orthometric height sentence in Hindi
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- The deviation N between the ellipsoidal height h and the orthometric height H can be calculated by
- The reference surface for orthometric heights is the geoid, an equipotential surface approximating mean sea level.
- Then, the traditional connection between orthometric heights " H " and ellipsoidal heights " h ",
- Thus small corrections must be applied to field measurements to obtain either the dynamic height or the orthometric height usually used in engineering.
- Orthometric heights are usually used in the US for engineering work, although dynamic height may be chosen for large-scale hydrological purposes.
- Elevation may be specified as normal height ( above a reference ellipsoid ), orthometric height, or dynamic height which have slightly different definitions.
- So not showing the orthometric height of the sea ( and water bulges at the equator on the geoid sphere and lower at the poles ).
- Since gravity is not constant over large areas the orthometric height of a level surface is not constant, and NGS orthometric heights are corrected for that effect.
- Since gravity is not constant over large areas the orthometric height of a level surface is not constant, and NGS orthometric heights are corrected for that effect.
- The definition of NAVD 88 uses the Helmert orthometric height, which calculates the location of the geoid ( which approximates sea level ) from modeled local gravity.
- When optical leveling is done, the path corresponds closely to following a value of dynamic height horizontally, but to orthometric height for vertical changes measured on the leveling rod.
- In Albania ( normal-orthometric height ) they also refer to heights as'metres above the Adriatic', but use a specific tide gauge in the port of Durr�s.
- The NHN was introduced because for heights above the actual normal orthometric heights ( new methods of calculation ) and the normal heights of East Germany ( with respect to the Amsterdam Datum ).
- GPS measurements give earth-centered coordinates, usually displayed as height above the reference ellipsoid, which cannot be related accurately to orthometric height above the geoid without accurate gravity data for that location.
- As gravitational potential cannot be neglected for applications with high accuracy requirements, the Swiss national height network 1995 ( LHN95 ) created a new orthometric height vertical reference point, fixed to the geoid.
- Orthometric height is for practical purposes " height above sea level " but the current NAVD88 datum is tied to a defined elevation at one point rather than to any location's exact mean sea level.
- 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 Montana will be 1001 meters high in Texas.
- Normal gravity values are easy to compute and " hypothesis-free ", i . e ., one does not have to know, as one would for computing orthometric heights, the density of the Earth's crust around the plumbline.
- Practical applications must use a model rather than measurements to calculate the change in gravitational potential versus depth in the earth, since the geoid is below most of the land surface ( e . g ., the Helmert Orthometric heights of NAVD88 ).
- "' VERTCON "'is a computer program that computes the modeled difference in orthometric height between the North American Vertical Datum of 1988 ( NAVD 88 ) and the National Geodetic Vertical Datum of 1929 ( NGVD 29 ) for a location in the contiguous United States.
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