bdq_meyer function

Classify a forest for selective cutting using the Meyer BDq method

This function can be used to plan and execute selective cuttings of a native forest, without damaging the forest's natural structure.

bdq_meyer(
  df,
  plot,
  dbh,
  plot_area,
  class_interval = 5,
  dbh_min = 5,
  licourt_index = 2,
  output = "table"
)

Arguments

• df: A data frame.
• plot: Quoted name of the plot variable. used to differentiate the plot's trees, and calculate the number of sampled plots.
• dbh: Quoted name of the diameter at breast height variable, in cm.
• plot_area: Quoted name of the plot area variable, or a numeric vector with the plot area value. The plot area value must be in square meters.
• class_interval: Numeric value for the class interval used to classify the data. Default: 5.
• dbh_min: Numeric value for minimum diameter value to be considered in the classifications. dbh values smaller than this will be dismissed from the classification. Default: 5.
• licourt_index: Numeric value for the start licourt index used. Default: 2.
• output: Character value for the desired output. Can be either "table" for the classified data table, "model" to get a lm object with the linear model fitted, "coefs" to get a vector with the Meyer coefficients, or "full", to get a list with all restuls. Default: "table".

Returns

a data frame, a lm object, a vector or a list, according to the output argument.

Examples

library(forestmangr)
data("exfm20")
head(exfm20)

# To get the table with the regulated forest:
bdq_meyer(exfm20, "transect", "dbh", 1000)

# Use different class interval values to get different results:
bdq_meyer(exfm20, "transect", "dbh", 1000, class_interval = 10)

# It's possible to get different outputs:
bdq_meyer(exfm20, "transect", "dbh", 1000, output="model")
bdq_meyer(exfm20, "transect", "dbh", 1000, output="coefs")
bdq_meyer(exfm20, "transect", "dbh", 1000, output="full")

References

Souza, A. L. and Soares, C. P. B. (2013) Florestas Nativas: estrutura, dinamica e manejo. Vicosa: UFV.

Author(s)

Eric Bastos Gorgens e.gorgens@gmail.com