ICESat-2 is orbiting Earth, measuring elevation using lasers.
Scientists measure tree heights from space by comparing the elevation of the ground and the top of the forest.
By measuring tree height using the GLOBE Observer app,
you are providing information that can be compared to data from ICESat-2 and other NASA missions.
Find a tree to measure and open the Trees tool.
Aim your camera at the base of the tree and then at the top
Walk to the base of the tree, counting your steps.
The app will calculate the height for you.
When you're done, share your observations.
with researchers and other citizen scientists.
GLOBE Observer, observer.globe.gov