一致高和と切断径の二乗和の間接推定

概要

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This paper compares two sampling techniques for estimating stand volume through the indirect measurement of the sum of critical heights ana the sum of squared sighting-diameters, associated with KITAMURA's and MINOWA's method respectively. The former is characterized by double sampling based on both horizontal-point sampling and vertical-line sampling. This method needs to be modified into a biased-estimation type to reduce additional measurements. The latter is based on both vertical-line sampling and a kind of Monte Carlo method. First, vertical counting of trees along a line is accomplished. Next, a comparison is made between a selected uniform random digit and a sighting diameter on the bole of each counted tree, which provides the indirect measurement of the sum of squared sighting-diameters associated with the line. This method is considered to be the reverse or UENO's method which is an expansion of BITTERLICH's method to three-dimensional space. Ocular estimation can be made for the measurements of sighting diameters, making the author's method practical.
一般社団法人日本森林学会の論文
1981-07-25