"MOLA is the Mars Orbiter Laser Altimeter, an instrument currently in orbit around Mars on the Mars Global Surveyor (MGS) spacecraft. The instrument transmits infrared laser pulses towards Mars at a rate of 10 Hz and measures the time of flight to determine the range of the MGS spacecraft to the Martian surface. Range measurements have used to construct a precise topographic map of Mars that has many applications to studies in geophysics, geology and atmospheric circulation."

You can read more here.

You can read about how I processed the MOLA data here.

Below are links to pages showing the different ways I processed the data.