Dynamic Ocean Topography (DOT) is the difference between the instantaneous sea surface height and the geoid (the equipotential surface of the Earth’s gravity field that most closely approximates the instantaneous sea level). DOT contains contributions from wind and other high frequency effects like tides, currents, and the loading of atmospheric pressure. DOT is also known as Absolut Dynamic Topography (ADT) or Ocean Surface Topography (OST). Mean Dynamic Topography (MDT) is the averaged DOT over a time period and it is considered semi-stationary. MDT is mainly caused by nearly constant oceanographic and meteorological effects, which generate ocean currents and ocean surface slopes. It is also called Sea Surface Topography (SSTop).