To calculate precise ice surface elevations and changes in elevation, the altimeter range measurements need to be referenced to a common datum and corrected for tracker misalignment of the waveform due to inter-pulse variations, atmospheric delays, solid earth and ocean tides, and slope-induced errors. The corrected altimeter range measurement is then subtracted from a precision orbit
to calculate a corrected surface height. The follwing table shows the corrections, in order of their magnitude, used in the data processing flow
| Correction Name
|| Magnitude (m)
|| Manner applied to surface height
| Slope Correction
|| Corrects for slope-induced errors.
|| 0 to 150
|| Corrects for tracker lag.
|| -15 to 15
| Tropospheric Refraction
|| Corrects for signal delay due to pressure variations
and water vapor in the troposphere.
|| 1.5 to 2.5
| Ionospheric Refraction
|| Corrects for signal delay due to charged particles in the ionosphere.
|| .02 to .10
| Tides (ocean and solid earth)
|| Removes earth and ocean dynamics.
|| -3 to 3