Sister Islands National Grid 1961

Cayman Islands - Little Cayman and Cayman Brac. , accuracy 1.0 m, code 6143 (default) [7]
Cayman Islands - Little Cayman and Cayman Brac. , accuracy 1.0 m, code 15829 [3]
Cayman Islands - Little Cayman and Cayman Brac. , accuracy 44.0 m, code 15814 [3]

Selected transformation

Method: Coordinate Frame rotation (geog2D domain)

Remarks: Parameter values are taken from SIGD59 to CIGD11 (1) (code 6137) assuming that CIGD11 and WGS 84 can be considered the same to within the accuracy of the transformation.

Information source: OGP

Revision date: 2021-09-23

Attributes

Unit: foot

Geodetic CRS: SIGD61

Datum: Sister Islands Geodetic Datum 1961

Ellipsoid: Clarke 1866

Prime meridian: Greenwich

Data source: EPSG

Information source: Lands and Surveys Department, Cayman Islands Government.

Revision date: 2013-01-29

Scope: Cadastre, engineering survey, topographic mapping.

Area of use: Cayman Islands - Little Cayman and Cayman Brac.

Coordinate system: Cartesian 2D CS. Axes: easting, northing (E,N). Orientations: east, north. UoM: ft.

Covered area powered by MapTiler

Center coordinates
2013704.63 7149258.03

Projected bounds:
1936194.31 7121582.66
2091290.95 7177039.29

WGS84 bounds:
-80.14 19.63
-79.69 19.78

Cayman Islands - Little Cayman and Cayman Brac.

Definition: OGC Well Known Text

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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"]]

Definition: OGC Well Known Text 2 (2019)

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PROJCRS["Sister Islands National Grid 1961",
    BASEGEOGCRS["SIGD61",
        DATUM["Sister Islands Geodetic Datum 1961",
            ELLIPSOID["Clarke 1866",6378206.4,294.978698213898,
                LENGTHUNIT["metre",1]]],
        PRIMEM["Greenwich",0,
            ANGLEUNIT["degree",0.0174532925199433]],
        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",8801]],
        PARAMETER["Longitude of natural origin",-81,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8802]],
        PARAMETER["Scale factor at natural origin",0.9996,
            SCALEUNIT["unity",1],
            ID["EPSG",8805]],
        PARAMETER["False easting",1640419.9475,
            LENGTHUNIT["foot",0.3048],
            ID["EPSG",8806]],
        PARAMETER["False northing",0,
            LENGTHUNIT["foot",0.3048],
            ID["EPSG",8807]]],
    CS[Cartesian,2],
        AXIS["(E)",east,
            ORDER[1],
            LENGTHUNIT["foot",0.3048]],
        AXIS["(N)",north,
            ORDER[2],
            LENGTHUNIT["foot",0.3048]],
    USAGE[
        SCOPE["Cadastre, engineering survey, topographic mapping."],
        AREA["Cayman Islands - Little Cayman and Cayman Brac."],
        BBOX[19.63,-80.14,19.78,-79.69]],
    ID["EPSG",6129]]

Definition: ESRI Well Known Text

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PROJCS["Sister_Islands_National_Grid_1961",
    GEOGCS["GCS_Little_Cayman_1961",
        DATUM["D_Little_Cayman_1961",
            SPHEROID["Clarke_1866",6378206.4,294.978698213898]],
        PRIMEM["Greenwich",0.0],
        UNIT["Degree",0.0174532925199433]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["False_Easting",1640419.9475],
    PARAMETER["False_Northing",0.0],
    PARAMETER["Central_Meridian",-81.0],
    PARAMETER["Scale_Factor",0.9996],
    PARAMETER["Latitude_Of_Origin",0.0],
    UNIT["foot",0.3048]]

Definition: 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

Definition: JavaScript (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");

Definition: JSON

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{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "ProjectedCRS",
    "name": "Sister Islands National Grid 1961",
    "base_crs": {
        "name": "SIGD61",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Sister Islands Geodetic Datum 1961",
            "ellipsoid": {
                "name": "Clarke 1866",
                "semi_major_axis": 6378206.4,
                "inverse_flattening": 294.978698213898
            }
        },
        "coordinate_system": {
            "subtype": "ellipsoidal",
            "axis": [
                {
                    "name": "Geodetic latitude",
                    "abbreviation": "Lat",
                    "direction": "north",
                    "unit": "degree"
                },
                {
                    "name": "Geodetic longitude",
                    "abbreviation": "Lon",
                    "direction": "east",
                    "unit": "degree"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 4726
        }
    },
    "conversion": {
        "name": "Cayman Islands TM (ft)",
        "method": {
            "name": "Transverse Mercator",
            "id": {
                "authority": "EPSG",
                "code": 9807
            }
        },
        "parameters": [
            {
                "name": "Latitude of natural origin",
                "value": 0,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8801
                }
            },
            {
                "name": "Longitude of natural origin",
                "value": -81,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8802
                }
            },
            {
                "name": "Scale factor at natural origin",
                "value": 0.9996,
                "unit": "unity",
                "id": {
                    "authority": "EPSG",
                    "code": 8805
                }
            },
            {
                "name": "False easting",
                "value": 1640419.9475,
                "unit": {
                    "type": "LinearUnit",
                    "name": "foot",
                    "conversion_factor": 0.3048
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8806
                }
            },
            {
                "name": "False northing",
                "value": 0,
                "unit": {
                    "type": "LinearUnit",
                    "name": "foot",
                    "conversion_factor": 0.3048
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8807
                }
            }
        ]
    },
    "coordinate_system": {
        "subtype": "Cartesian",
        "axis": [
            {
                "name": "Easting",
                "abbreviation": "E",
                "direction": "east",
                "unit": {
                    "type": "LinearUnit",
                    "name": "foot",
                    "conversion_factor": 0.3048
                }
            },
            {
                "name": "Northing",
                "abbreviation": "N",
                "direction": "north",
                "unit": {
                    "type": "LinearUnit",
                    "name": "foot",
                    "conversion_factor": 0.3048
                }
            }
        ]
    },
    "scope": "Cadastre, engineering survey, topographic mapping.",
    "area": "Cayman Islands - Little Cayman and Cayman Brac.",
    "bbox": {
        "south_latitude": 19.63,
        "west_longitude": -80.14,
        "north_latitude": 19.78,
        "east_longitude": -79.69
    },
    "id": {
        "authority": "EPSG",
        "code": 6129
    }
}

Definition: 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"]]

Definition: MapServer - MAPfile

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

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+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">
	<Layer srs="+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">
	</Layer>
</Map>

Definition: SQL (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"]]');

EPSG:6129