EPSG:26720

NAD27 / UTM zone 20N

Available transformations
to EPSG:4152
EPSG:4152 - NAD83(HARN)

Selected transformation

Grid Files: conus.las conus.los lahpgn.las lahpgn.los

Remarks: May be taken as approximate transformation NAD27 to WGS 84 - see code 8603.

Information source: US Coast & Geodetic Survey www.ngs.noaa.gov NADCON readme file

Revision date: 1999-10-20

Attributes

Unit: metre

Geodetic CRS: NAD27

Datum: North American Datum 1927

Ellipsoid: Clarke 1866

Prime meridian: Greenwich

Data source: EPSG

Revision date: 1995-06-02

Scope: Engineering survey, topographic mapping.

Remarks: In Quebec replaced by NAD27(CGQ77) / UTM zone 20N (code 2034).

Area of use: North America - between 66°W and 60°W - onshore and offshore. Canada - New Brunswick; Labrador; Nova Scotia; Nunavut; Prince Edward Island; Quebec. United States (USA) offshore Atlantic.

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

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SimpleMap

Center coordinates
-2264420.42 3794160.13

Projected bounds:
-2607430.49 3481014.74
-1936648.87 4118614.47

WGS84 bounds:
-94.05 28.85
-88.75 33.03

United States (USA) - Louisiana.
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Definition: OGC Well Known Text 2 (2019)

BOUNDCRS[
    SOURCECRS[
        BOUNDCRS[
            SOURCECRS[
                PROJCRS["NAD27 / UTM zone 20N",
                    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["UTM zone 20N",
                        METHOD["Transverse Mercator",
                            ID["EPSG",9807]],
                        PARAMETER["Latitude of natural origin",0,
                            ANGLEUNIT["degree",0.0174532925199433],
                            ID["EPSG",8801]],
                        PARAMETER["Longitude of natural origin",-63,
                            ANGLEUNIT["degree",0.0174532925199433],
                            ID["EPSG",8802]],
                        PARAMETER["Scale factor at natural origin",0.9996,
                            SCALEUNIT["unity",1],
                            ID["EPSG",8805]],
                        PARAMETER["False easting",500000,
                            LENGTHUNIT["metre",1],
                            ID["EPSG",8806]],
                        PARAMETER["False northing",0,
                            LENGTHUNIT["metre",1],
                            ID["EPSG",8807]]],
                    CS[Cartesian,2],
                        AXIS["(E)",east,
                            ORDER[1],
                            LENGTHUNIT["metre",1]],
                        AXIS["(N)",north,
                            ORDER[2],
                            LENGTHUNIT["metre",1]],
                    ID["EPSG",26720]]],
            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 (1)",
                METHOD["NADCON",
                    ID["EPSG",9613]],
                PARAMETERFILE["Latitude difference file","conus.las"],
                PARAMETERFILE["Longitude difference file","conus.los"],
                ID["EPSG",1241]]]],
    TARGETCRS[
        GEOGCRS["NAD83(HARN)",
            DATUM["NAD83 (High Accuracy Reference Network)",
                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]],
            USAGE[
                SCOPE["Horizontal component of 3D system."],
                AREA["American Samoa - onshore - Tutuila, Aunu'u, Ofu, Olesega, Ta'u and Rose islands. Guam - onshore. Northern Mariana Islands - onshore. Puerto Rico - onshore. United States (USA) - onshore Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin and Wyoming; offshore Gulf of Mexico continental shelf (GoM OCS). US Virgin Islands - onshore."],
                BBOX[-14.59,144.58,71.4,-64.51]],
            ID["EPSG",4152]]],
    ABRIDGEDTRANSFORMATION["NAD83 to NAD83(HARN) (11)",
        METHOD["NADCON",
            ID["EPSG",9613]],
        PARAMETERFILE["Latitude difference file","lahpgn.las"],
        PARAMETERFILE["Longitude difference file","lahpgn.los"],
        USAGE[
            SCOPE["Geodesy."],
            AREA["United States (USA) - Louisiana."],
            BBOX[28.85,-94.05,33.03,-88.75]],
        ID["EPSG",1484],
        REMARK["Accuracy 67% confidence level. Uses NADCON method which expects longitudes positive west; EPSG GeogCRSs NAD83 (code 4269) and NAD83(HARN) (code 4152) have longitudes positive east. May be taken as approximate transformation NAD83-WGS 84 - see code 1719."]]]

Definition: PROJ.4

+proj=utm +zone=20 +datum=NAD27 +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:26720","+proj=utm +zone=20 +datum=NAD27 +units=m +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "BoundCRS",
    "source_crs": {
        "type": "BoundCRS",
        "source_crs": {
            "type": "ProjectedCRS",
            "name": "NAD27 / UTM zone 20N",
            "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": "UTM zone 20N",
                "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": -63,
                        "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": 500000,
                        "unit": "metre",
                        "id": {
                            "authority": "EPSG",
                            "code": 8806
                        }
                    },
                    {
                        "name": "False northing",
                        "value": 0,
                        "unit": "metre",
                        "id": {
                            "authority": "EPSG",
                            "code": 8807
                        }
                    }
                ]
            },
            "coordinate_system": {
                "subtype": "Cartesian",
                "axis": [
                    {
                        "name": "Easting",
                        "abbreviation": "E",
                        "direction": "east",
                        "unit": "metre"
                    },
                    {
                        "name": "Northing",
                        "abbreviation": "N",
                        "direction": "north",
                        "unit": "metre"
                    }
                ]
            },
            "id": {
                "authority": "EPSG",
                "code": 26720
            }
        },
        "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 (1)",
            "method": {
                "name": "NADCON",
                "id": {
                    "authority": "EPSG",
                    "code": 9613
                }
            },
            "parameters": [
                {
                    "name": "Latitude difference file",
                    "value": "conus.las",
                    "id": {
                        "authority": "EPSG",
                        "code": 8657
                    }
                },
                {
                    "name": "Longitude difference file",
                    "value": "conus.los",
                    "id": {
                        "authority": "EPSG",
                        "code": 8658
                    }
                }
            ],
            "id": {
                "authority": "EPSG",
                "code": 1241
            }
        }
    },
    "target_crs": {
        "type": "GeographicCRS",
        "name": "NAD83(HARN)",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "NAD83 (High Accuracy Reference Network)",
            "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": 4152
        }
    },
    "transformation": {
        "name": "NAD83 to NAD83(HARN) (11)",
        "source_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
            }
        },
        "method": {
            "name": "NADCON",
            "id": {
                "authority": "EPSG",
                "code": 9613
            }
        },
        "parameters": [
            {
                "name": "Latitude difference file",
                "value": "lahpgn.las",
                "id": {
                    "authority": "EPSG",
                    "code": 8657
                }
            },
            {
                "name": "Longitude difference file",
                "value": "lahpgn.los",
                "id": {
                    "authority": "EPSG",
                    "code": 8658
                }
            }
        ],
        "id": {
            "authority": "EPSG",
            "code": 1484
        }
    }
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=utm"
	"zone=20"
	"datum=NAD27"
	"units=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=utm +zone=20 +datum=NAD27 +units=m +no_defs +type=crs">
	<Layer srs="+proj=utm +zone=20 +datum=NAD27 +units=m +no_defs +type=crs">
	</Layer>
</Map>