Profile models for estimating log end diameters in the Rocky Mountain Region

Ray L. Czaplewski; Amy S. Brown; Raymond C. Walker

doi:10.2737/RM-RP-284

Treesearch

Profile models for estimating log end diameters in the Rocky Mountain Region

Informally Refereed

Authors:

Ray L. Czaplewski, Amy S. Brown, Raymond C. Walker

Year:

1989

Type:

Research Paper

Station:

Rocky Mountain Research Station

DOI:

https://doi.org/10.2737/RM-RP-284

Source:

Res. Pap. RM-RP-284. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station. 7 p.

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Download (PDF 362 KB): https://research.fs.usda.gov/download/treesearch/39930.pdf

Abstract

The segmented polynomial stem profile model of Max and Burkhart was applied to seven tree species in the Rocky Mountain Region of the Forest Service. Errors were reduced over the entire data set by use of second-stage models that adjust for transformation bias and explained weak patterns in the residual diameter predictions.

Keywords

Taper equations, merchantable volume estimates, bias correction, Abies concolor, Abies lasiocarpa, Picea engelmannii, Pinus con- torta, Pinus ponderosa, Pseudotsuga menziesii, Populus tremuloides

Citation

Czaplewski, Raymond L.; Brown, Amy S.; Walker, Raymond C. 1989. Profile models for estimating log end diameters in the Rocky Mountain Region. Res. Pap. RM-RP-284. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station. 7 p.