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How to measure diameter at breast height (dbh )
Measure 4.5 ft (1.3 m) above the ground.
Use yourself as a human measuring stick by locating this point on your body before entering the field. If the tree is on a slope, measure from the highest point of the ground.
Wrap your diameter tape around the tree's trunk at the determined height. Most tapes have a hook attached that you can use to anchor the end of the tape if the trunk is too big to wrap your arms around.