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B Height measurement on other planets

  1. Dec 19, 2016 #1
    If you measure the height of a mountain, you compare it's height with the sea level. But on let's say mars, how do you measure height when there is no sea to compare with?

    For example: Olympus Mons is considered to be the tallest mountain or vulcano in the solar system, but what is the level on which you compare it with? There is no sea level or anything like that.

    Thanks
     
  2. jcsd
  3. Dec 19, 2016 #2

    Drakkith

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    Staff: Mentor

    The choice of the zero mark for elevation is rather arbitrary. For Mars, it is currently determined by an equipotential surface.

    From wikipedia: https://en.wikipedia.org/wiki/Geography_of_Mars#Zero_elevation

     
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