Sampling and Measuring Timber in the Private Woodland
Estimating Tree Defects
Many trees contain defects-branches, crook, decay, bird pecks, etc.-that may make them unusable, depending upon the type of product. It is important to consider defects when measuring timber.
If the entire tree is unsuitable because of an excessive amount of defect, do not measure it. For usable trees containing some defects, note the percent of defect by product. This percent is then deducted from the overall estimate of tree volume. Because tree diameter decreases with increasing height in the tree, a defect occurring near the top of the tree will require a smaller percentage deduction than a similarly occurring defect near the base. Percentage deductions for tree defects are best estimated by a professional forester and recorded either directly in an extra space in the table or along the margins.
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