Calculate Tree Volume — silv_tree_volume • silviculture

This function calculates the volume of a tree or logs using different formulas: Pressler, Huber, Smalian, and Newton. The appropriate diameter and height parameters must be provided depending on the selected formula.

Usage

silv_tree_volume(
  diameter_base = NULL,
  diameter_top = NULL,
  diameter_center = NULL,
  diameter = NULL,
  height = NULL,
  formula = "pressler",
  ntrees = NULL
)

Arguments

diameter_base: A numeric vector. The diameter at the base of the tree (required for Pressler, Smalian, and Newton formulas).
diameter_top: A numeric vector. The diameter at the top of the tree (required for Smalian and Newton formulas).
diameter_center: A numeric vector. The diameter at the center of the tree (required for Huber and Newton formulas).
diameter: A numeric vector. The diameter at breast height (used in Pressler formula if provided instead of diameter_base).
height: A numeric vector. The tree or log height (required for all formulas).
formula: Character. The volume formula to use. Options: "pressler", "huber", "smalian", "newton". Default is "pressler".
ntrees: A numeric vector with number of trees of the same dimensions. Default is 1.

Value

A numeric value representing the tree volume.

Examples

silv_tree_volume(diameter_base = 30, height = 20, formula = "pressler")
#> ! When using Pressler formula, height is assumed to be the Pressler directrix point (i.e., the height at which the stem diameter is half the base diameter).
#> [1] 0.9424778
silv_tree_volume(diameter_center = 25, height = 15, formula = "huber")
#> [1] 0.7363108
silv_tree_volume(diameter_base = 30, diameter_top = 20, height = 20, formula = "smalian")
#> [1] 1.021018