global: global statistics

Description Usage Arguments Value See Also Examples

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", or "sum".

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

Usage

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

Arguments

x

SpatRaster

fun

function to be applied to summarize the values by zone. Either as one of these character values: "max", "min", "mean", "sum", "range", "rms" (root mean square), "sd", "sdpop" (population sd, using n rather than n-1); or, for relatively small SpatRasters, a proper function

...

additional arguments passed on to fun

weights

NULL or SpatRaster

Value

A data.frame with a row for each layer

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

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

terra documentation built on Aug. 20, 2021, 9:07 a.m.