cover: Replace NA values with values of other layers

In raster: Geographic Data Analysis and Modeling

Description

For Raster* objects: Replace NA values in the first Raster object (x) with the values of the second (y), and so forth for additional Rasters. If x has multiple layers, the subsequent Raster objects should have the same number of layers, or have a single layer only (which will be recycled).

For SpatialPolygons* objects: Areas of x that overlap with y are replaced by (or intersected with) y.

Usage

## S4 method for signature 'RasterLayer,RasterLayer'
cover(x, y, ..., filename='')

## S4 method for signature 'RasterStackBrick,Raster'
cover(x, y, ..., filename='')

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

Arguments

x	Raster* or SpatialPolygons* object
y	Same as x
filename	character. Output filename (optional)
...	Same as x. If x is a Raster* object, also additional arguments as for writeRaster
identity	logical. If TRUE overlapping areas are intersected rather than replaced

Value

RasterLayer or RasterBrick object, or SpatialPolygons object

Examples

# raster objects
r1 <- raster(ncols=36, nrows=18)
values(r1) <- 1:ncell(r1)
r2 <- setValues(r1, runif(ncell(r1)))
r2[r2 < 0.5] <- NA
r3 <- cover(r2, r1)


#SpatialPolygons
if (require(rgdal) & require(rgeos)) {
	p <- shapefile(system.file("external/lux.shp", package="raster"))
	b <- as(extent(6, 6.4, 49.75, 50), 'SpatialPolygons')
	crs(b) <- crs(p)
	b <- SpatialPolygonsDataFrame(b, data.frame(ID_1=9))
	
	cv1 <- cover(p, b)
	cv2 <- cover(p, b, identity=TRUE)
}

Example output

Loading required package: sp
Loading required package: rgdal
Loading required package: rgeos
Warning messages:
1: In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE,  :
  there is no package called 'rgdal'
2: In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE,  :
  there is no package called 'rgeos'

raster documentation built on Jan. 5, 2021, 3:01 a.m.