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Create a binary mask from a raster by thresholding

Source: R/fl_mask.R
fl_mask.Rd

Applies a comparison operator and threshold to a raster, returning a binary (0/1) mask. Useful for slope masks, elevation masks, depth masks, etc.

Usage

fl_mask(x, threshold, operator = "<=")

Arguments

x

A SpatRaster with numeric values.

threshold

Numeric scalar. The threshold value.

operator

Character. One of "<=", "<", ">=", ">", "==", "!=". Default "<=".

Value

A SpatRaster with values 1 (condition met) and 0 (condition not met). NA cells in x remain NA.

Examples

slope <- terra::rast(system.file("testdata/slope.tif", package = "flooded"))
gentle <- fl_mask(slope, threshold = 9, operator = "<=")
terra::plot(gentle, col = c("grey90", "darkgreen"), main = "Slope <= 9%")