This function generates pseudo-absences outside a buffer around presence points but within the convex hull of those points. This prevents spatial overlap while preserving geographic realism.
generate_pa_buffer_out(
presences,
raster_stack,
predictor_variables,
coords = c("decimalLongitude", "decimalLatitude"),
pa_buffer_distance = 0.5,
ratio = 1,
attempts = 100,
seed = NULL
)A data frame of pseudo-absences with coordinates, timestamp, `pa = 0`, and covariate values.
Data frame containing presence points.
`SpatRaster` object containing covariate data.
Character vector of the predictor variables selected for this species.
Character vector specifying the column names for latitude and longitude. Defaults to `c("decimalLongitude", "decimalLatitude")`.
Numeric; buffer radius in degrees around each presence. Default is 0.5.
Ratio of pseudo-absences to presences (default 1 = balanced).
Integer specifying the number of attempts to generate exact pseudo-absences. Defaults to 100.
Optional seed for reproducibility.