Abstract
1. I devised the following EMPIRICAL FORMULA for making easier and more accurate the measurement of the diameter of tree.
do=0.4D+0.6d
do......DIAMETER
D......MAXIMUM AXIS of the cross section.
d......GREATEST AXIS that is at right angles to the MAXIMUM AXIS of the cross section.
2. By this EMPIRICAL FORMULA, Measurement of the cross section-area was actually made of 66 “SUGI” (Criptomeria japonica D. DON) and 50 “AKAMATSU” (Pinus densiflora SIEB. et ZUCC) Produces from ONSEN-GUN, EHIME PREFECTURE, SHIKOKU, JAPAN.
3. The results thus obtained were compared respectively with those secured by using the following popular FORMULA, do=D+d/2
4. and I found that my method is superior to the above mentioned method in the probabilities of POSITIVE, NEGATIVE, MAXIMUM ERROR, as well as STANDARD DEVIATIONS.
5. I may confidently say, therefore, that my method is the more practical and accurate one for use in determining the diameter of trees.
