GEOGCS["GCS_Unknown_datum_based_upon_the_WGS_84_ellipsoid",DATUM["D_Not_specified_based_on_WGS_84_ellipsoid",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]