Change values in a file — update • terra

Change the contents of a file that is the data source of a SpatRaster. BE CAREFUL as you are overwriting values in an existing file.

Usage

# S4 method for SpatRaster
update(object, names=FALSE, crs=FALSE, extent=FALSE)

Arguments

object: SpatRaster
names: logical. Should the names be updated?
crs: logical. Should the coordinate reference system be updated?
extent: logical. Should the extent be updated?

Value

SpatRaster (invisibly)

Examples

s <- rast(system.file("ex/logo.tif", package="terra"))   
fname <- paste0(tempfile(), ".tif")
x <- writeRaster(s, fname)
names(x) <- c("A", "B", "C")
ext(x) <- ext(x) + 1
crs(x) <- "+proj=utm +zone=1"

update(x, names=TRUE, crs=TRUE, extent=TRUE)

rast(fname)
#> class       : SpatRaster 
#> dimensions  : 77, 101, 3  (nrow, ncol, nlyr)
#> resolution  : 1.019802, 1.025974  (x, y)
#> extent      : -1, 102, -1, 78  (xmin, xmax, ymin, ymax)
#> coord. ref. : WGS 84 / UTM zone 1N (EPSG:32601) 
#> source      : file66793188d38a.tif 
#> colors RGB  : 1, 2, 3 
#> names       : red, green, blue 
#> min values  :   0,     0,    0 
#> max values  : 255,   255,  255