generate.log.vols: Generates log volumes given a dataframe that contains stem...

In FAwR: Functions and Datasets for "Forest Analytics with R"

Generates log volumes given a dataframe that contains stem measurements.

Description

This function generates a dataframe object that contains the original stem measurements and appends columns named by log.grades, where log.grades corresponds to the minimum log diameters defined by log.breaks.

Usage

generate.log.vols( x,
		   log.breaks=c(2,5,12,18,32,999),
                   log.grades=c("pulp","s4","s3","s2","s1","peeler"),
                   display.stems=FALSE	 )

Arguments

x	The dataframe containing the original stem measurements.
log.breaks	The vector defining the minimum diameters for the log grades defined by log.grades.
log.grades	The vector defining the text labels for the log.breaks.
display.stems	The control switch to display stems as they are being merchanised.

Details

The function contains supporting function to determine the merchantable stem height, then tallies the amount of Smalian log volume, in each of the log.grades. The resulting dataframe is then converted to be appended to each tree record in x. Normally, it would not be called directly.

Value

A dataframe that contains the original stem measurements with the log volumes appended.

Author(s)

Jeff D. Hamann <[e-mail]>

References

Robinson, A.P., and J.D. Hamann. 2010. Forest Analytics with R: an Introduction. Springer.

See Also

is.na

Examples

# test <- data.frame(a = c(1,2), b = c(3,4))
# show.cols.with.na(test)
# is.na(test$a[2]) <- TRUE
# show.cols.with.na(test)

FAwR documentation built on June 22, 2025, 5:07 p.m.