Image: ICESat-2 reveals profile of ice sheets
(PHYSorg.com Space & Earth)

Less than three months into its mission, NASA`s Ice, Cloud and land Elevation Satellite-2, or ICESat-2, is already exceeding scientists` expectations. The satellite is measuring the height of sea ice to within an inch, tracing the terrain of previously unmapped Antarctic valleys, surveying remote ice sheets, and peering through forest canopies and shallow coastal waters.