EPSG:4406

NAD27 / BLM 6N (ftUS)

Available transformations
to EPSG:4326

Selected transformation

Grid Files: NTv2_0.gsb

Remarks:

Information source: Various oil industry sources.

Revision date: 2020-03-14

Attributes

Unit: US survey foot

Geodetic CRS: NAD27

Datum: North American Datum 1927

Ellipsoid: Clarke 1866

Prime meridian: Greenwich

Data source: EPSG

Information source: OGP

Revision date: 2011-06-30

Center coordinates
16632121.17 33122855.39

Projected bounds:
11129288.75 28231174.35
22787235.5 38278856.53

WGS84 bounds:
-67.75 40.0
-43.99 64.21

Canada - offshore Newfoundland and Labrador, New Brunswick and Nova Scotia - west of 44°W and north of 40°N.
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Definition: OGC Well Known Text 2 (2019)

BOUNDCRS[
    SOURCECRS[
        BOUNDCRS[
            SOURCECRS[
                BOUNDCRS[
                    SOURCECRS[
                        PROJCRS["NAD27 / BLM 6N (ftUS)",
                            BASEGEOGCRS["NAD27",
                                DATUM["North American Datum 1927",
                                    ELLIPSOID["Clarke 1866",6378206.4,294.978698213898,
                                        LENGTHUNIT["metre",1]]],
                                PRIMEM["Greenwich",0,
                                    ANGLEUNIT["degree",0.0174532925199433]],
                                ID["EPSG",4267]],
                            CONVERSION["BLM zone 6N (US survey feet)",
                                METHOD["Transverse Mercator",
                                    ID["EPSG",9807]],
                                PARAMETER["Latitude of natural origin",0,
                                    ANGLEUNIT["degree",0.0174532925199433],
                                    ID["EPSG",8801]],
                                PARAMETER["Longitude of natural origin",-147,
                                    ANGLEUNIT["degree",0.0174532925199433],
                                    ID["EPSG",8802]],
                                PARAMETER["Scale factor at natural origin",0.9996,
                                    SCALEUNIT["unity",1],
                                    ID["EPSG",8805]],
                                PARAMETER["False easting",1640416.67,
                                    LENGTHUNIT["US survey foot",0.304800609601219],
                                    ID["EPSG",8806]],
                                PARAMETER["False northing",0,
                                    LENGTHUNIT["US survey foot",0.304800609601219],
                                    ID["EPSG",8807]]],
                            CS[Cartesian,2],
                                AXIS["easting (X)",east,
                                    ORDER[1],
                                    LENGTHUNIT["US survey foot",0.304800609601219]],
                                AXIS["northing (Y)",north,
                                    ORDER[2],
                                    LENGTHUNIT["US survey foot",0.304800609601219]],
                            ID["EPSG",4406]]],
                    TARGETCRS[
                        GEOGCRS["NAD83",
                            DATUM["North American Datum 1983",
                                ELLIPSOID["GRS 1980",6378137,298.257222101,
                                    LENGTHUNIT["metre",1]]],
                            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]],
                            ID["EPSG",4269]]],
                    ABRIDGEDTRANSFORMATION["NAD27 to NAD83 (4)",
                        METHOD["NTv2",
                            ID["EPSG",9615]],
                        PARAMETERFILE["Latitude and longitude difference file","NTv2_0.gsb"],
                        ID["EPSG",1313]]]],
            TARGETCRS[
                GEOGCRS["NAD83(CSRS)",
                    DATUM["NAD83 Canadian Spatial Reference System",
                        ELLIPSOID["GRS 1980",6378137,298.257222101,
                            LENGTHUNIT["metre",1]]],
                    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]],
                    ID["EPSG",4617]]],
            ABRIDGEDTRANSFORMATION["NAD83 to NAD83(CSRS) (4)",
                METHOD["Geocentric translations (geog2D domain)",
                    ID["EPSG",9603]],
                PARAMETER["X-axis translation",0,
                    ID["EPSG",8605]],
                PARAMETER["Y-axis translation",0,
                    ID["EPSG",8606]],
                PARAMETER["Z-axis translation",0,
                    ID["EPSG",8607]],
                ID["EPSG",1950]]]],
    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["NAD83(CSRS) to WGS 84 (2)",
        METHOD["Coordinate Frame rotation (geog2D domain)",
            ID["EPSG",9607]],
        PARAMETER["X-axis translation",-0.991,
            ID["EPSG",8605]],
        PARAMETER["Y-axis translation",1.9072,
            ID["EPSG",8606]],
        PARAMETER["Z-axis translation",0.5129,
            ID["EPSG",8607]],
        PARAMETER["X-axis rotation",-0.0257899075194932,
            ID["EPSG",8608]],
        PARAMETER["Y-axis rotation",-0.0096500989602704,
            ID["EPSG",8609]],
        PARAMETER["Z-axis rotation",-0.0116599432323421,
            ID["EPSG",8610]],
        PARAMETER["Scale difference",1,
            ID["EPSG",8611]],
        USAGE[
            SCOPE["Approximation for medium and low accuracy applications ignoring static/dynamic CRS differences."],
            AREA["Canada - onshore and offshore - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon."],
            BBOX[38.21,-141.01,86.46,-40.73]],
        ID["EPSG",1946],
        REMARK["Approximation derived from tfm code 6864 ignoring time-dependent parameters and assuming ITRF96(1997.0) and WGS 84 can be considered the same within the accuracy of the transformation."]]]

Definition: PROJ.4

+proj=tmerc +lat_0=0 +lon_0=-147 +k=0.9996 +x_0=500000.001016002 +y_0=0 +ellps=clrk66 +towgs84=-0.991,1.9072,0.5129,0.0257899075194932,0.0096500989602704,0.0116599432323421,0 +units=us-ft +no_defs +type=crs

Definition: JavaScript (Proj4js)

proj4.defs("EPSG:4406","+proj=tmerc +lat_0=0 +lon_0=-147 +k=0.9996 +x_0=500000.001016002 +y_0=0 +ellps=clrk66 +towgs84=-0.991,1.9072,0.5129,0.0257899075194932,0.0096500989602704,0.0116599432323421,0 +units=us-ft +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.5/projjson.schema.json",
    "type": "BoundCRS",
    "source_crs": {
        "type": "BoundCRS",
        "source_crs": {
            "type": "BoundCRS",
            "source_crs": {
                "type": "ProjectedCRS",
                "name": "NAD27 / BLM 6N (ftUS)",
                "base_crs": {
                    "name": "NAD27",
                    "datum": {
                        "type": "GeodeticReferenceFrame",
                        "name": "North American Datum 1927",
                        "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": 4267
                    }
                },
                "conversion": {
                    "name": "BLM zone 6N (US survey feet)",
                    "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": -147,
                            "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": 1640416.67,
                            "unit": {
                                "type": "LinearUnit",
                                "name": "US survey foot",
                                "conversion_factor": 0.304800609601219
                            },
                            "id": {
                                "authority": "EPSG",
                                "code": 8806
                            }
                        },
                        {
                            "name": "False northing",
                            "value": 0,
                            "unit": {
                                "type": "LinearUnit",
                                "name": "US survey foot",
                                "conversion_factor": 0.304800609601219
                            },
                            "id": {
                                "authority": "EPSG",
                                "code": 8807
                            }
                        }
                    ]
                },
                "coordinate_system": {
                    "subtype": "Cartesian",
                    "axis": [
                        {
                            "name": "Easting",
                            "abbreviation": "X",
                            "direction": "east",
                            "unit": {
                                "type": "LinearUnit",
                                "name": "US survey foot",
                                "conversion_factor": 0.304800609601219
                            }
                        },
                        {
                            "name": "Northing",
                            "abbreviation": "Y",
                            "direction": "north",
                            "unit": {
                                "type": "LinearUnit",
                                "name": "US survey foot",
                                "conversion_factor": 0.304800609601219
                            }
                        }
                    ]
                },
                "id": {
                    "authority": "EPSG",
                    "code": 4406
                }
            },
            "target_crs": {
                "type": "GeographicCRS",
                "name": "NAD83",
                "datum": {
                    "type": "GeodeticReferenceFrame",
                    "name": "North American Datum 1983",
                    "ellipsoid": {
                        "name": "GRS 1980",
                        "semi_major_axis": 6378137,
                        "inverse_flattening": 298.257222101
                    }
                },
                "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": 4269
                }
            },
            "transformation": {
                "name": "NAD27 to NAD83 (4)",
                "method": {
                    "name": "NTv2",
                    "id": {
                        "authority": "EPSG",
                        "code": 9615
                    }
                },
                "parameters": [
                    {
                        "name": "Latitude and longitude difference file",
                        "value": "NTv2_0.gsb",
                        "id": {
                            "authority": "EPSG",
                            "code": 8656
                        }
                    }
                ],
                "id": {
                    "authority": "EPSG",
                    "code": 1313
                }
            }
        },
        "target_crs": {
            "type": "GeographicCRS",
            "name": "NAD83(CSRS)",
            "datum": {
                "type": "GeodeticReferenceFrame",
                "name": "NAD83 Canadian Spatial Reference System",
                "ellipsoid": {
                    "name": "GRS 1980",
                    "semi_major_axis": 6378137,
                    "inverse_flattening": 298.257222101
                }
            },
            "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": 4617
            }
        },
        "transformation": {
            "name": "NAD83 to NAD83(CSRS) (4)",
            "method": {
                "name": "Geocentric translations (geog2D domain)",
                "id": {
                    "authority": "EPSG",
                    "code": 9603
                }
            },
            "parameters": [
                {
                    "name": "X-axis translation",
                    "value": 0,
                    "unit": "metre",
                    "id": {
                        "authority": "EPSG",
                        "code": 8605
                    }
                },
                {
                    "name": "Y-axis translation",
                    "value": 0,
                    "unit": "metre",
                    "id": {
                        "authority": "EPSG",
                        "code": 8606
                    }
                },
                {
                    "name": "Z-axis translation",
                    "value": 0,
                    "unit": "metre",
                    "id": {
                        "authority": "EPSG",
                        "code": 8607
                    }
                }
            ],
            "id": {
                "authority": "EPSG",
                "code": 1950
            }
        }
    },
    "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": "NAD83(CSRS) to WGS 84 (2)",
        "method": {
            "name": "Coordinate Frame rotation (geog2D domain)",
            "id": {
                "authority": "EPSG",
                "code": 9607
            }
        },
        "parameters": [
            {
                "name": "X-axis translation",
                "value": -0.991,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8605
                }
            },
            {
                "name": "Y-axis translation",
                "value": 1.9072,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8606
                }
            },
            {
                "name": "Z-axis translation",
                "value": 0.5129,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8607
                }
            },
            {
                "name": "X-axis rotation",
                "value": -1.25033e-07,
                "unit": {
                    "type": "AngularUnit",
                    "name": "radian",
                    "conversion_factor": 1
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8608
                }
            },
            {
                "name": "Y-axis rotation",
                "value": -4.6785e-08,
                "unit": {
                    "type": "AngularUnit",
                    "name": "radian",
                    "conversion_factor": 1
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8609
                }
            },
            {
                "name": "Z-axis rotation",
                "value": -5.6529e-08,
                "unit": {
                    "type": "AngularUnit",
                    "name": "radian",
                    "conversion_factor": 1
                },
                "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
                }
            }
        ],
        "id": {
            "authority": "EPSG",
            "code": 1946
        }
    }
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=tmerc"
	"lat_0=0"
	"lon_0=-147"
	"k=0.9996"
	"x_0=500000.001016002"
	"y_0=0"
	"ellps=clrk66"
	"towgs84=-0.991,1.9072,0.5129,0.0257899075194932,0.0096500989602704,0.0116599432323421,0"
	"units=us-ft"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=tmerc +lat_0=0 +lon_0=-147 +k=0.9996 +x_0=500000.001016002 +y_0=0 +ellps=clrk66 +towgs84=-0.991,1.9072,0.5129,0.0257899075194932,0.0096500989602704,0.0116599432323421,0 +units=us-ft +no_defs +type=crs">
	<Layer srs="+proj=tmerc +lat_0=0 +lon_0=-147 +k=0.9996 +x_0=500000.001016002 +y_0=0 +ellps=clrk66 +towgs84=-0.991,1.9072,0.5129,0.0257899075194932,0.0096500989602704,0.0116599432323421,0 +units=us-ft +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 4406, 'EPSG', 4406, '+proj=tmerc +lat_0=0 +lon_0=-147 +k=0.9996 +x_0=500000.001016002 +y_0=0 +ellps=clrk66 +towgs84=-0.991,1.9072,0.5129,0.0257899075194932,0.0096500989602704,0.0116599432323421,0 +units=us-ft +no_defs +type=crs', 'None');