However, most tree stems taper as you move higher in the tree. If the bole or stem of a tree were shaped like a true cylinder, the calculation of volume in the stem would be simple. DBH can also be measured using calipers or Biltmore sticks. The following video shows techniques for using a D-tape. The converted diameter readings are printed on the D-tape for quick and efficient field work. DBH is commonly measured with a diameter tape (D-tape), which is designed to allow users to measure circumference at 4.5 feet (1.3 meters) and convert to a measurement of diameter (diameter = circumference/pi ). DBH is defined as average outside bark diameter when measured on the uphill side of a tree at 4.5 feet (Avery and Burkhart 2002). Tree Measurements Diameter MeasurementsĪmongst forest measurements, the most common and easily obtained tree measurement is diameter at breast height (DBH). This paper outlines the process of timber cruising from initial tree-level measurements to the final total stand-level estimates and various methods for conducting the cruise. Commonly referred to as timber cruising, this exercise begins with planning and determining the sample allocation and type of plots, followed by basic measurement and analysis of a single tree for an estimate of stem volume.
The process of determining timber inventory typically involves sampling a portion of the forest and expanding these samples to calculate stand-level estimates. Foresters approximate the amount of lumber or fiber within a stand to inform their clients on how to manage their assets and maximize revenue. John Dooner and Michael Andreu 2 IntroductionĪn integral part of any forest management program and long-term economic plan is an estimation of the current volume and value of a timber stand.
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