Get the extent of a Quadtree — extent • quadtree

Gets the extent of the Quadtree as an Extent object (from the raster package).

# S4 method for Quadtree
extent(x, original = FALSE)

Arguments

x: a Quadtree
original: boolean; if FALSE (the default), it returns the total extent covered by the quadtree. If TRUE, the function returns the extent of the original raster used to create the quadtree, before the dimensions were adjusted by padding with NAs and/or the raster was resampled.

Value

an Extent object

Examples

library(quadtree)
habitat <- terra::rast(system.file("extdata", "habitat.tif", package="quadtree"))

# create a quadtree
qt <- quadtree(habitat, split_threshold = .1, adj_type = "expand")

# retrieve the extent and the original extent
ext <- extent(qt)
ext_orig <- extent(qt, original = TRUE)

ext
#> SpatExtent : 0, 64000, 0, 64000 (xmin, xmax, ymin, ymax)
ext_orig
#> SpatExtent : 0, 40250, 0, 44500 (xmin, xmax, ymin, ymax)

# plot them
plot(qt)
rect(ext[1], ext[3], ext[2], ext[4], border = "blue", lwd = 4)
rect(ext_orig[1], ext_orig[3], ext_orig[2], ext_orig[4],
     border = "red", lwd = 4)