Dynamic height
Dynamic height is a way of specifying the
normal gravity at 45 degree latitude and zero height (a constant equal to 9.806199203 m/s2).[1]
Dynamic height is constant if one remains at the same
Earth's gravity, surfaces having a constant difference in dynamic height may be closer or further apart in various places. Dynamic heights are usually chosen so that zero corresponds to the geoid
.
Dynamic height is the most appropriate height measure when working with the
level of water (as in hydrology or oceanography) over a large geographic area;[1] it is used by the Great Lakes Datum in the US and Canada.[2]
When
differential leveling is done, the path corresponds closely to following a value of dynamic height horizontally, but not to orthometric height for vertical changes measured on the leveling rod. Thus small corrections must be applied to field measurements to obtain either the dynamic height or the orthometric height usually used in engineering. US National Geodetic Survey data sheets[3]
give both dynamic and orthometric values.
See also
- Geopotential height, a similar quantity used in meteorology, based on a slightly different gravity value
References
- ^ hdl:1811/78667. Retrieved 2022-09-21.
- ^ "Zilkoski, National Geodetic Survey" (PDF).
- ^ "The National Geodetic Survey".
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