Accuracy of Double Bark Thickness Estimation Methods Used in Spruce—(Picea abies L. Karst) Timber Production in Czechia

The accurate estimation of bark thickness is important for foresters several reasons. It crucial timber volume and can help improve the quality forestry records, has a growing commercial importance as high-value bioresource. problem that models such Czech Cubic Tables (CCT) polynomial model are frequently unique. Furthermore, official method requires rounding down midspan over-bark diameter (DOB) to nearest centimetre estimate double (DBT) merchantable volume. Therefore, we verified significance effects DOB on DBT using dataset 438 recently harvested Norway spruce (Picea Abies L. Karst.) logs from Central Bohemian region. correlation analysis showed measured data without diameters, variability was able explain only 8% variability. As rounded-down data, coefficient determination slightly higher, reaching 9%. paired-samples T-tests significant difference between calculated directly diameters (p < 0.05). linear underestimated (2.24 1.75 mm average, respectively) data. In contrast, DOB, overestimated (2.70 or 3.18 respectively).