focal_bylayer: Apply raster's focal function by layer
In sustainablefarms/linking-data: OBSOLETE: Linking Data Project R Package

Apply's raster's focal function to layers in a brick or stack. See help for focal for more information on paramater behaviour.

focal_bylayer(
  x,
  w,
  fun,
  na.rm = FALSE,
  pad = FALSE,
  padValue = NA,
  NAonly = FALSE,
  cl = NULL,
  ...
)

`x`	A RasterBrick or RasterStack
`w`	Focal weights as required by `focal`
`fun`	Function to apply to value in focal region
`na.rm`	If TRUE NA values removed from computations.
`pad`	Passed to `raster::focal()`. If TRUE, additional 'virtual' rows and columns are padded to x such that there are no edge effects. This can be useful when a function needs to have access to the central cell of the filter.
`padValue`	Passed to `raster::focal()`. The value of the cells of the padded rows and columns.
`NAonly`	Passed to `raster::focal()`. If TRUE, only cell values that are NA are replaced with the computed focal values.
`cl`	a cluster for parallel computation created par parallel. If NULL then no parallel computations will occur.