Notes: Validation of a Butt Log Volume Estimator for Douglas-fir

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Data were collected from 193 Douglas-fir butt logs to validate the Bruce equation for estimating volume of butt logs. Average bias was 0.04 cubic feet and average accuracy (mean absolute deviation) was 3.7 cubic feet. The Bruce equation is recommended for estimating volume of Douglas-fir butt logs except when the butt log extends into the live crown. Forest Sci. 31:643-646.

Keywords: Pseudotsuga menziesii; volume equations

Document Type: Miscellaneous

Affiliations: Forest Products Technologist, USDA Forest Service, Pacific Northwest Forest and Range Experiment Station, P.O. Box 3890, Portland, OR 97208

Publication date: September 1, 1985

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