ecospat.occ.desaggregation {ecospat}

Species Occurrences Desaggregation

Description

Remove species occurrences in a dataframe which are closer to each other than a specified distance threshold.

Usage

ecospat.occ.desaggregation (xy, min.dist, by)

Arguments

xy

A dataframe with xy-coordinates (x-column must be named 'x' and y-column 'y')

min.dist

The minimun distance between points in the sub-dataframe.

by

Grouping element in the dataframe (e.g. species, NULL)

Details

This function will desaggregate the original number of occurrences, according to a specified distance.

Value

A subset of the initial dataframe. The number of points is printed as "initial", "kept" and "out".

Author(s)

Frank Breiner [e-mail]

with contributions of Olivier Broennimann [e-mail]

Examples

spp <- ecospat.testNiche
colnames(spp)[2:3] <- c('x','y')
sp1 <- spp[1:32,2:3]

occ.sp1 <- ecospat.occ.desaggregation(xy=sp1, min.dist=500, by=NULL)
occ.all.sp <- ecospat.occ.desaggregation(xy=spp, min.dist=500, by='Spp')