cover: Replace NA values with values of other layers
Description
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 mutliple layers, the subsequent Raster objects should have the same number of layers, or have a single layer only (which will be recycled).
Arguments
Value
A RasterLayer or RasterBrick object, and in some cases the side effect of a new file on disk.