Oxy {BoundaryStats}

Average minimum distance between boundary elements of two variables

Description

Statistical test for the average minimum distance between boundary elements in two raster layers. Uses Euclidean distance. Boundaries for each trait affect one another reciprocally (x affects y and y affects x).

Usage

Oxy(x, y, null_distrib)

Arguments

x

A SpatRaster object with boundary elements.

y

A SpatRaster object with boundary elements.

null_distrib

A list of probability functions output from overlap_null_distrib().

Value

p-value

Author(s)

Amy Luo

References

Jacquez, G.M., Maruca,I S. & Fortin, M.-J. (2000) From fields to objects: A review of geographic boundary analysis. Journal of Geographical Systems, 3, 221, 241. Fortin, M.-J., Drapeau, P. & Jacquez, G.M. (1996) Quantification of the Spatial Co-Occurrences of Ecological Boundaries. Oikos, 77, 51-60.

Examples

data(T.cristatus)
T.cristatus <- terra::rast(T.cristatus_matrix, crs = T.cristatus_crs)
terra::ext(T.cristatus) <- T.cristatus_ext

data(grassland)
grassland <- terra::rast(grassland_matrix, crs = grassland_crs)
terra::ext(grassland) <- grassland_ext

Tcrist_ovlp_null <- overlap_null_distrib(T.cristatus, grassland, rand_both = FALSE,
  x_cat = TRUE, n_iterations = 100, x_model = 'random_cluster')
Tcrist_boundaries <- categorical_boundary(T.cristatus)
grassland_boundaries <- define_boundary(grassland, 0.1)

Oxy(Tcrist_boundaries, grassland_boundaries, Tcrist_ovlp_null)