Orthometric height
The orthometric height is the
In the US, the current
Alternatives to orthometric height include dynamic height and normal height, and various countries may choose to operate with those definitions instead of orthometric. They may also adopt slightly different but similar definitions for their reference surface.
Since gravity is not constant over large areas the orthometric height of a level surface (equipotential) other than the reference surface is not constant, and orthometric heights need to be corrected for that effect. For example, gravity is 0.1% stronger in the northern United States than in the southern, so a level surface that has an orthometric height of 1000 meters in one place will be 1001 meters high in other places. In fact, dynamic height is the most appropriate height measure when working with the level of water over a large geographic area.[4]
Orthometric heights may be obtained from
See also
References
- ^ Paul R. Wolf and Charles D. Ghilani, Elementary Surveying, 11th ed. p. 581
- ^ Hofmann-Wellenhof and Moritz, Physical Geodesy p.47, p. 161
- ^ US Department of Commerce, NOAA; US Department of Commerce, NOAA. "National Geodetic Survey - Home". www.ngs.noaa.gov. Retrieved 2020-09-07.
- hdl:1811/78667. Retrieved 2022-09-21.
- S2CID 54939075.
- ^ Hofmann-Wellenhof and Moritz, Physical Geodesy p. 163
- ^ "GRAV-D Project Homepage- National Geodetic Survey".
 | This geodesy-related article is a stub. You can help Wikipedia by expanding it. |