Glossary

D

Datum

A datum is a point, line or surface used as a reference as in surveying, mapping, geology or numerical modeling.

M

MHHW

Mean Higher High Water. The average of the higher high water height of each tidal day observed over the National Tidal Datum Epoch.

MHW

Mean High Water. The average of all the high water heights observed over the National Tidal Datum Epoch.

MSL

Mean Sea Level. The arithmetic mean of hourly heights observed over the National Tidal Datum Epoch.

MLW

Mean Low Water. The average of all the low water heights observed over the National Tidal Datum Epoch.

MLLW

Mean Lower Low Water. The average of the lower low water height of each tidal day observed over the National Tidal Datum Epoch

T

Tidal Datum

A tidal datum is a standard elevation defined by a certain phase of the tide. Tidal datums are used as references to measure local water levels.

V

Validation

In computer modeling and simulation, validation is the process of determining the degree or accuracy to which a model or simulation is an accurate representation of a real world process from the perspective of the intended uses of the model or simulation.

Verification

In computer modeling and simulation, verification is the process of determining the accuracy of which the governing equations of a specific model or simulation are being solved.