volume: Estimates the stem volume
In FI: Provide functions for forest inventory calculations

Description Usage Arguments Value Note References See Also Examples

volume uses one of the following methods (Smalian, Newton, Huber) to approximate real stem volume. Users should remember they're just approximations and sample size provide more accurate results them using different methods.

1	volume(trees, method = "smalian")

`trees`	a data frame or matrix in format described in dataset inventory (more help `inventory`)
`method`	method used for estimation of the stem volume

a named vector of volumes, names are defined as same as in first column

Newton and Huber methods have small modifications for working just with two mensures (lower and upper diameter). Both of them use mean instead of real middle diameter.

http://wiki.awf.forst.uni-goettingen.de/wiki/index.php/Stem_volume

ff sf

example_data <- data.frame(tree_number = 1,
                           dhb = 5,
                           total_height = 20,
                           comercial_height = 15,
                           section_height = c(0,5,15),
                           section_diameter = 5
                           )
volume(example_data)
#
#
# A little more complex and common example
data(inventory)
volume_output <- volume(inventory)
summary(volume_output)
hist(volume_output)