forestmangr: smalianwob – R documentation

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smalianwob

Calculate the volume without bark of trees using the Smalian method

Description

Function used to calculate the volume without bark of trees using the Smalian method. This function has integration with dplyr, so it can be used inside a pipe, along with the group_by function.

Usage

smalianwob(
  df,
  di,
  hi,
  bt,
  tree,
  .groups = NA,
  di_mm_to_cm = FALSE,
  hi_cm_to_m = FALSE,
  bt_mm_to_cm = FALSE
)

Arguments

`df`	A data frame.
`di`	Quoted name of the section diameter variable, in centimeters.
`hi`	Quoted name of the section height variable, in meters
`bt`	Quoted name of the bark thickness variable, in centimeters.
`tree`	Quoted name of the tree variable. used to differentiate the trees' sections. If this argument is `NA`, the defined groups in the data frame will be used. Default: `NA`.
`.groups`	Optional argument. Quoted name(s) of additional grouping variables that can be added to differentiate subdivisions of the data. If this argument is `NA`, the defined groups in the data frame will be used. Default: `NA`.
`di_mm_to_cm`	Boolean argument that, if `TRUE`, converts the di argument from milliliters to centimeters. Default: `FALSE`.
`hi_cm_to_m`	Boolean argument that, if `TRUE`, converts the hi argument from centimeters to meters. Default: `FALSE`.
`bt_mm_to_cm`	Boolean argument that, if `TRUE`, converts the bt argument from milliliters to centimeters. Default: `FALSE`.

Value

Data frame with volume values by section.

Author(s)

Sollano Rabelo Braga sollanorb@gmail.com

References

Campos, J. C. C. and Leite, H. G. (2017) Mensuracao Florestal: Perguntas e Respostas. 5a. Vicosa: UFV.

Examples

library(forestmangr)
data("exfm7")
exfm7

# Calculate the volume without bark using Smalian's method:
smalianwob(exfm7,"di_wb", "hi", "bark_t", "TREE")

# Using pipes:
library(dplyr)

 exfm7 %>% 
 group_by(TREE) %>% 
 smalianwob("di_wb", "hi", "bark_t")

forestmangr

Forest Mensuration and Management

v0.9.3

MIT + file LICENSE

Authors

Sollano Rabelo Braga [aut, cre, cph], Marcio Leles Romarco de Oliveira [aut], Eric Bastos Gorgens [aut]

Initial release

2021-01-24