National Geodeticvertical Datum

Science / Tides and Currents / National Geodeticvertical Datum: A fixed reference adopted as a standard geodetic datum for elevations determined by leveling. The datum was derived for surveys from a general adjustment of the first-order leveling nets of both the United States and Canada. In the adjustment, mean sea level was held fixed as observed at 21 tide stations in the United States and 5 in Canada. The year indicates the time of the general adjustment. A synonym for Sea-level Datum of 1929. The geodetic datum is fixed and does not take into account the changing stands of sea level. Because there are many variables affecting sea level, and because the geodetic datum represents a best fit over a broad area, the relationship between the geodetic datum and local mean sea level is not consistent from one location to another in either time or space. For this reason, the National Geodetic Vertical Datum should not be confused with mean sea level. See North American Vertical Datum of 1988 (NAVD 1988).

Other Words for National

National Adjective Synonyms: nationwide, country-wide, state, governmental, civil, public, popular, federal
National Noun Synonyms: nationalistic, nationalist, patriotic, jingoistic, chauvinistic
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National Geodeticvertical Datum

Science / Tides and Currents / National Geodeticvertical Datum: A fixed reference adopted as a standard geodetic datum for elevations determined by leveling. The datum was derived for surveys from a general adjustment of the first-order leveling nets of both the U MORE

National Grandparents Day

Life Style / Holiday / National Grandparents Day: The first Sunday after Labor Day has been declared National Grandparents Day in the United States. The proclamation for the holiday was signed by President Jimmy Carter in 1978. The September date was MORE

National Grasslands

Business / Agriculture / National Grasslands: A type of unit designated by USDA and under Title II of the Bankhead-Jones Farm Tenant Act, permanently held by USDA as part of the National Forest System. MORE

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