getAOO: Compute Area of Occupancy (AOO)

Description

getAOO determines the number of area of occupancy (AOO) grid cells occupied by a species or ecosystem. It includes capability for specifying whether at least one 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

getAOO(
  input_data,
  cell_size = 10000,
  names_from = NA,
  bottom_1pct_rule = TRUE,
  percent = 1,
  jitter = 150,
  n_jitter = 35
)

Value

an object of class AOOgrid or a list of AOOgrid objects. Ecosystems that received an AOO of 60 cells or fewer on a first pass are run with a jittered grid with n specified by n_jitter

Arguments

input_data: Spatial object (sf or SpatRaster) of an ecosystem or species distribution. Please use a CRS with units measured in metres.
cell_size: A number specifying the width of the desired grid square (in same units as your coordinate reference system)
names_from: the name of the column containing ecosystem labels
bottom_1pct_rule: Logical. If TRUE, grid cells containing the least ecosystem area are dropped up to 1% of the total distribution.
percent: Numeric. The minimum percent to be applied as a threshold for the bottom_1pct_rule
jitter: Integer. 0 = do not jitter, 1 = force jitter, another number indicates conditional jitter, the number of AOO cells under which to jitter, and over which not to jitter the grid.
n_jitter: the number of grids to test for ecosystems near the AOO thresholds. Ignored if jitter = FALSE.

Author

Nicholas Murray murr.nick@gmail.com, Calvin Lee calvinkflee@gmail.com, Aniko B. Toth anikobtoth@gmail.com

References