Estimates the stem volume

Share:

Description

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.

Usage

1
  volume(trees, method = "smalian")

Arguments

trees

a data frame or matrix in format described in dataset inventory (more help inventory)

method

method used for estimation of the stem volume

Value

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

Note

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.

References

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

See Also

ff sf

Examples

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
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)