Geoid

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Geoid

A Geoid is the irregular shaped ball like structure of the earth that scientists use to more accurately calculate the depths of earthquakes, or any other deep object beneath the Earth’s surface. The earth is not a perfect sphere.
Geoid + Ellipsoid = Earth

Geoid is an imaginary sea level surface that have wavy surface over all of the world. It not for the oceanic areas but it also extends through the land masses.

Geoid is the shape that the ocean surface would take under the influence of the gravity and rotation of the earth alone, if other influences such as winds and tides were absent.
The figure earth in the first approximation can be considered a ball with an average radius of 6371 km in reality, the earth is not an ideal sphere. Due to diurnal rotation it is flattened from the poles. The height of the continents ate different, tidal deformation also deform the shape of the surfaces.

There is topographical variation but the surface of the earth is still very smooth when considered as a planetary scale.

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