Data sources of a SpatRaster — sources • terra

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.

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

# S4 method for SpatVector
sources(x)

# S4 method for SpatRaster
hasValues(x)

# S4 method for 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)
#> [1] "/Users/runner/work/_temp/Library/terra/ex/elev.tif"
#> [2] "/Users/runner/work/_temp/Library/terra/ex/elev.tif"
#> [3] ""                                                  
#> [4] "/Users/runner/work/_temp/Library/terra/ex/elev.tif"
hasValues(r)
#> [1] TRUE
x <- rast()
hasValues(x)
#> [1] FALSE