Analysis of piece by piece methods of round wood measurements and volume estimation

Abstract

Based on literature review piece by piece methods of round wood measurements employed in different countries are briefly discussed. The main working method of upper diameter (STB 1667-2012, GOST 2708–75) was researched (in comparison with the control data of formulas Smaliana and a truncated cone). An analysis of round wood volume tables from GOST 2708–75 in comparison with control data showed positive values of deviations that indicates larger values in standard volumes (GOST 2708–75) (up to 13% for medium-sized (24 cm) and large (over 24 cm) round wood). However, for logs with taper coefficient more than 1 cm/m) negative deviations are characterized, which, in turn, suggests an underestimation of wood volume in the standard tables in relation to the control data of formulas Smaliana and truncated cone (–18%). Formula Smaliana versus frustoconical formula underestimates the timber volume (however, not more than 1%). Obviously, both of these formulas can be used to determine the amount of measurement errors by the method of upper diameter. In our view, it is advisable to clarify the method of upper diameter based on the average value of taper coefficient in stacked batches of round wood (entering of amendments to the volumes from GOST 2708–75 on a log taper coefficient of real value).