is.projected(obj)
proj4string(obj)
proj4string(obj) <- value
get_ll_warn()
get_ll_TOL()
set_ll_warn(value)
set_ll_TOL(value)
proj4string
CRS object, containing a valid proj4 string; attempts to assign an object containing "longlat" to data extending beyond longitude [-180, 360] or lattitude [-90, 90] will be stopped. For set_ll_warn
a single logicais.projected
returns a logical; proj4string
returns a character vector of length 1; spatial.dimension
returns the number of spatial dimensions (2 or 3).