Mask all non-NA cells or all NA cells

This function converts all non-NA cells in a GRaster to a single user-defined value, leaving NA cells as NA. Alternatively, it can convert NA cells to a user-defined value, and all non-NA cells to NA.

Usage

# S4 method for class 'GRaster'
maskNA(x, value = 1, invert = FALSE, retain = FALSE)

Arguments

x

A GRaster.

value

Numeric: Value to which to assign to masked cells. The default is 1.

invert

Logical: If FALSE (default), convert non-NA cells to value, and leave NA cells as-is. If TRUE, convert all NA cells to value, and non-NA cells to NA.

retain

Logical: If invert is TRUE and retain is FALSE (default), non-NA cells will retain their value. This argument is ignored if invert is FALSE.

See also

not.na(), app(), mask()

Examples

if (grassStarted()) {

# Setup
library(terra)

# Elevation raster
madElev <- fastData("madElev")

# Convert a SpatRaster to a GRaster:
elev <- fast(madElev)

# Convert non-NA to 1, NA cells remain NA
elevMask <- maskNA(elev)
elevMask
plot(c(elev, elevMask))

# Convert NA to 1, non-NA cells become NA
elevInvertMask <- maskNA(elev, invert = TRUE)
elevInvertMask
plot(c(elev, elevInvertMask))

# Convert NA to 200, non-NA cells keep their values
elevInvertRetain <- maskNA(elev, value = 200, invert = TRUE, retain = TRUE)
elevInvertRetain
plot(c(elev, elevInvertRetain))

}