terra: sapp – R documentation

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sapp

Apply a terra function that takes only a single layer to all layers

Description

Apply to all layers of a SpatRaster a function that only takes a single layer SpatRaster (these are rare). in most cases you can also use lapply or sapply for this.

Usage

## S4 method for signature 'SpatRaster'
sapp(x, fun, ..., filename="", overwrite=FALSE, wopt=list())

Arguments

`x`	SpatRaster
`fun`	a function that takes a SpatRaster argument and can be applied to each layer of `x`
`...`	additional arguments to be passed to `fun`
`filename`	character. Output filename
`overwrite`	logical. If `TRUE`, `filename` is overwritten
`wopt`	list with named options for writing files as in `writeRaster`

Value

SpatRaster

Examples

s <- rast(system.file("ex/logo.tif", package="terra")) + 1  
x <- sapp(s, terrain)

terra

Spatial Data Analysis

v1.2-10

GPL (>= 3)

Authors

Robert J. Hijmans [cre, aut] (<https://orcid.org/0000-0001-5872-2872>), Roger Bivand [ctb] (<https://orcid.org/0000-0003-2392-6140>), Karl Forner [ctb], Jeroen Ooms [ctb] (<https://orcid.org/0000-0002-4035-0289>), Edzer Pebesma [ctb] (<https://orcid.org/0000-0001-8049-7069>)

Initial release

2021-05-12