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Q: The distance from the geoid surface to the ground surface is known as:
  • A. Height of instrument
  • B. Ellipsoidal height
  • C. Geodetic height
  • D. Orthometric height
Correct Answer: Option D - Orthometric height– The orthometric height is the vertical distance H along the plumb line from a point of interest to reference surface known as the geoid, the vertical datum that approximates mean sea level. Orthometric height is one of the scientific formalizations of a laypersons, height above sea level, along with other types of heights in geodesy.
D. Orthometric height– The orthometric height is the vertical distance H along the plumb line from a point of interest to reference surface known as the geoid, the vertical datum that approximates mean sea level. Orthometric height is one of the scientific formalizations of a laypersons, height above sea level, along with other types of heights in geodesy.

Explanations:

Orthometric height– The orthometric height is the vertical distance H along the plumb line from a point of interest to reference surface known as the geoid, the vertical datum that approximates mean sea level. Orthometric height is one of the scientific formalizations of a laypersons, height above sea level, along with other types of heights in geodesy.