ICESat-2 will give scientists a clear picture of exactly how polar ice is changing.
NASA’s new Ice, Cloud and land Elevation Satellite-2 (ICESat-2) takes a different approach, by sending a powerful laser into space.
Onboard the satellite is the Advanced Topographic Laser Altimeter System (ATLAS), which is designed to measure the exact height of Arctic ice.
http://www.popularmechanics.co.za/science/nasas-new-spacecraft-will-fire-high-powered-lasers-ice/
NASA Will Launch a Laser Into Space Next Month to Track Earth’s Melting Ice
https://www.livescience.com/63424-nasa-icesat2-earth-ice-satellite-september-launch.html