Scientists using remote sensing photos can estimate the height of objects in the photos by noting the time of day and studying the length and angles of shadows.
Students can do the same.
The clinometer or biltmore stick is available in many education stores. Students can also use two ancient but relatively accurate ways of measuring height which are described below. They would walk away from something for which they wanted to know the height, say a tree, until they could see the top of the tree while they bent over and held their ankles and looked between their legs. Then, they would walk back and count each step as they returned to the tree. The number of steps they counted was height of the tree.