| SKPar {TapeS} | R Documentation |
Data: Taper Curve models fit using R-Package TapeR
Description
Taper curve models based on a large data base of sectional measurements and
fit by TapeR_FIT_LME.f.
Usage
SKPar
Format
A list with eight elements, each a TapeR taper curve model, fit
using TapeR_FIT_LME.f. Additionally, these objects
carry two attributes: spp and name, the first refering to the
species code (cf. tprSpeciesCode) and the second
to the abbreviated german species name. These eight models refer to
the different tree species: Norway Spruce, Silver fir, Douglas fir, Scots
pine, European larch, European Beech, Oak and Northern red oak.
The spp-attributed is evaluated e.g. by the bark functions
Details
These taper curve models were developed for this package based on a collection of sectional measurements from several german forest research stations (FVA-BW, LFE, NW-FVA, TUM) and french ONF. Details for model fitting can be found in the corresponding report.
Data used to fit the models consists of
Norway spruce: n=15181, n_D=156501
European silver fir: n=7263, n_D=58988
Douglas fir: n=12019, n_D=116349
Scotch pine: n=11844, n_D=130379
larch: n=2816, n_D=25490
beech: n=16105, n_D=142691
oak (robur/petraea): n=12341, n_D=97754
Red oak: n=5411, n_D=43575
where n=number of trees and n_D=number of diameter measurements included.
Source
data collection of sectionally measured trees compiled by FVA-BW https://www.fva-bw.de
References
Vonderach und Kändler (2021): Neuentwicklung von Schaftkurvenmodellen für die Bundeswaldinventur auf Basis des TapeR-Pakets. Abschlussbericht zum Projekt BWI-TapeR im Auftrag des Thüneninstituts für Waldökosysteme.
Examples
data(SKPar)