delta.grid: Delta of Diversity Metrics

In phyloraster: Evolutionary Diversity Metrics for Raster Data

Delta of Diversity Metrics

Description

Calculates the difference of rasterized diversity metrics (richness, phylogenetic endemism, phylogenetic diversity, weighted endemism, evolutionary distinctiveness) between time periods.

Usage

delta.grid(r1, r2, filename = NULL, cores = 1, ...)

Arguments

r1	SpatRaster. Rasterized diversity metrics for time 1 (e.g phylogenetic diversity in present). To calculate some diversity metrics for rasters see phyloraster::geo.phylo function.
r2	SpatRaster. Rasterized diversity metrics for time 2 (e.g phylogenetic diversity in future).
filename	character. Output filename.
cores	positive integer. If cores > 1, a 'parallel' package cluster with that many cores is created and used.
...	additional arguments to be passed passed down from a calling function.

Details

The two input rasters (r1 and r2) must have the same extent and resolution.

Value

SpatRaster

Examples

# data
x <- terra::rast(system.file("extdata", "rast.presab.tif",
package="phyloraster"))
tree <- ape::read.tree(system.file("extdata", "tree.nex",
package="phyloraster"))

# metric SR richness
riq.pres <- rast.sr(x)
# imagine we lost some species in the future
riq.fut <- rast.sr(x[[c(1:15)]])
dg <- delta.grid(riq.pres, riq.fut)
terra::plot(dg)

phyloraster documentation built on April 3, 2025, 8:45 p.m.