volume: Stem volume

In cszang/sawmill: Metrics for Forest Growth and Yield Science

Description

Calculate stem volume based on height, diameter and species

Usage

volume(d, h, species = "fagus_sylvatica")

Arguments

d	numeric vector with stem diameters in 1.3 m height in cm
h	numeric vectors with height in m
species	character

Details

This function uses the approximation function of Franz et al. (1973) to calculate the stem volume based on the species specific form number. It is estimated in two steps: a first level of functions is derived by species and diameter, then this set of functions enters the final approximation function which depends on height alone.

At the moment, only beech and spruce are implemented.

Value

numeric vector with volume of the trees in cubic metres

Examples

volume(30:35, 20:25, "fagus_sylvatica")

cszang/sawmill documentation built on May 14, 2019, 12:27 p.m.