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Physical geodesy - Wikipedia, the free encyclopedia (1242 words) |
 | The separation between these two surfaces is called the undulation of the geoid, symbol N, and is closely related to the disturbing potential. |
| The geoid, or mathematical mean sea surface, is defined not only on the seas, but also under land; it is the equilibrium water surface that would result, would sea water be allowed to move freely (e.g., through tunnels) under the land. |
| As mean sea level is physically realized by tide gauge bench marks on the coasts of different countries and continents, a number of slightly incompatible "near-geoids" will result, with differences of several decimetres to over one metre between them, due to the dynamic sea surface topography. |
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