terra (version 1.7-29)

global: global statistics

Description

Compute global statistics, that is summarized values of an entire SpatRaster.

If x is very large global will fail, except when fun is one of "mean", "min", "max", "sum", "prod", "range" (min and max), "rms" (root mean square), "sd" (sample standard deviation), "std" (population standard deviation), "isNA" (number of cells that are NA), "notNA" (number of cells that are not NA).

You can compute a weighted mean or sum by providing a SpatRaster with weights.

Usage

# S4 method for SpatRaster
global(x, fun="mean", weights=NULL, ...)

Value

A data.frame with a row for each layer

Arguments

x

SpatRaster

fun

function to be applied to summarize the values by zone. Either as one or more of these character values: "max", "min", "mean", "sum", "range", "rms" (root mean square), "sd", "std" (population sd, using n rather than n-1), "isNA", "notNA"; or a proper R function (but these may fail for very large SpatRasters)

...

additional arguments passed on to fun

weights

NULL or SpatRaster

See Also

zonal for "zonal" statistics, and app or Summary-methods for "local" statistics, and extract for summarizing values for polygons. Also see focal for "focal" or "moving window" operations.

Examples

r <- rast(ncols=10, nrows=10)
values(r) <- 1:ncell(r)
global(r, "sum")
global(r, "mean", na.rm=TRUE)
x <- c(r, r/10)
global(x, c("sum", "mean", "sd"), na.rm=TRUE)

global(x, function(i) min(i) / max(i))