trees_per_ha.concentric_design: Compute trees per hectare for concentric subplot designs

In basifoR: Retrieval and Processing of the Spanish National Forest Inventory

Compute trees per hectare for concentric subplot designs

Description

Return the trees-per-hectare expansion factor for a tree measured under a concentric subplot design.

Usage

## S3 method for class 'concentric_design'
trees_per_ha(design, 
    dbh_cm)

Arguments

design	Object of class "concentric_design" created by helpers such as new_concentric_design or snfi_design.
dbh_cm	numeric. Diameter at breast height in cm. When several values are supplied, the method uses their mean after removing missing values.

Details

It returns NA_real_ when all supplied diameters are

missing or when the resulting diameter is smaller than the

smallest subplot threshold.

Value

A single numeric expansion factor in trees per hectare

taken from design$sf, or NA_real_ when the tree

does not belong to any subplot tier.

Author(s)

Wilson Lara [aut, cre] (ORCID: <https://orcid.org/0000-0003-3527-1380>), Cristobal Ordonez [aut] (ORCID: <https://orcid.org/0000-0001-5354-3760>), Aitor Vázquez-Veloso [aut] (ORCID: <https://orcid.org/0000-0003-0227-506X>), Felipe Bravo [aut] (ORCID: <https://orcid.org/0000-0001-7348-6695>)

Examples

trees_per_ha(snfi_design(), 13)

basifoR documentation built on Aug. 26, 2026, 9:06 a.m.