Today I learned how to measure trees at DBH (data breast high) which is about 3.1 meters from the forest floor. This measurement is marked with tags and flags and plotted into a ten by ten hectare. The tape measure we are using (see above) is special; it automatically measures diameter, not circumference. This is great as I do not have to use any math formulas to arrive at the correct measurements! A dendromenter is attached. This metal spring slowly opens as the tree grows and scientist measure the tree growth and compare each tree to all the other trees in the forest. They are trying to find ways to create/maintain healthy forests; not only in America, but all over the world. China, India, Brazil, and England are also engaged in this same experiment. The forest I am working in has over 52 species of trees spread out over 2500 acres.