|LMSL is obtained at the tide
|MDT is the new term for Sea
Surface Topography (SST)
|MDT is the offset between
the LMSL (the likely vertical datum point) and the global geoid (MSL) datum.
|MDT can vary significantly
over small regions, particularly from one side of an island to another.
|MDT derives from
temperature/density (salinity) differences and cause the ocean currents.
|The Gulf Stream is an
example of MDT.
|Prevailing winds can also
fetch up a MDT that can be significant.
|This discussion will center
first on the geodetic concepts and models, then will be followed by the
relationship of those models to the oceanographic features.