2 July 2015: Added an introductory note:
This lesson uses Jason-2 to show how altimeters work and the general applications possible with altimeters. Since Jason-2 was launched other altimeters have become available (e.g. Altika, Cryosat, Jason 3) and more will become available in the near future (e.g. Sentinel 3) - they all follow the principles and applications described in this lesson.