dyntaper-package {dyntaper}R Documentation

dyntaper: Dynamic Stem Profile Models, AKA Tree Taper Equations

Description

Performs calculations with tree taper (or stem profile) equations, including model fitting. The package implements the methods from García, O. (2015) "Dynamic modelling of tree form" http://mcfns.net/index.php/Journal/article/view/MCFNS7.1_2. The models are parsimonious, describe well the tree bole shape over its full length, and are consistent with wood formation mechanisms through time.

Details

The main functions relevant to the user are

The package includes a small example dataset, brink.

For a tutorial, see the vignette: vignette("dyntaper", package="dyntaper").

Author(s)

Maintainer: Oscar Garcia garcia@dasometrics.net (ORCID)

References

García, O. (2015) "Dynamic modelling of tree form". Mathematical and Computational Forestry & Natural-Resource Sciences (MCFNS) 7(1), 9–15. (http://mcfns.net/index.php/Journal/article/view/MCFNS7.1_2).

Koirala, A., Montes, C. R., Bullock, B. P. and Wagle, B. H. (2021) "Developing taper equations for planted teak (Tectona grandis L. f.) trees of central lowland Nepal". Trees, Forests and People 5. (doi:10.1016/j.tfp.2021.100103).

See Also

Useful links:

Examples

   dfir <- c(2.569, 0, 1.042, 0.3012, -1)  # params. for D.fir in B.C.
   height <- 32; dbh <- 24;  k <- 0.956  # k is a bark conversion factor
   # Plot a taper curve (inside-bark diameter over height levels):
   curve(
     taper(h, height, k*dbh, dfir, 1.3),  # 1.3 m is the breast height
   from = 0, to = 32, xname = "h")
   # Height level for a diameter of 10 cm (i.b.):
   (h10 <- hlevel(10, height, k*dbh, dfir, 1.3))
   # Volume from a 30 cm stump to a 10 cm diameter limit:
   volume(0.3, h10, height, k*dbh, dfir, 1.3, 100)


[Package dyntaper version 1.1 Index]