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Vertical position

  (Redirected from Altitude, height, and depth)

Vertical position or vertical location is a position along a vertical direction above or below a given vertical datum. Vertical distance is the distance between two vertical positions. Many vertical coordinates exist for expressing vertical position: depth, height, altitude, elevation, etc. Each quantity may be expressed in various units: metres, feet, etc.

DefinitionsEdit

The International Organization for Standardization (ISO), more specifically ISO 19111, offers the following two definitions:[1]

  • depth: "distance of a point from a chosen reference surface measured downward along a line perpendicular to that surface."[1]
  • height: "distance of a point from a chosen reference surface measured upward along a line perpendicular to that surface";[1]

ISO 6709 (2008 version) makes the following additional definition:

  • altitude: "height where the chosen reference surface is mean sea level"[1]

The International Civil Aviation Organization (ICAO) offers similar definitions:[2]

  • altitude: "the vertical distance of a level, a point or an object considered as a point, measured from the mean sea level (MSL);"[2]
  • height: "the vertical distance of a level, a point or an object considered as a point, measured from an specific datum."[2]

ICAO further defines:

  • elevation': "the vertical distance of a point or a level, on or affixed to the surface of the earth, measured from mean sea level."[2]

I.e., elevation would be the altitude of the ground or a building.

Certain vertical coordinates are not based on length, for example, geopotential numbers.

See alsoEdit

ReferencesEdit

  1. ^ a b c d "ISO 6709:2008(en) preview". www.iso.org. ISO. Retrieved 8 June 2016.
  2. ^ a b c d United Nations - International Civil Aviation Organization. "Annex 4: Aeronautical Charts - Chapter 1 (Definitions, Applicability and Availbility)" (PDF). Archived from the original (PDF) on 2016-09-17. Note: Annex 4 is one of the (currently) 19 annexes to the Chicago Convention on International Civil Aviation (ICAO Doc. 7300).