https://www.nasa.gov/centers-and-facilities/goddard/nasa-space-laser-missions-map-16-years-of-ice-sheet-loss/
NASA Space Laser Missions Map 16 Years of Ice Sheet Loss - NASA
Using the most advanced Earth-observing laser instrument NASA has ever flown in space, scientists have made precise, detailed measurements of how the
nasa spacemissions map16 yearsice sheetlaser