prepareSWD: Prepare an SWD object

In SDMtune: Species Distribution Model Selection

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
)

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.

Details

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

Value

An SWD object.

Author(s)

Sergio Vignali

Examples

# 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

SDMtune documentation built on Aug. 28, 2025, 1:10 a.m.