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2. Orthometric height - Wikipedia

   en.wikipedia.org/wiki/Orthometric_height

   The orthometric height (symbol H) is the vertical distance along the plumb line from a point of interest to a reference surface known as the geoid, the vertical datum that approximates mean sea level. [1][2] Orthometric height is one of the scientific formalizations of a layman's "height above sea level", along with other types of heights in ...

3. Height above mean sea level - Wikipedia

   en.wikipedia.org/wiki/Height_above_mean_sea_level

   Height above mean sea level. Height above mean sea level is a measure of a location's vertical distance (height, elevation or altitude) in reference to a vertical datum based on a historic mean sea level. In geodesy, it is formalized as orthometric height. The zero level varies in different countries due to different reference points and ...

4. Level (optical instrument) - Wikipedia

   en.wikipedia.org/wiki/Level_(optical_instrument)

   A level is an optical instrument used to establish or verify points in the same horizontal plane in a process known as levelling. It is used in conjunction with a levelling staff to establish the relative height or levels (the vertical separation) of objects or marks. It is widely used in surveying and construction to measure height differences ...

5. North American Vertical Datum of 1988 - Wikipedia

   en.wikipedia.org/wiki/North_American_Vertical...

   Since NGVD 29 used a simple model of gravity based on latitude to calculate the geoid and did not take into account other variations, [citation needed] elevation difference between points in a local area in it and NAVD 88 will show negligible change from one datum to the other, even though the elevation of both does change between datums.

6. Topographic prominence - Wikipedia

   en.wikipedia.org/wiki/Topographic_prominence

   This can be calculated for a given peak in the following manner: for every path connecting the peak to higher terrain, find the lowest point on the path; the key col (or highest saddle, or linking col, or link) is defined as the highest of these points, along all connecting paths; the prominence is the difference between the elevation of the ...

7. Inclinometer - Wikipedia

   en.wikipedia.org/wiki/Inclinometer

   An inclinometer or clinometer is an instrument used for measuring angles of slope, elevation, or depression of an object with respect to gravity 's direction. It is also known as a tilt indicator, tilt sensor, tilt meter, slope alert, slope gauge, gradient meter, gradiometer, level gauge, level meter, declinometer, and pitch & roll indicator.