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Our Glaciers: Then and Now activity kit helps you see the changes taking place in glaciers around the world. See all our activity kits and classroom activities.
This graph illustrates one way in which the altimeter instrument studies the planet.
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Image from: NASA/JPL

Mars Global Surveyor Measures Volcano Altitudes

Mars Global Surveyor carries an instrument which measures the altitudes of things. The instrument is called an altimeter, or "altitude-meter".

The graph to the left shows Mars Global Surveyor's measurement of the size of some of the Martian volcanoes. The altitudes measured by the altimeter are shown in both kilometers and in miles. Shown for comparison is the altitude of the biggest Martian volcano, Olympus Mons. Some of the other volcanoes seem higher than Olympus Mons because they sit on ground level which is higher than the ground level on which Olympus Mons stands.


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Mars Global Surveyor carries an instrument which measures the altitudes of things. The instrument is called an altimeter, or "altitude-meter". The graph to the left shows Mars Global Surveyor's measurement...more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF