aggregate_treelist: Get Species Composition

In danfosterfire/Rfuels: Estimate Fuel Loads from Brown's Transects for Sierra Nevada Conifers

Description

For calculating fuel loads, we want to know the species composition of the local overstory. 'Local' means the overstory composition which is representative of the actual composition of surface fuels on the plot. Often, field data will include a treelist collected from the same plot (at the same time) as the Brown's transects. We can use this treelist to describe the species composition for each plot, and use the plot-specific species composition numbers to estimate the fuel load. 'Plot' generally means a sampling unit (e.g. a 0.04-ha sampling plot), but users could use stand-level overstory data by feeding a stand identifier into the plot_id field (as long as fuels data have the same set of stand identifiers). We express species as the proportion of total basal area occupied by each species.

Usage

aggregate_treelist(treelist)

Arguments

treelist

A treelist - a tidy dataframe with a row for each observation of an individual tree (a single tree may have multiple rows if a plot was visited more than once), and columns for plot_id, inv_date, species, and dbh_cm. See "help(validate_treelist)" for more details.

Value

A tidy data frame with a row for each observation of a sampling location (a unique combination of plot_id and inv_date), and columns for the proportion of basal area occupied by each species in the dataset for each observation. The proportion of plot basal area occupied by all species ('pBA_(all)') should always be equal to 1.

danfosterfire/Rfuels documentation built on May 28, 2019, 11:04 p.m.