The function calculates the distance from a set of points to all cells of a Raster* object.
The distance unit is in meters if the coordinate reference system (crs) of the Raster* object is (+proj=longlat) or assumed to be if the crs is NA. In all other cases it is in the units defined by the crs (which typically is meters).
distanceFromPoints(object, xy, filename='', ...)
matrix of x and y coordinates, or a SpatialPoints* object.
character. Optional filename for the output RasterLayer