trlhawaii: Tree-level information of forest plots across the Hawaiian...
In biometrics: Functions and Datasets for Forest Biometrics and Modelling

trlhawaii

R Documentation

Tree-level information of forest plots across the Hawaiian archipelago.

Description

Diameter at breast height (or occurrence) of individual trees, shrubs and tree ferns across 530 plots across the Hawaiian archipelago and includes native status and cultivated status of the 185 species.

Usage

data(trlhawaii)

Format

Contains 18 variables, as follows:

island: Island name.
plot.id: Unique numeric identifier for each plot.
study: Brief name of study.
plot.area: Plot area in m^{2}.
longitude: Longitude of plot in decimal degrees; WGS84 coordinate system.
latitude: Latitude of plot in decimal degrees; WGS84 coordinate system.
year: Year in which plot data was collected.
census: Numeric identifier for each census.
tree.id: Unique numeric identifier for each individual.
scientific.name: Genus and species of each individual following TPL v. 1.1.
family: Family of each individual following TPL v. 1.1.
angiosperm: Binary variable (1 = yes, 0 = no) indicating whether an individual is classified as an angiosperm following APG III.
monocot: Binary variable (1 = yes, 0 = no) indicating whether an individual is classified as a monocot following APG III.
native.status: Categorical variable ("native", "alien", "uncertain") indicating alien status of each individual following Wagner et al. (2005).
cultivated.status: Binary variable (1 = yes, 0 = no, NA = not applicable) indicating if species is cultivated following PIER.
abundance: Number of individuals (all = 1).
abundance.ha: Abundance of each individual on a per hectare basis.
dbh: Diameter at 1.3 m (in cm) for each individual; NA indicates that size was not measured, but was classified by size class.

Source

The data were obtained from the DRYAD repository at \Sexpr[results=rd]{tools:::Rd_expr_doi("10.5061/dryad.1kk02qr")}.

References

- Craven D, Knight T, Barton K, Bialic-Murphy L, Cordell S, Giardina C, Gillespie T, Ostertag R, Sack L,Chase J. 2018. OpenNahele: the open Hawaiian forest plot database. Biodiversity Data Journal 6: e28406.

Examples

data(trlhawaii)  
table(trlhawaii$island,trlhawaii$study)   
unique(trlhawaii$plot.id) 
table(trlhawaii$plot.id) 
tapply(trlhawaii$plot.area,trlhawaii$study,summary)

biometrics documentation built on April 4, 2025, 12:35 a.m.