R: Replace values with values from another object

cover {terra} | R Documentation

## Replace values with values from another object

### Description

Replace `NA` or other values in SpatRaster `x` with the values of SpatRaster `y`

For polygons: areas of `x` that overlap with `y` are replaced by `y` or, if `identity=TRUE` intersected with `y`.

### Usage

    ## S4 method for signature 'SpatRaster,SpatRaster'
    cover(x, y, values=NA, filename="", ...)

    ## S4 method for signature 'SpatVector,SpatVector'
    cover(x, y, identity=FALSE)

### Arguments

`x` | SpatRaster or SpatVector
`y` | Same as `x`
`values` | numeric. The cell values in `x` to be replaced by the values in `y`
`filename` | character. Output filename
`...` | additional arguments for writing files as in `writeRaster`
`identity` | logical. If `TRUE` overlapping areas are intersected rather than replaced

### Value

SpatRaster

### Examples

    r1 <- r2 <- rast(ncols=36, nrows=18)
    values(r1) <- 1:ncell(r1)
    values(r2) <- runif(ncell(r2))
    r2 <- classify(r2, cbind(-Inf, 0.5, NA))
    r3 <- cover(r2, r1)

    p <- vect(system.file("ex/lux.shp", package="terra"))
    e <- as.polygons(ext(6, 6.4, 49.75, 50))
    values(e) <- data.frame(y=10)
    #cv <- cover(p, e)
    #plot(cv, col=rainbow(12))
    #ci <- cover(p, e, identity=TRUE)
    #lines(e, lwd=3)

    #plot(ci, col=rainbow(12))
    #lines(e, lwd=3)

[Package terra version 1.2-5 Index]