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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)
A vector of filenames, or "" when there is no filename, if nlyr and bands are both FALSE. Otherwise a data.frame
SpatRaster, SpatRasterCollection, SpatVector or SpatVectorProxy
logical. If TRUE for each source, the number of layers is returned
logical. If TRUE for each source, the "bands" used, that is, the layer number in the source file, are returned
logical. If TRUE a value is returned for each layer instead of for each source
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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