COMPD_CS["SVY21 + SHD height",
    GEOGCS["SVY21",
        DATUM["SVY21",
            SPHEROID["WGS 84",6378137,298.257223563,
                AUTHORITY["EPSG","7030"]],
            AUTHORITY["EPSG","6757"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4757"]],
    VERT_CS["SHD height",
        VERT_DATUM["Singapore Height Datum",2005,
            AUTHORITY["EPSG","1140"]],
        UNIT["metre",1,
            AUTHORITY["EPSG","9001"]],
        AXIS["Gravity-related height",UP],
        AUTHORITY["EPSG","6916"]],
    AUTHORITY["EPSG","6917"]]