How to measure breast diameter?

Measure DBH with a tape measure as follows:

The size of trees is generally expressed by the diameter at breast height (that is, the diameter of the trunk). There is a special DBH ruler to measure DBH. If not, you can also use an ordinary steel tape measure. In China, DBH is from the ground to 1.30 meters. The result of tape measure divided by 3. 14 is DBH (generally measured at 1.2 m, and also needed at 1.3 m), and DBH below 10cm can also be measured with vernier caliper.

DBH:

DBH: Also called trunk diameter, it refers to the DBH of the tree trunk from the ground surface. When the cross section is abnormal, measure the average of the maximum value and the minimum value. Different trees have different DBH, and different countries have different regulations on DBH. In China and most countries, the breast height is set at1.3m above the ground.