In basic, a datum is a base altitude used as a referral from which to reckon heights or depths. A tidal datum is a standard altitude specified by a particular phase of the tide. Tidal datums are used as references to measure neighborhood water degrees and must not be prolonged into areas having differing oceanographic characteristics without corroborating measurements. Below are interpretations of tidal information kept by the Center for Operational Oceanographic Products and Services. At most locations, there are semidiurnal trends-- the tide cycles with a low and high twice daily, with among the 2 high trends being greater than the other and among both low tides being lower than the other.
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