EPSG:6129 — Sister Islands National Grid 1961

Projected · Cayman Islands - Little Cayman and Cayman Brac

Export Formats

OGC WKT

PROJCS[
    "Sister Islands National Grid 1961",
    GEOGCS[
        "SIGD61",
        DATUM[
            "Sister_Islands_Geodetic_Datum_1961",
            SPHEROID["Clarke 1866",6378206.4,294.978698213898],
            TOWGS84[8.853,-52.644,180.304,0.393,2.323,-2.96,-24.081]
        ],
        PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4726"]
    ],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",0],
    PARAMETER["central_meridian",-81],
    PARAMETER["scale_factor",0.9996],
    PARAMETER["false_easting",1640419.9475],
    PARAMETER["false_northing",0],
    UNIT["foot",0.3048],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","6129"]
]

WKT2

PROJCRS[
    "Sister Islands National Grid 1961",
    BASEGEOGCRS[
        "SIGD61",
        DATUM[
            "Sister Islands Geodetic Datum 1961",
            ELLIPSOID[
                "Clarke 1866",
                6378206.4,
                294.978698213898,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",7008]
            ],
            ID["EPSG",6726]
        ],
        ID["EPSG",4726]
    ],
    CONVERSION[
        "Cayman Islands TM (ft)",
        METHOD["Transverse Mercator",ID["EPSG",9807]],
        PARAMETER[
            "Latitude of natural origin",
            0,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8801]
        ],
        PARAMETER[
            "Longitude of natural origin",
            -81,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8802]
        ],
        PARAMETER[
            "Scale factor at natural origin",
            0.9996,
            SCALEUNIT["unity",1,ID["EPSG",9201]],
            ID["EPSG",8805]
        ],
        PARAMETER[
            "False easting",
            1640419.9475,
            LENGTHUNIT["foot",0.3048,ID["EPSG",9002]],
            ID["EPSG",8806]
        ],
        PARAMETER[
            "False northing",
            0,
            LENGTHUNIT["foot",0.3048,ID["EPSG",9002]],
            ID["EPSG",8807]
        ],
        ID["EPSG",6127]
    ],
    CS[Cartesian,2,ID["EPSG",1039]],
    AXIS["Easting (E)",east],
    AXIS["Northing (N)",north],
    LENGTHUNIT["foot",0.3048,ID["EPSG",9002]],
    ID["EPSG",6129]
]

PROJ.4

+proj=tmerc +lat_0=0 +lon_0=-81 +k=0.9996 +x_0=499999.999998 +y_0=0 +ellps=clrk66 +towgs84=8.853,-52.644,180.304,0.393,2.323,-2.96,-24.081 +units=ft +no_defs +type=crs

Proj4js

How to add a projection to Proj4js? →

proj4.defs("EPSG:6129", "+proj=tmerc +lat_0=0 +lon_0=-81 +k=0.9996 +x_0=499999.999998 +y_0=0 +ellps=clrk66 +towgs84=8.853,-52.644,180.304,0.393,2.323,-2.96,-24.081 +units=ft +no_defs +type=crs");

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 6129,
  "name": "Sister Islands National Grid 1961",
  "kind": "projected",
  "area": "Cayman Islands - Little Cayman and Cayman Brac",
  "unit": "foot",
  "bbox": [
    19.63,
    -80.14,
    19.78,
    -79.69
  ],
  "proj4": "+proj=tmerc +lat_0=0 +lon_0=-81 +k=0.9996 +x_0=499999.999998 +y_0=0 +ellps=clrk66 +towgs84=8.853,-52.644,180.304,0.393,2.323,-2.96,-24.081 +units=ft +no_defs +type=crs"
}

PostGIS

How to add a projection to PostGIS? →

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (6129, 'EPSG', 6129, '+proj=tmerc +lat_0=0 +lon_0=-81 +k=0.9996 +x_0=499999.999998 +y_0=0 +ellps=clrk66 +towgs84=8.853,-52.644,180.304,0.393,2.323,-2.96,-24.081 +units=ft +no_defs +type=crs', 'PROJCS["Sister Islands National Grid 1961",GEOGCS["SIGD61",DATUM["Sister_Islands_Geodetic_Datum_1961",SPHEROID["Clarke 1866",6378206.4,294.978698213898],TOWGS84[8.853,-52.644,180.304,0.393,2.323,-2.96,-24.081]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4726"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-81],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",1640419.9475],PARAMETER["false_northing",0],UNIT["foot",0.3048],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","6129"]]');

MapServer

How to add a projection to MapServer? →

PROJECTION
  "+proj=tmerc"
  "+lat_0=0"
  "+lon_0=-81"
  "+k=0.9996"
  "+x_0=499999.999998"
  "+y_0=0"
  "+ellps=clrk66"
  "+towgs84=8.853,-52.644,180.304,0.393,2.323,-2.96,-24.081"
  "+units=ft"
  "+no_defs"
  "+type=crs"
END

GeoServer

How to add a projection to GeoServer? →

6129=PROJCS["Sister Islands National Grid 1961",GEOGCS["SIGD61",DATUM["Sister_Islands_Geodetic_Datum_1961",SPHEROID["Clarke 1866",6378206.4,294.978698213898],TOWGS84[8.853,-52.644,180.304,0.393,2.323,-2.96,-24.081]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4726"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-81],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",1640419.9475],PARAMETER["false_northing",0],UNIT["foot",0.3048],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","6129"]]

Related Coordinate Systems

Available Transformations (4)

Transformations inherited from base CRS: EPSG:4726 (SIGD61)

Transformation	Source → Target	Accuracy (m)
SIGD61 to CIGD11 (1)	4726 → 6135	0.15
SIGD61 to WGS 84 (3)	4726 → 4326	1
SIGD61 to WGS 84 (2)	4726 → 4326	1
SIGD61 to WGS 84 (1)	4726 → 4326	44

Other CRS using Sister Islands Geodetic Datum 1961

Frequently Asked Questions

How do I add EPSG:6129 to GeoServer?

Add the following definition to your GeoServer configuration:

6129=PROJCS["Sister Islands National Grid 1961",GEOGCS["SIGD61",DATUM["Sister_Islands_Geodetic_Datum_1961",SPHEROID["Clarke 1866",6378206.4,294.978698213898],TOWGS84[8.853,-52.644,180.304,0.393,2.323,-2.96,-24.081]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4726"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-81],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",1640419.9475],PARAMETER["false_northing",0],UNIT["foot",0.3048],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","6129"]]

Read the full GeoServer guide →

How do I add EPSG:6129 to PostGIS?

Add the following definition to your PostGIS configuration:

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (6129, 'EPSG', 6129, '+proj=tmerc +lat_0=0 +lon_0=-81 +k=0.9996 +x_0=499999.999998 +y_0=0 +ellps=clrk66 +towgs84=8.853,-52.644,180.304,0.393,2.323,-2.96,-24.081 +units=ft +no_defs +type=crs', 'PROJCS["Sister Islands National Grid 1961",GEOGCS["SIGD61",DATUM["Sister_Islands_Geodetic_Datum_1961",SPHEROID["Clarke 1866",6378206.4,294.978698213898],TOWGS84[8.853,-52.644,180.304,0.393,2.323,-2.96,-24.081]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4726"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-81],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",1640419.9475],PARAMETER["false_northing",0],UNIT["foot",0.3048],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","6129"]]');

Read the full PostGIS guide →

How do I add EPSG:6129 to MapServer?

Add the following definition to your MapServer configuration:

PROJECTION
  "+proj=tmerc"
  "+lat_0=0"
  "+lon_0=-81"
  "+k=0.9996"
  "+x_0=499999.999998"
  "+y_0=0"
  "+ellps=clrk66"
  "+towgs84=8.853,-52.644,180.304,0.393,2.323,-2.96,-24.081"
  "+units=ft"
  "+no_defs"
  "+type=crs"
END

Read the full MapServer guide →

How do I use EPSG:6129 with Proj4js?

Add the following definition to your Proj4js configuration:

proj4.defs("EPSG:6129", "+proj=tmerc +lat_0=0 +lon_0=-81 +k=0.9996 +x_0=499999.999998 +y_0=0 +ellps=clrk66 +towgs84=8.853,-52.644,180.304,0.393,2.323,-2.96,-24.081 +units=ft +no_defs +type=crs");

Read the full Proj4js guide →