WEBVTT FILE

1
00:00:00.000 --> 00:00:01.200


2
00:00:01.200 --> 00:00:06.566
ICESat-2 is orbiting Earth, measuring elevation using lasers.

3
00:00:06.566 --> 00:00:06.600


4
00:00:06.600 --> 00:00:08.233


5
00:00:08.233 --> 00:00:16.500
Scientists measure tree heights from space by comparing the elevation of the ground and the top of the forest.

6
00:00:16.500 --> 00:00:21.800
By measuring tree height using the GLOBE Observer app,

7
00:00:21.800 --> 00:00:28.333
you are providing information that can be compared to data from ICESat-2 and other NASA missions.

8
00:00:28.333 --> 00:00:32.900
Find a tree to measure and open the Trees tool.

9
00:00:32.900 --> 00:00:37.566
Aim your camera at the base of the tree and then at the top

10
00:00:37.566 --> 00:00:42.666
Walk to the base of the tree, counting your steps.

11
00:00:42.666 --> 00:00:48.466
The app will calculate the height for you.

12
00:00:48.466 --> 00:00:52.633
When you're done, share your observations.

13
00:00:52.633 --> 00:00:56.633
with researchers and other citizen scientists.

14
00:00:56.633 --> 00:01:00.466


15
00:01:00.466 --> 00:01:06.466
GLOBE Observer, observer.globe.gov