PROJCS["unnamed",
    GEOGCS["GRS 1980(IUGG, 1980)",
        DATUM["unknown",
            SPHEROID["GRS80",6378137,298.257222101]],
        PRIMEM["Greenwich",0],
        UNIT["degree",0.0174532925199433]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",37.75],
    PARAMETER["central_meridian",-122.45],
    PARAMETER["scale_factor",1.000007],
    PARAMETER["false_easting",48000],
    PARAMETER["false_northing",24000],
    UNIT["Meter",1],
    AUTHORITY["epsg","7131"]]