env_thin: Thinning of occurrence records using environmental...

In HemingNM/ENMwizard: Advanced Techniques for Ecological Niche Modeling Made Easy

Thinning of occurrence records using environmental information

Description

The function thins spatial points to minimize biases in the environmental space. It divides de range of variables into a desired number of @param bins and selects points closer to the bin center.

Usage

env_thin(
  p,
  predictors,
  long.col = NULL,
  lat.col = NULL,
  bins = 20,
  file = NULL,
  plot = F,
  verbose = F
)

Arguments

p	Two column matrix or data.frame with point coordinates or SpatialPoints of occurrence records.
predictors	Raster-class object of environmental predictor variables.
lat.col, long.col	Name of columns that contain coordinates (latitude and longitude)
bins	Number of bins to divide each environmental variable.
file	either a character string naming a file or a connection open for writing.
plot	Logical. Should results be plotted?
verbose	Logical. Should information be printed on screen?

Value

A data.frame, matrix, sp or sf object containing the selected records.

See Also

env_thin_b, load_env_thin_occ

Examples

## Not run: 
file <- paste(system.file(package="dismo"), "/ex/bradypus.csv", sep="")
bradypus <- read.table(file, header=TRUE, sep=',')
coord <- bradypus [,2:3]

# Download data for present
dir.create("rasters")
library(raster)
predictors <- getData('worldclim', var='bio', res=10, path="rasters")

#cor(data)
#vars <- ENMwizard::select_vars(cutoff = 0.9, corr.mat = cor(data), names.only = T)[[1]]
#length(vars)
env_thin(coord, predictors)

## End(Not run)

HemingNM/ENMwizard documentation built on Jan. 4, 2024, 3:24 p.m.