Many people upload pictures of nature, trees in particular, on social media. NASA is now asking users to do that more for the sake of science to help measure trees’ height. NASA has ICESat-2 satellite ...

Find a tall stick. That and one good eye are all the tools you’ll need. With the stick in hand, walk exactly 11 paces from the base of the tree and mark the spot by driving the stick into the ground.

NASA is calling on users of its GLOBE Observer app to use their smartphone camera as a method to help verify satellite data measuring the height of trees. The update to its app, adding the feature, ...