redlistr (version 1.0.1)

makeAOOGrid: Create Area of Occupancy (AOO) grid for an ecosystem or species distribution

Description

makeAOOGrid creates grids for species presence based on the presented raster object. It includes capability for specifying whether a minimum percent of the grid cell needs to be occupied before it is counted in the AOO. This functionality is important for assessing the IUCN Red List of Ecosystems Criteria B.

Usage

makeAOOGrid(input.data, grid.size, min.percent.rule = FALSE, percent = 1)

Arguments

input.data

Object of an ecosystem or species distribution. Accepts either raster or spatial points formats. Please use a CRS with units measured in metres.

grid.size

A number specifying the width of the desired grid square (in same units as your coordinate reference system)

min.percent.rule

Logical. If TRUE, a minimum area threshold must be passed before a grid is counted as an AOO grid.

percent

Numeric. The minimum percent to be applied as a threshold for the min.percent.rule

Value

A shapefile of grid cells occupied by an ecosystem or species

References

Bland, L.M., Keith, D.A., Miller, R.M., Murray, N.J. and Rodriguez, J.P. (eds.) 2016. Guidelines for the application of IUCN Red List of Ecosystems Categories and Criteria, Version 1.0. Gland, Switzerland: IUCN. ix + 94pp. Available at the following web site: https://iucnrle.org/

See Also

Other AOO functions: createGrid, getAOOSilent, getAOO

Examples

# NOT RUN {
crs.UTM55S <- '+proj=utm +zone=55 +south +ellps=WGS84 +datum=WGS84 +units=m +no_defs'
r1 <- raster(ifelse((volcano<130), NA, 1), crs = crs.UTM55S)
extent(r1) <- extent(0, 6100, 0, 8700)
AOO_grid <- makeAOOGrid(r1, 10000, min.percent.rule = TRUE, percent = 1)
# }