age_d_gnfi3_core: Core Function For the Inverse Stem Diameter Growth Model of...

In ForestElementsR: Data Structures and Functions for Working with Forest Data

Core Function For the Inverse Stem Diameter Growth Model of the 3rd German National Forest Inventory (2012)

Description

See documentation of age_d_gnfi3 for most information, this function is the workhorse behind, and should never be called directly by a user.

Usage

age_d_gnfi3_core(species_id, dbh_cm, dbh_cm_known, age_yr_known, params)

Arguments

species_id	Vector of species ids (see age_d_gnfi3), but for this core function to work, species_id must be provided as character. This will and should be not checked inside this function, because if used as intended, that has happened before calling it. The codings must either follow the ger_nfi_2012 or the tum_wwk_short coding. In the former case, the parameter param_orig must be TRUE, in the latter, it must be FALSE.
dbh_cm	Single numeric value or vector of dbh (cm) for which the age is to be estimated
dbh_cm_known	Vector of known dbh (cm) values at age age_yr_known
age_yr_known	Vector of ages (years) for which the dbh d_cm_known is known
params	A data frame that defines the function parameters corresponding to the species coding represented by species_id

Details

The function age_d_gnfi3 is fully vectorized, inputs are recyled according to the tibble rules

Value

A vector with estimates of the trees' expected dbh (see age_d_gnfi3)

ForestElementsR documentation built on April 3, 2025, 7:47 p.m.