Measuring tree heights

Today when we went to the woods, we measured the height of some of the trees in the area. We did this by stepping away from the chosen tree then bending down to see if we could see the top of the tree, if we could we took a metre stick and worked out how far away from the tree we were, that was the rough estimate of the height of the tree. If you couldn’t see the top then you kept repeating this until you could see it.