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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.
The National Geodetic Vertical Datum of 1929 is the official name since 1973 [1] of the vertical datum established for vertical control surveying in the United States of America by the General Adjustment of 1929. Originally known as Sea Level Datum of 1929, NGVD 29 was determined and published by the United States Coast and Geodetic Survey [2 ...
Tucson, Arizona. Tucson (/ ˈtuːsɒn /; O'odham: Cuk Ṣon; Spanish: Tucsón) [1] is a city in and the county seat of Pima County, Arizona, United States, [7] and is home to the University of Arizona. It is the second-largest city in Arizona behind Phoenix, with a population of 542,629 in the 2020 United States census, [8] while the population ...
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 ...
According to the United States Census Bureau, the city has a geographical area of 68.3 square miles (176.9 km 2), 61.4 square miles (159.0 km 2) of which is land, and the remaining 6.9 square miles (17.9 km 2) (10.16%) of which is water. The Anacostia River and the smaller Rock Creek flow into the Potomac River in Washington.
1984 (8th Session) Yosemite National Park (/ joʊˈsɛmɪti / yoh-SEM-ih-tee[5]) is a national park of the United States in California. [6][7] It is bordered on the southeast by Sierra National Forest and on the northwest by Stanislaus National Forest. The park is managed by the National Park Service and covers 759,620 acres (1,187 sq mi; 3,074 ...
Hawkeye Point is the highest natural point in Iowa at 1,670 feet (510 m). [1] It is approximately 4.5 miles (7.2 km) north of Sibley on the eastern side of SR 60 and approximately 3.5 miles (5.6 km) south of the Iowa - Minnesota state border. The high ground lies 100 feet (30 m) due south of an old silo. The land that includes the highpoint was ...