Set the NA flag

The main purpose of this method is to allow correct reading of a SpatRaster that is based on a file that has an incorrect or missing NA flag. The file is not changed, but the flagged value is set to NA when values are read from the file. In contrast, if the cell values are in memory the change is made immediately.

To change cell values, you can use classify

Usage

# S4 method for class 'SpatRaster'
NAflag(x)

# S4 method for class 'SpatRaster'
NAflag(x) <- value

Arguments

x

SpatRaster

value

numeric. The value to be interpreted as NA; set this before reading the values from the file. This can be a single value, or multiple values, one for each data source (file / subdataset)

Value

none or numeric

See also

classify

Examples

s <- rast(system.file("ex/logo.tif", package="terra"))[[1]]   
NAflag(s) <- 255
plot(s)

NAflag(s)
#> [1] 255