DBH(Diameter Breast Height) is the diameter at 4.5ft or 1.3 metres above the ground.
First , we use the measuring tape and record the height of 1.3m of the tree.
Then , keep the level of the tape
Use the measurement tape to round the tree for one circle
The measurement that I just took is actually the tree’s circumference
Then , divide the cirumference by “pi” , we can get the DBH (Diameter Breast Height ) of the corresponding tree.