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Height above mean sea level. Height above mean sea level is a measure of a location's vertical distance (height, elevation or altitude) in reference to a vertical datum based on a historic mean sea level. In geodesy, it is formalized as orthometric height. The zero level varies in different countries due to different reference points and ...
Kingman Reef high point – less than 7 feet (2 m) [ 92 ] Midway Atoll, Sand Island high point – 50 feet (15 m) [ 92 ] – The highest point of the U.S. minor outlying islands in the Pacific Ocean. Navassa Island high point – 280 feet (85 m) [ 91 ] – The highest point of all the U.S. minor outlying islands.
Fort Reno Park has the highest point in the District of Columbia. [11] 345 feet (105 m) Lakewood. Florida. [12] Unincorporated settlement by Britton Hill, the highest natural point in Florida. Britton Hill is the lowest high point in any state. The highest incorporated town is nearby Paxton, at 318 feet (97 m).
Elevation. The elevation of a geographic location is its height above or below a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth 's sea level as an equipotential gravitational surface (see Geodetic datum § Vertical datum). The term elevation is mainly used when referring to points on the Earth's ...
The term "United States," when used in the geographical sense, refers to the contiguous United States (sometimes referred to as the Lower 48, including the District of Columbia not as a state), Alaska, Hawaii, the five insular territories of Puerto Rico, Northern Mariana Islands, U.S. Virgin Islands, Guam, American Samoa, and minor outlying possessions. [1]
In modern mapping, a topographic map or topographic sheet is a type of map characterized by large- scale detail and quantitative representation of relief features, usually using contour lines (connecting points of equal elevation), but historically using a variety of methods. Traditional definitions require a topographic map to show both ...
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