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Method: Geocentric translations (geog2D domain)
Remarks: Determined from 1 satellite station. Accuracy +/- 25m in each axis.
Information source: DMA / NIMA / NGA TR8350.2 (3rd edition, Amendment 1, 3 January 2000)
Revision date: 2020-03-14
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.
&stroke=red&width=2&path=19.63,-80.14|19.78,-80.14|19.78,-79.69|19.63,-79.69|19.63,-80.14)
Center coordinates
2013289.8 7149092.91
Projected bounds:
1935781.97 7121419.45
2090873.63 7176872.25
WGS84 bounds:
-80.14 19.63
-79.69 19.78
Definition: OGC Well Known Text
PROJCS["Sister Islands National Grid 1961", GEOGCS["SIGD61", DATUM["Sister_Islands_Geodetic_Datum_1961", SPHEROID["Clarke 1866",6378206.4,294.978698213898], TOWGS84[42,124,147,0,0,0,0]], 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)
BOUNDCRS[ SOURCECRS[ 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]]], TARGETCRS[ GEOGCRS["WGS 84", ENSEMBLE["World Geodetic System 1984 ensemble", MEMBER["World Geodetic System 1984 (Transit)"], MEMBER["World Geodetic System 1984 (G730)"], MEMBER["World Geodetic System 1984 (G873)"], MEMBER["World Geodetic System 1984 (G1150)"], MEMBER["World Geodetic System 1984 (G1674)"], MEMBER["World Geodetic System 1984 (G1762)"], MEMBER["World Geodetic System 1984 (G2139)"], ELLIPSOID["WGS 84",6378137,298.257223563, LENGTHUNIT["metre",1]], ENSEMBLEACCURACY[2.0]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], CS[ellipsoidal,2], AXIS["geodetic latitude (Lat)",north, ORDER[1], ANGLEUNIT["degree",0.0174532925199433]], AXIS["geodetic longitude (Lon)",east, ORDER[2], ANGLEUNIT["degree",0.0174532925199433]], USAGE[ SCOPE["Horizontal component of 3D system."], AREA["World."], BBOX[-90,-180,90,180]], ID["EPSG",4326]]], ABRIDGEDTRANSFORMATION["Transformation from unknown to WGS84", METHOD["Position Vector transformation (geog2D domain)", ID["EPSG",9606]], PARAMETER["X-axis translation",42, ID["EPSG",8605]], PARAMETER["Y-axis translation",124, ID["EPSG",8606]], PARAMETER["Z-axis translation",147, ID["EPSG",8607]], PARAMETER["X-axis rotation",0, ID["EPSG",8608]], PARAMETER["Y-axis rotation",0, ID["EPSG",8609]], PARAMETER["Z-axis rotation",0, ID["EPSG",8610]], PARAMETER["Scale difference",1, ID["EPSG",8611]]]]
Definition: ESRI Well Known Text
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: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "BoundCRS", "source_crs": { "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, "semi_minor_axis": 6356583.8 } }, "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 } } ] }, "id": { "authority": "EPSG", "code": 6129 } }, "target_crs": { "type": "GeographicCRS", "name": "WGS 84", "datum_ensemble": { "name": "World Geodetic System 1984 ensemble", "members": [ { "name": "World Geodetic System 1984 (Transit)", "id": { "authority": "EPSG", "code": 1166 } }, { "name": "World Geodetic System 1984 (G730)", "id": { "authority": "EPSG", "code": 1152 } }, { "name": "World Geodetic System 1984 (G873)", "id": { "authority": "EPSG", "code": 1153 } }, { "name": "World Geodetic System 1984 (G1150)", "id": { "authority": "EPSG", "code": 1154 } }, { "name": "World Geodetic System 1984 (G1674)", "id": { "authority": "EPSG", "code": 1155 } }, { "name": "World Geodetic System 1984 (G1762)", "id": { "authority": "EPSG", "code": 1156 } }, { "name": "World Geodetic System 1984 (G2139)", "id": { "authority": "EPSG", "code": 1309 } } ], "ellipsoid": { "name": "WGS 84", "semi_major_axis": 6378137, "inverse_flattening": 298.257223563 }, "accuracy": "2.0", "id": { "authority": "EPSG", "code": 6326 } }, "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": 4326 } }, "transformation": { "name": "Transformation from unknown to WGS84", "method": { "name": "Position Vector transformation (geog2D domain)", "id": { "authority": "EPSG", "code": 9606 } }, "parameters": [ { "name": "X-axis translation", "value": 42, "unit": "metre", "id": { "authority": "EPSG", "code": 8605 } }, { "name": "Y-axis translation", "value": 124, "unit": "metre", "id": { "authority": "EPSG", "code": 8606 } }, { "name": "Z-axis translation", "value": 147, "unit": "metre", "id": { "authority": "EPSG", "code": 8607 } }, { "name": "X-axis rotation", "value": 0, "unit": { "type": "AngularUnit", "name": "arc-second", "conversion_factor": 4.84813681109536e-06 }, "id": { "authority": "EPSG", "code": 8608 } }, { "name": "Y-axis rotation", "value": 0, "unit": { "type": "AngularUnit", "name": "arc-second", "conversion_factor": 4.84813681109536e-06 }, "id": { "authority": "EPSG", "code": 8609 } }, { "name": "Z-axis rotation", "value": 0, "unit": { "type": "AngularUnit", "name": "arc-second", "conversion_factor": 4.84813681109536e-06 }, "id": { "authority": "EPSG", "code": 8610 } }, { "name": "Scale difference", "value": 0, "unit": { "type": "ScaleUnit", "name": "parts per million", "conversion_factor": 1e-06 }, "id": { "authority": "EPSG", "code": 8611 } } ] } }
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[42,124,147,0,0,0,0]],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: 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=42,124,147,0,0,0,0 +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=42,124,147,0,0,0,0 +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=42,124,147,0,0,0,0 +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[42,124,147,0,0,0,0]],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"]]');
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