| The geoid is a hypothetical surface, on which the gravitational pull of the Earth is the same everywhere. |
| The geoid serves as the classical reference for all topographical features. |
| Precise knowledge of marine geoid is essential for study of mantle convection of oceanic litosphere. |
| The geoid model of mean sea level advanced through analysis of latest local and global gravity coverage. |
| The position of the equipotential surfaces of the geoid are also influenced by lunar and solar tidal effects. |
| The realization of a new vertical datum for Canada by geoid modelling, rather than by geodetic levelling. |
