable.