This graph illustrates one way in which the altimeter instrument studies the planet.
Click on image for full size
Image from: NASA/JPL
Mars Global Surveyor Measures Volcano Altitudes
Mars Global Surveyor carries an instrument which measures the heights of things.
The picture to the left shows the results returned from Mars Global Surveyor's measurement of the size of some of the Martian volcanoes. The altitudes measured by the spacecraft are shown in 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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