age_d_gnfi3_core

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

internal

Provides generic data structures and algorithms for use with forest
mensuration data in a consistent framework. The functions and objects
included are a collection of broadly applicable tools. More specialized
applications should be implemented in separate packages that build on this
foundation. Documentation about 'ForestElementsR' is provided by three
vignettes included in this package. For an introduction to the field of
forest mensuration, refer to the textbooks by Kershaw et al. (2017)
<doi:10.1002/9781118902028>, and van Laar and Akca (2007)
<doi:10.1007/978-1-4020-5991-9>.

Peter Biber

ForestElementsR

Data Structures and Functions for Working with Forest Data

Astor Toraño Caicoya

Torben Hilmers

age_d_gnfi3_core function

<dl><dt>species_id</dt>
<dd>Vector of species ids (see <code>age_d_gnfi3</code>),
but for this core function to work, <code>species_id</code> must be provided as
<code>character</code>. 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 <code>param_orig</code> must be TRUE,
in the latter, it must be FALSE.</dd>
<dt>dbh_cm</dt>
<dd>Single numeric value or vector of dbh (cm) for which the
age is to be estimated</dd>
<dt>dbh_cm_known</dt>
<dd>Vector of known dbh (cm) values at age
<code>age_yr_known</code></dd>
<dt>age_yr_known</dt>
<dd>Vector of ages (years) for which the dbh
<code>d_cm_known</code> is known</dd>
<dt>params</dt>
<dd>A data frame that defines the function parameters corresponding
to the species coding represented by <code>species_id</code></dd></dl>

Arguments

Core Function For the Inverse Stem Diameter Growth Model of the 3rd German
National Forest Inventory (2012) — age_d_gnfi3_core

<dl>

<dt>species_id</dt>
<dd>Vector of species ids (see <code>age_d_gnfi3</code>),
but for this core function to work, <code>species_id</code> must be provided as
<code>character</code>. 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 <code>param_orig</code> must be TRUE,
in the latter, it must be FALSE.</dd>


<dt>dbh_cm</dt>
<dd>Single numeric value or vector of dbh (cm) for which the
age is to be estimated</dd>


<dt>dbh_cm_known</dt>
<dd>Vector of known dbh (cm) values at age
<code>age_yr_known</code></dd>


<dt>age_yr_known</dt>
<dd>Vector of ages (years) for which the dbh
<code>d_cm_known</code> is known</dd>


<dt>params</dt>
<dd>A data frame that defines the function parameters corresponding
to the species coding represented by <code>species_id</code></dd>

</dl>

age_d_gnfi3_core: Core Function For the Inverse Stem Diameter Growth Model of the 3rd German National Forest Inventory (2012)

Description

Usage

Value

Arguments

Details