When comparing water level observations (from tide stations) with other observations, observations with models or models to other models, you must always use consistent vertical datums in order to avoid misinterpreting surge elevations.
Knowing your elevation and using a consistent datum is very important. Along the coast, areas higher than MHHW are typically dry most of the time. The tidal datum MHHW (Mean Higher High Water) is the best possible approximation of the threshold at which inundation can begin to occur. Inundation provides the most clearly and commonly understood method for communicating storm surge driven coastal flooding. The datum is an imaginary vertical plane from which all horizontal measurements are taken for balance purposes, with the aircraft in level flight attitude. Inundation is the total water level that occurs on normally dry ground as a result of storm tide, and is expressed in terms of height of water, in feet, above ground level (AGL). back of the aircraft, a few extra pounds well aft of the aircrafts datum. National Geodetic Vertical Datum of 1929 (NGVD29) Increased obesity in Americans is a growing concern for the aviation industry. North American Vertical Datum of 1988 (NAVD88) Geodetic datums: based on a simplified surface that represents the Earth’s shape and size. ADDS was developed as a joint effort of NCAR Research Applications Program ( RAP ), Global Systems Division ( GSD) of NOAA's Earth System Research Laboratory.
Timely and secure transfer and analysis of mission and operations data are critical to military readiness and effectiveness, said Lance Spencer, client executive vice president, Defense, AT&T Public Sector and FirstNet. The Aviation Digital Data Service (ADDS) makes available to the aviation community text, digital and graphical forecasts, analyses, and observations of aviation-related weather variables.
Tidal datums: reference water levels defined by a phase of the tide. Operators assess these thousands of data points to ensure the aircraft is safe, reliable and ready to fly. It is simply a reference level, a zero surface to which storm surge heights are referred.
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