quadtree (version 0.1.14)

as_raster: Create a raster from a Quadtree

Description

Creates a SpatRaster from a Quadtree.

Usage

# S4 method for Quadtree
as_raster(x, rast = NULL)

Value

a SpatRaster

Arguments

x

a Quadtree

rast

a SpatRaster or RasterLayer; optional; this will be used as a template - the output raster will have the same extent and dimensions as this raster. If NULL (the default), a raster is automatically created, where the quadtree extent is used as the raster extent, and the size of smallest cell in the quadtree is used as the resolution of the raster.

Details

Note that the value of a raster cell is determined by the value of the quadtree cell located at the centroid of the raster cell - thus, if a raster cell overlaps several quadtree cells, whichever quadtree cell the centroid of the raster cell falls in will determine the raster cell's value. If no value is provided for the rast parameter, the raster's dimensions are automatically determined from the quadtree in such a way that the cells are guaranteed to line up with the quadtree cells with no overlap, thus avoiding the issue.

Examples

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

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

rst1 <- as_raster(qt) # use the default raster
rst2 <- as_raster(qt, habitat) # use another raster as a template

old_par <- par(mfrow = c(2, 2))
plot(habitat, main = "original raster")
plot(qt, main = "quadtree")
plot(rst1, main = "raster from quadtree")
plot(rst2, main = "raster from quadtree")
par(old_par)