calc_variables_tree_level: Calculate additional variables on tree level

In inbo/forrescalc: Calculation of Aggregated Values on Dendrometry, Regeneration and Vegetation of Forests, Starting from Individual Tree Measures from Fieldmap

Calculate additional variables on tree level

Description

This function calculates additional variables based on measurements, such as

• nr_of_stems: the number of shoots in the tree (= 1 for an individual tree; >= 1 when coppice)

• individual: true for individual tree or coppice, false if record is a secondary shoot

• calc_height_m: calculated height based on dbh_mm and a species specific diameter-height model

• basal_area_m2

• vol_bole_m3: calculated based on dbh_mm, calc_height_m and species specific tariffs

• vol_crown_m3: calculated based on dbh_mm and species specific tariffs

• vol_tot_m3: sum of vol_bole_m3 and vol_crowwn_m3

• dbh_mm (based on average for coppice trees)

• decaystage (based on average for coppice trees)

• basal_area_alive_m2_ha

• basal_area_dead_m2_ha

• vol_alive_m3_ha

• vol_dead_standing_m3_ha

• vol_bole_alive_m3_ha

• vol_bole_dead_m3_ha

Usage

calc_variables_tree_level(data_dendro, data_stems_calc)

Arguments

data_dendro	dataframe on tree measures with variables plot_id, plottype, tree_measure_id, date_dendro, dbh_mm, height_m, species, alive_dead, decaystage, period, old_id, year, subcircle, plotarea_ha,... (output of function load_data_dendrometry())
data_stems_calc	dataframe on stem level measurements with variables plot_id, plottype, tree_measure_id, date_dendro, dbh_mm, height_m, species, alive_dead, decaystage, period, year, subcircle, plotarea_ha,... (output of function calc_variables_stem_level())

Value

Dataframe with ...

Examples

library(forrescalc)
# (add path to your own fieldmap database here)
path_to_fieldmapdb <-
  system.file("example/database/mdb_bosres.sqlite", package = "forrescalc")

data_dendro <- load_data_dendrometry(path_to_fieldmapdb)
data_shoots <- load_data_shoots(path_to_fieldmapdb)
data_stems <- compose_stem_data(data_dendro, data_shoots)
# omit argument 'example_dataset = TRUE' below to use all height models
height_model <- load_height_models(example_dataset = TRUE)
data_stems_calc <- calc_variables_stem_level(data_stems, height_model)
calc_variables_tree_level(data_dendro, data_stems_calc)

inbo/forrescalc documentation built on Sept. 28, 2024, 11:45 a.m.