Brian Campbell | Through the NASA GLOBE Program, students, educators, and citizen scientists can take ground-based measurements and observations of tree heights and compare the ground-based GLOBE tree height data with tree canopy height data from the NASA ICESat-2 Mission. Using the online Open Altimetry Tool allows you can see when ICESat-2 flew over or near the location of a tree or canopied area that has been observed and measured by a student or citizen scientist on the ground. NASA Science Theater at AGU 2020.