EPSG:6684 — JGD2011 / Japan Plane Rectangular CS XVI

PROJCRS[
    "JGD2011 / Japan Plane Rectangular CS XVI",
    BASEGEOGCRS[
        "JGD2011",
        DATUM[
            "Japanese Geodetic Datum 2011",
            ELLIPSOID[
                "GRS 1980",
                6378137,
                298.257222101,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",7019]
            ],
            ID["EPSG",1128]
        ],
        ID["EPSG",6668]
    ],
    CONVERSION[
        "Japan Plane Rectangular CS zone XVI",
        METHOD["Transverse Mercator",ID["EPSG",9807]],
        PARAMETER[
            "Latitude of natural origin",
            26,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8801]
        ],
        PARAMETER[
            "Longitude of natural origin",
            124,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8802]
        ],
        PARAMETER[
            "Scale factor at natural origin",
            0.9999,
            SCALEUNIT["unity",1,ID["EPSG",9201]],
            ID["EPSG",8805]
        ],
        PARAMETER[
            "False easting",
            0,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8806]
        ],
        PARAMETER[
            "False northing",
            0,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8807]
        ],
        ID["EPSG",17816]
    ],
    CS[Cartesian,2,ID["EPSG",4530]],
    AXIS["Northing (X)",north],
    AXIS["Easting (Y)",east],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",6684]
]

+proj=tmerc +lat_0=26 +lon_0=124 +k=0.9999 +x_0=0 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs

proj4.defs("EPSG:6684", "+proj=tmerc +lat_0=26 +lon_0=124 +k=0.9999 +x_0=0 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs");

{
  "type": "CoordinateReferenceSystem",
  "code": 6684,
  "name": "JGD2011 / Japan Plane Rectangular CS XVI",
  "kind": "projected",
  "area": "Japan - zone XVI",
  "unit": "metre",
  "bbox": [
    23.98,
    122.83,
    24.94,
    125.51
  ],
  "proj4": "+proj=tmerc +lat_0=26 +lon_0=124 +k=0.9999 +x_0=0 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs"
}

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (6684, 'EPSG', 6684, '+proj=tmerc +lat_0=26 +lon_0=124 +k=0.9999 +x_0=0 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs', 'PROJCS["JGD2011 / Japan Plane Rectangular CS XVI",GEOGCS["JGD2011",DATUM["Japanese_Geodetic_Datum_2011",SPHEROID["GRS 1980",6378137,298.257222101],TOWGS84[0,0,0,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","6668"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",26],PARAMETER["central_meridian",124],PARAMETER["scale_factor",0.9999],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","6684"]]');

PROJECTION
  "+proj=tmerc"
  "+lat_0=26"
  "+lon_0=124"
  "+k=0.9999"
  "+x_0=0"
  "+y_0=0"
  "+ellps=GRS80"
  "+towgs84=0,0,0,0,0,0,0"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

6684=PROJCS["JGD2011 / Japan Plane Rectangular CS XVI",GEOGCS["JGD2011",DATUM["Japanese_Geodetic_Datum_2011",SPHEROID["GRS 1980",6378137,298.257222101],TOWGS84[0,0,0,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","6668"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",26],PARAMETER["central_meridian",124],PARAMETER["scale_factor",0.9999],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","6684"]]