findAdultTrees: Find Adult Trees Around A Set Of Points

In ecology-rocks/disperseR: Calculating Spatial Seed Dispersal Rates

Description

This function finds the individual adult trees within "m" distance of each seedling subplot in seedPlots. seedPlots and adults are both data.frames, and m is the search distance.

Usage

findAdultTrees(seedPlots, adults, m)

Arguments

seedPlots	A data.frame containing "x", "y" and "n", the geographic location of seedling plots and the number of seedlings contained within those plots.
adults	A data.frame containing "x", "y" and "dbh" of adult trees in the plot, along with a unique identifier "treeid".
m	The search radius, from the center of the seedling Plot. This does not take into account the previous "m" for seedling subplots that were generated.

Value

This function returns a data.frame with "treeid", "ri", "m" and "dbh". "ri" is the number of seedlings in the subplot that was "m" distance from the tree labeled "treeid" with a "dbh".

Examples

#' ## make a sample seed data.frame by subsetting the included
## expandedTrees data.frame..
sampleseeds <- expandedTrees[expandedTrees$plot=="trinity" &
                             expandedTrees$measyear==2001 &
                             expandedTrees$stage=="seedling" &
                             expandedTrees$species=="ABCO",]
## get subplots
seedlingPlots <- findSeedPlots(sampleseeds, 1)
## get adult trees
sampleadults <- expandedTrees[expandedTrees$plot=="trinity" &
                             expandedTrees$measyear==2001 &
                             expandedTrees$stage=="tree" &
                             expandedTrees$species=="ABCO",]
## run function
adults <- findAdultTrees(seedlingPlots, sampleadults, 20)

## look at data
head(adults)
nrow(adults)

ecology-rocks/disperseR documentation built on May 15, 2019, 7:58 p.m.