NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Mars global topography. Three-dimensional map of Mars showing the topography of the entire planet as plotted by the Mars Global Surveyor spacecraft. Colour-coding shows elevation of the surface relative to the average surface height at the equator. Yellow areas are average elevation, while red is higher, and green to blue lower. South (at left) and north (right) poles are at upper frame; the rectangular image shows the majority of the planet. This data was recorded by the Mars Orbiter Laser Altimeter (MOLA) on board the Mars Global Surveyor spacecraft. Up to 27 million measurements accurate to within 13 metres were made in 1998 and 1999 by timing laser pulses sent to Mars' surface.
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