Simple features in R (7)

Returning the CRS (coordinate reference system):

nc_crs <- st_crs(nc)

From ?st_crs:

the $ method for crs objects retrieves named elements using the GDAL interface; named elements include "SemiMajor", "SemiMinor", "InvFlattening", "IsGeographic", "units_gdal", "IsVertical", "WktPretty", "Wkt", "Name", "proj4string", "epsg", "yx", "ud_unit", and "axes" (this may be subject to changes in future GDAL versions).