Estimate tree volume using Zakrzewski (2013) taper model (Ontario)

Usage

vol_zakrzewski2013(DBH, height, species)

Source

Zakrzewski, W. T., Penner, M. (2013). A Comparison of Tree Stem Taper Models for Use in Ontario. Ontario Forest Research Institute, Report 176.

Arguments

DBH: Numeric vector of diameter at breast height (cm).
height: Numeric vector of total tree height (m).
species: Character vector of species codes

Value

A tibble with volumes (m^3): total and merchantable.

Note

Implementation is based on an original R script provided by Margaret Penner, refactored for CanadaForestAllometry (vectorized inputs, standardized species codes, and merchantability criteria via get_merch_criteria).

Examples

# Single tree
vol_zakrzewski2013(
  DBH = 20,
  height = 22,
  species = "PICE.MAR"
)
#> # A tibble: 1 × 2
#>   vol_total vol_merchantable
#>       <dbl>            <dbl>
#> 1     0.304            0.278

# Vectorized input (multiple trees)
vol_zakrzewski2013(
  DBH = c(20, 30, 40),
  height = c(18, 22, 28),
  species = c("PICE.MAR", "PINU.STR", "THUJ.OCC")
)
#> # A tibble: 3 × 2
#>   vol_total vol_merchantable
#>       <dbl>            <dbl>
#> 1     0.254            0.229
#> 2     0.672            0.616
#> 3     1.22             1.16