sources {terra}

R Documentation

Data sources of a SpatRaster

Description

Get the data sources of a SpatRaster or SpatVector or related object. Sources are either files (or similar resources) or "", meaning that they are in memory. You can use hasValues to check if in-memory layers actually have cell values.

Usage

## S4 method for signature 'SpatRaster'
sources(x, nlyr=FALSE, bands=FALSE)

## S4 method for signature 'SpatVector'
sources(x)

## S4 method for signature 'SpatRaster'
hasValues(x)

## S4 method for signature 'SpatRaster'
inMemory(x, bylayer=FALSE)

Arguments

x	SpatRaster, SpatRasterCollection, SpatVector or SpatVectorProxy
nlyr	logical. If TRUE for each source, the number of layers is returned
bands	logical. If TRUE for each source, the "bands" used, that is, the layer number in the source file, are returned
bylayer	logical. If TRUE a value is returned for each layer instead of for each source

Value

A vector of filenames, or "" when there is no filename, if nlyr and bands are both FALSE. Otherwise a data.frame

Examples

f <- system.file("ex/elev.tif", package="terra")
r <- rast(f)
s <- rast(r)
values(s) <- 1:ncell(s)
rs <- c(r,r,s,r)
sources(rs)
hasValues(r)
x <- rast()
hasValues(x)

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