BSplines

Internal function not usually called by users

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 section-wise diameter measurements of these trees. The functions
implemented here are detailed in Kublin, E., Breidenbach, J., Kaendler, G. (2013)
<doi:10.1007/s10342-013-0715-0>.

Christian Vonderach

TapeR

Flexible Tree Taper Curves Based on Semiparametric Mixed Models

Edgar Kublin

Johannes Breidenbach

BSplines function

<dl><dt>knots</dt>
<dd>knot positions for spline function</dd>
<dt>ord</dt>
<dd>order of the spline function</dd>
<dt>der</dt>
<dd>derivatives</dd>
<dt>x</dt>
<dd>height measurements</dd>
<dt>...</dt>
<dd>not currently used</dd></dl>

Arguments

Author

builds B-Splines Matrix with appropriate knots for taper fitting — BSplines

<dl>

<dt>knots</dt>
<dd>knot positions for spline function</dd>


<dt>ord</dt>
<dd>order of the spline function</dd>


<dt>der</dt>
<dd>derivatives</dd>


<dt>x</dt>
<dd>height measurements</dd>


<dt>...</dt>
<dd>not currently used</dd>

</dl>

BSplines: builds B-Splines Matrix with appropriate knots for taper fitting

Description

Usage

Value

Arguments

Author

Details