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...

of the North American Datum of 1988. It superseded the National Geodetic Vertical Datum of 1929 (NGVD 29), previously known as the Sea Level Datum of...

Vertical Datum of 1929 and the North American Vertical Datum of 1988. In common usage, elevations are often cited in height above sea level, although...

mathematical model of the Earth's sea level as an equipotential gravitational surface (see Geodetic datum § Vertical datum). The term elevation is mainly...

standard origin, such as mean sea level (MSL). Since the rise of the global positioning system (GPS), the ellipsoid and datum WGS 84 it uses has supplanted...

Between 1901 and 2018, average global sea level rose by 15–25 cm (6–10 in), an average of 1–2 mm (0.039–0.079 in) per year. This rate accelerated to 4...

measurement resulted from the Sea Level Datum of 1929. A matter of some contention arose after the Great Depression over the heights of Elbert and its neighbor...

S. state of Montana. Maps indicate the peak is listed only by the elevation of 9,996 ft (3,047 m) according to the Sea Level Datum of 1929, however the...

physical survey marks that deteriorate over time. Altitude Geodesy Sea Level Datum of 1929 Topographic elevation Topography Reference ellipsoid Geoid Attribution:...

American Datum (NAD) is the horizontal datum now used to define the geodetic network in North America. A datum is a formal description of the shape of the...