prepareSWD: Prepare an SWD object

Description

Given the coordinates, the species' name and the environmental variables, the function creates an SWD object (sample with data).

Usage

prepareSWD(
  species,
  env,
  p = NULL,
  a = NULL,
  categorical = NULL,
  verbose = TRUE
)

Value

An SWD object.

Arguments

species: character. The name of the species.
env: rast containing the environmental variables used to extract the values at coordinate locations.
p: data.frame. The coordinates of the presence locations.
a: data.frame. The coordinates of the absence/background locations.
categorical: vector indicating which of the environmental variable are categorical.
verbose: logical, if TRUE prints informative messages.

Author

Sergio Vignali

Details

The SWD object is created in a way that the presence locations are always before than the absence/background locations.

Examples

Run this code

# Acquire environmental variables
files <- list.files(path = file.path(system.file(package = "dismo"), "ex"),
                    pattern = "grd",
                    full.names = TRUE)

predictors <- terra::rast(files)

# Prepare presence and background locations
p_coords <- virtualSp$presence
bg_coords <- virtualSp$background

# Create the SWD object
data <- prepareSWD(species = "Virtual species",
                   p = p_coords,
                   a = bg_coords,
                   env = predictors,
                   categorical = "biome")
data

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