Calculate Tree Volume — silv_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_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_volume(diameter_base = 30, height = 20, formula = "pressler")
#> ! When using Pressler formula, the height is assumed to be Pressler directrix point (i.e., the height at which the diameter of the stem is half the diameter in the base of the tree).
#> [1] 9424.778
silv_volume(diameter_center = 25, height = 15, formula = "huber")
#> [1] 7363.108
silv_volume(diameter_base = 30, diameter_top = 20, height = 20, formula = "smalian")
#> [1] 10210.18