redlistr (version 2.1.0)

makeEOO: Creates Extent of occurrence (EOO) Polygon

Description

makeEOO is a generic function that creates a minimum convex polygon enclosing all occurrences of the ecosystems provided in the input data. If the input provided is a raster layer, the points are taken from a buffer that has the radius of half of the shorter edge of the pixel around the centroid.

Usage

makeEOO(input_data, names_from)

Value

An object of class sf representing the EOO of input_data, or a list of sf objects if multiple ecosystems were input. Also inherits its CRS from input_data.

Arguments

input_data

Spatial object of an ecosystem or species distribution. Please use a CRS with units measured in metres.

names_from

name of the column containing ecosystem names. If missing all features will be analysed together. Only needed for vector data.

Author

Nicholas Murray , Calvin Lee

References

IUCN 2024. Guidelines for the application of IUCN Red List of Ecosystems Categories and Criteria, Version 2.0. Keith, D.A., Ferrer-Paris, J.R., Ghoraba, S.M.M., Henriksen, S., Monyeki, M., Murray, N.J., Nicholson, E., Rowland, J., Skowno, A., Slingsby, J.A., Storeng, A.B., Valderrábano, M. & Zager, I. (Eds.) Gland, Switzerland: IUCN. ix + 94pp.

See Also

Other EOO functions: getAreaEOO(), getEOO()

Examples

if (requireNamespace("terra", quietly = TRUE)) {
  ok <- try({
     m <- matrix(sample(1:4, 500, replace = TRUE, prob = c(4,1,1,6)), nrow=25, ncol=20)
     r1 <- terra::rast(m, crs = "+proj=utm +zone=55 +south +datum=WGS84 +units=m +no_defs")
     EOO.polygon <- makeEOO(r1)
  }, silent = TRUE)
}