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Matti Kärkkäinen

Lisähavaintoja haapatukkien poikkipinta-alan mittaamisesta.

Kärkkäinen M. (1976). Lisähavaintoja haapatukkien poikkipinta-alan mittaamisesta. Silva Fennica vol. 10 no. 4 article id 4950. https://doi.org/10.14214/sf.a14796

English title: Auxiliary observations on the measurement of the cross-sectional area of aspen logs.

Abstract

In this study the area, 8 diameters, and 16 radii were measured of 174 discs representing aspen logs in a mill. The average difference between the largest and smallest diameter was 18 mm, or 7% of the longest diameter. The difference between the largest and smallest radius was 29 mm, or 22% of the longest radius. The diameter was on the average 2.4 mm longer than the two corresponding radii.

The exact area of each disc was measured using a planimeter. In comparison, the area based on the circle formula the diameter being the arithmetic mean of largest and smallest diameters overestimated the area by 1.7%. The results also indicated that the use of random direction in the measurement of diameter overestimated the cross-sectional area on the average by 1.8%.

The study is continuation of the earlier study where the bibliography is presented. As far as the results are comparable, they support each other.

The PDF includes a summary in English.

Original keywords
haapa; tukit; läpimitta; poikkipinta-ala; puutavaranmittaus

English keywords
aspen; logs; timber scaling; diameter; cross-sectional area

Published in 1976

Available at https://doi.org/10.14214/sf.a14796 | Download PDF

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