An altimeter measures altitude. Radar can be used for altimetry while it can also be used to study the interior of glaciers, measure thickness of ice, etc.Can somewhat explain what the difference between altimetry and radar is? In section 3.n. the rules mention that we must know methods of studying glaciers: Altimetry, radar . . . but as far as I can tell radar is a type of altimetry. Does altimetry refer specifically to laser altimetry, while radar refers to radar altimetry? Did I misunderstand something?