Angle gauge
An angle gauge is a tool used by
Use
When using an angle gauge the user must count trees that are larger than the width of the angle gauge, as viewed from the center of the plot. The angle gauge is held a set distance from the eye of the surveyor. Most angle gauges have a string or chain that lets the user know the set distance. Each angle gauge is set at a certain
Borderline trees
Some trees are on the borderline of the plot and must be checked to be sure they are to be included. The limiting distance must be calculated to see if the trees are in or out. The equation to calculate the limiting distance in feet is diameter at breast height, DBH, in inches times plot radius factor, PRF, in feet/area Dlim = DBH×PRF.
For example, using a BAF 10 angle gauge a forester needs to know the limiting distance for a 20-inch (510 mm) tree. The PRF using a 10 BAF angle gauge is 2.75 feet (0.84 m) for every inch of tree diameter. Therefore, 20 inches × 2.75 ft/inch = 55 feet (17 m). This means that a 20-inch (510 mm) tree must be over 55 feet (17 m) away from the center of the plot using a BAF 10 angle gauge to be out of the plot.[1]
References
- ^ Introduction to Forest Measurements Archived March 13, 2008, at the Wayback Machine
Further reading
- Avery and Burkhart. Forest Measurements. Fifth Edition, McGraw Hill, New York, New York: 2002.