The Mars Global Surveyor spacecraft measures The Tharsis Ridge.
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NASA/JPL
Altimetry
Altimetry is a term which describes a method of measuring the altitudes of things with remote spacecraft. It is usually performed with a laser. Laser altimeters bounce beams of light from the surface and back to the spacecraft to measure the heights of mountains and depths of valleys on remote planets. This is even done for our own planet. The figure shown here shows laser altimeter results from the Mars Global Surveyor spacecraft. The red line shows the relative heights of the ground underneath the spacecraft.
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Mars Global Surveyor carries an instrument which measures the heights of things. This instrument is called an altimeter, or "altitude-meter". The picture to the left shows Mars Global Surveyor's measurement
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Mars Global Surveyor carries an instrument which measures the heights of things. This instrument is called an altimeter, or "altitude-meter". The picture to the left shows the results returned from Mars
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