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ICESat-2 is orbiting Earth, measuring elevation using lasers.

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Scientists measure tree heights from space by comparing the elevation of the ground and the top of the forest.

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By measuring tree height using the GLOBE Observer app,

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you are providing information that can be compared to data from ICESat-2 and other NASA missions.

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Find a tree to measure and open the Trees tool.

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Aim your camera at the base of the tree and then at the top

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Walk to the base of the tree, counting your steps.

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The app will calculate the height for you.

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When you're done, share your observations.

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with researchers and other citizen scientists. 

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GLOBE Observer, observer.globe.gov