gridUncertaintyBase helps determine the minimum number of area of
occupancy (AOO) grid cells occupied by a species or ecosystem. It varies the
location of the AOO grid by shifting in systematically in both x- and y-
axes, adding a small amount of random movement (five percent of the
grid.size) at each point. It then returns summary statistics for the
range of AOOs calculated, and the RasterLayer(s) containing the grids with
the minimum AOO. It is the base function which is used by
gridUncertainty, gridUncertaintySimulation, and
gridUncertaintyRestricted
gridUncertaintyBase(
input.data,
grid.size,
splits,
min.percent.rule = FALSE,
percent = 1,
restriction = FALSE,
min.grids.shift
)List containing the following:
Vector of length split*split of calculated AOO for each shifted grid
Data frame of summary statistics for the results create the AOO grid(s) which return the smallest AOO
Data frame of the shift(s) required to create the AOO grid(s) with the smallest AOO
Spatial object of an ecosystem or species distribution. Please use a CRS with units measured in metres.
A number specifying the width of the desired grid square (in same units as your coordinate reference system)
Specifies the number of ways to split the grid in ONE axis.
Logical. If TRUE, a minimum area threshold
must be passed before a grid is counted as an AOO grid.
Numeric. The minimum percent to be applied as a threshold for
the min.percent.rule.
Logical. If TRUE, allows user to specify areas to
focus where grid search is done. Used in gridUncertaintyRestricted.
Dataframe object with two columns (x.shift and y.shift) specifying the coordinates to restrict the AOO grid placement.
Nicholas Murray murr.nick@gmail.com, Calvin Lee calvinkflee@gmail.com
createGrid() getAOOSilent()
Other gridUncertainty functions:
gridUncertaintyRandomManual(),
gridUncertaintyRandom(),
gridUncertaintyRestricted(),
gridUncertaintySimulation(),
gridUncertainty()