Implementation of functions for fitting taper curves (a semiparametric linear mixed effects taper model) to diameter measurements along stems. Further functions are provided to estimate the uncertainty 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 sectionwise diameter measurements of these trees. The functions implemented here are detailed in the following publication: Kublin, E., Breidenbach, J., Kaendler, G. (2013) A flexible stem taper and volume prediction method based on mixedeffects Bspline regression, Eur J For Res, 132:983997.
Package details 


Author  Edgar Kublin [aut], Johannes Breidenbach [ctb, cre] 
Maintainer  Johannes Breidenbach <job@nibio.no> 
License  GPL (>= 2) 
Version  0.3.3 
Package repository  View on CRAN 
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