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
Additional arguments as for writeRaster
Distances for longlat data are computed on the WGS84 spheroid using GeographicLib (Karney, 2013)
C.F.F. Karney, 2013. Algorithms for geodesics, J. Geodesy 87: 43-55. tools:::Rd_expr_doi("10.1007/s00190-012-0578-z").