TapeR-package {TapeR}

Flexible tree taper curves based on Semiparametric Mixed Models.

Description

This package implements functions for fitting taper curves (a semiparametric linear mixed effects taper model) to diameter measurements along stems. Further functions are provided to estimate the variance/confidence intervals around the predicted curves, to calculate timber volume (also by sections) and marginal (e.g., upper) diameters. For cases where tree heights are not measured, methods for estimating additional variance in volume predictions resulting from uncertainties in tree height models (tariffs) are provided. The example data include the taper curve parameters for Norway spruce used in the 3rd German NFI fitted to 380 trees and a subset of section-wise diameter measurements of these trees.

Details

Package:	TapeR
Type:	Package
License:	GPL-2
LazyLoad:	yes

Fits taper models using diameter measurements along the stem. Uses fitted models and arbitrary numbers of diameter measurements to estimate diameter at any position along the stem. Estimates timber volume from the taper curve. Provides variances for all estimates.

Author(s)

Edgar Kublin

Maintainer: Johannes Breidenbach <[e-mail]>

References

Kublin, E., Breidenbach, J., Kaendler, G. (2013) A flexible stem taper and volume prediction method based on mixed-effects B-spline regression, Eur J For Res, 132:983-997.

See Also

TapeR_FIT_LME.f, E_DHx_HmDm_HT.f, DxHx.df, SK.par.lme, HT.par