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Articles containing the keyword 'measurement combination'
Category : Research article
article id 522,
category
Research article
(2002).
Anticipating the variance of predicted stand volume and timber assortments with respect to stand characteristics and field measurements.
Silva Fennica
vol.
36
no.
4
article id 522.
https://doi.org/10.14214/sf.522
Keywords:
diameter distribution;
timber assortment;
prediction;
calibration estimation;
volume;
accuracy;
measurement combination
Abstract |
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Author Info
Several models and/or several variable combinations could be used to predict the diameter distribution of a stand. Typically, a fixed model and a fixed variable combination is used in all conditions. The calibration procedure, however, makes it possible to choose the measurement combination from among many possibilities, although the model used is fixed. In this study, the usefulness of utilizing additional stand characteristics for calibrating the predicted diameter distribution is examined. Nine measurement strategies were tested in predicting the total stand volume, sawlog volume and pulpwood volume. The observed errors of these variables under each strategy were modeled as a function of basal area, basal area median diameter and number of stems. The models were estimated in three steps. First, an Ordinary Least Squares (OLS) model was fitted to the observed errors. Then, a variance function was estimated using the OLS residuals. Finally, a weighted Seemingly Unrelated Regression (SUR) analysis was used to model the observed errors, using the estimated variance functions as weights. The estimated models can be used to anticipate the precision and accuracy of predicted volume characteristics for each stand with different variable combinations and, consequently, to choose the best measurement combination in different stands.
-
Kangas,
University of Helsinki, Dept. of Forest Resources Management, P.O. Box 27, 00014 University of Helsinki, Finland
E-mail:
annika.kangas@helsinki.fi
- Maltamo, University of Joensuu, Faculty of Forestry, P.O. Box 111, 80101 Joensuu, Finland E-mail: mm@nn.fi
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