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  • Barry Graham September 20, 2017 at 8:47pm

    The GEOID is a smooth, irregular spheroid formed by the imaginary surface of mean sea level extended beneath the land surface.

    The shape of the GEOID is influenced by the forces of gravity which makes the surface rise beneath land masses and fall beneath oceans.

    • Land Surveyor
      Marika Kalouniviti > Barry Graham September 20, 2017 at 10:34pm

      Thanks, very easy to understand now but when you saying "mean sea level extented beneath the land surface", can you elaborate more on that please.

      • Barry Graham > Marika Kalouniviti September 20, 2017 at 11:36pm

        1201418590?profile=originalSea level is affected by gravity. The GEOID is an imaginary sea level at every point on earth.

        Under a land mass the imaginary surface is attracted upward by the mass of the land above.

        It is the level of the water surface in an imaginary, very deep well influenced only by the gravity of the land mass surrounding.

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