Estimation of taper curve using stand variables and sample tree measurements

Autor:	Juha Lappi, Pekka Kilkki
Rok vydání:	1987
Předmět:	Forest inventory Sample plot Statistics Principal component analysis Combined use Diameter at breast height Forestry Regression analysis Polar coordinate system Mathematics Tree measurement
Zdroj:	Scandinavian Journal of Forest Research. 2:121-126
ISSN:	1651-1891 0282-7581
DOI:	10.1080/02827588709382451
Popis:	The aim of the study was to develop methods for estimating the taper curves for trees tallied in a forest inventory. The average stem form in a stand was described by the principal components of the stand effects in the stem dimensions measured in the polar coordinate system. Measurements of diameter at breast height, diameter at a height of 6 meters, and height taken from trees on the sample tree plots were used for determining the first four principal components. Regression models were derived to predict the principal components from the site and growing stock variables. These models were used to estimate the taper curves of the tallied trees. Use of the principal components estimated by the regression models gave less reliable results than use of the principal component estimates based on measurement of the height of one randomly chosen tree on the sample plot. The best result was found with combined use of the principal component estimates and one height measurement per sample plot.
Databáze:	OpenAIRE
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