EPSG:3875

ETRS89 / GK21FIN

Attributes

Unit: metre

Geodetic CRS: ETRS89

Datum: European Terrestrial Reference System 1989 ensemble

Data source: EPSG

Information source: National Land Survey of Finland; http://www.maanmittauslaitos.fi

Revision date: 2020-03-30

Scope: Cadastre, engineering survey, topographic mapping (large scale).

Remarks: Replaces ETRS89 / ETRS-GK21FIN (CRS code 3128). (For medium scale mapping and country-wide work use ETRS89 / TM35FIN(N,E), code 5048).

Area of use: Finland - nominally onshore between 20°30'E and 21°30'E but may be used in adjacent areas if a municipality chooses to use one zone over its whole extent.

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

Center coordinates
21404251.22 5393745.08

Projected bounds:
21187966.41 5288406.87
21617021.34 5505788.73

WGS84 bounds:
16.84 47.73
22.56 49.61

Slovakia.
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Definition: OGC Well Known Text 2 (2019)

BOUNDCRS[
    SOURCECRS[
        BOUNDCRS[
            SOURCECRS[
                PROJCRS["ETRS89 / GK21FIN",
                    BASEGEOGCRS["ETRS89",
                        ENSEMBLE["European Terrestrial Reference System 1989 ensemble",
                            MEMBER["European Terrestrial Reference Frame 1989"],
                            MEMBER["European Terrestrial Reference Frame 1990"],
                            MEMBER["European Terrestrial Reference Frame 1991"],
                            MEMBER["European Terrestrial Reference Frame 1992"],
                            MEMBER["European Terrestrial Reference Frame 1993"],
                            MEMBER["European Terrestrial Reference Frame 1994"],
                            MEMBER["European Terrestrial Reference Frame 1996"],
                            MEMBER["European Terrestrial Reference Frame 1997"],
                            MEMBER["European Terrestrial Reference Frame 2000"],
                            MEMBER["European Terrestrial Reference Frame 2005"],
                            MEMBER["European Terrestrial Reference Frame 2014"],
                            ELLIPSOID["GRS 1980",6378137,298.257222101,
                                LENGTHUNIT["metre",1]],
                            ENSEMBLEACCURACY[0.1]],
                        PRIMEM["Greenwich",0,
                            ANGLEUNIT["degree",0.0174532925199433]],
                        ID["EPSG",4258]],
                    CONVERSION["Finland Gauss-Kruger zone 21",
                        METHOD["Transverse Mercator",
                            ID["EPSG",9807]],
                        PARAMETER["Latitude of natural origin",0,
                            ANGLEUNIT["degree",0.0174532925199433],
                            ID["EPSG",8801]],
                        PARAMETER["Longitude of natural origin",21,
                            ANGLEUNIT["degree",0.0174532925199433],
                            ID["EPSG",8802]],
                        PARAMETER["Scale factor at natural origin",1,
                            SCALEUNIT["unity",1],
                            ID["EPSG",8805]],
                        PARAMETER["False easting",21500000,
                            LENGTHUNIT["metre",1],
                            ID["EPSG",8806]],
                        PARAMETER["False northing",0,
                            LENGTHUNIT["metre",1],
                            ID["EPSG",8807]]],
                    CS[Cartesian,2],
                        AXIS["northing (N)",north,
                            ORDER[1],
                            LENGTHUNIT["metre",1]],
                        AXIS["easting (E)",east,
                            ORDER[2],
                            LENGTHUNIT["metre",1]],
                    ID["EPSG",3875]]],
            TARGETCRS[
                GEOGCRS["S-JTSK [JTSK03]",
                    DATUM["System of the Unified Trigonometrical Cadastral Network [JTSK03]",
                        ELLIPSOID["Bessel 1841",6377397.155,299.1528128,
                            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",8351]]],
            ABRIDGEDTRANSFORMATION["ETRS89 to S-JTSK [JTSK03] (1)",
                METHOD["Coordinate Frame rotation (geog2D domain)",
                    ID["EPSG",9607]],
                PARAMETER["X-axis translation",-485.014055,
                    ID["EPSG",8605]],
                PARAMETER["Y-axis translation",-169.473618,
                    ID["EPSG",8606]],
                PARAMETER["Z-axis translation",-483.842943,
                    ID["EPSG",8607]],
                PARAMETER["X-axis rotation",7.78625453,
                    ID["EPSG",8608]],
                PARAMETER["Y-axis rotation",4.39770887,
                    ID["EPSG",8609]],
                PARAMETER["Z-axis rotation",4.10248899,
                    ID["EPSG",8610]],
                PARAMETER["Scale difference",1,
                    ID["EPSG",8611]],
                ID["EPSG",8365]]]],
    TARGETCRS[
        GEOGCRS["S-JTSK",
            DATUM["System of the Unified Trigonometrical Cadastral Network",
                ELLIPSOID["Bessel 1841",6377397.155,299.1528128,
                    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["Geodesy."],
                AREA["Czechia; Slovakia."],
                BBOX[47.73,12.09,51.06,22.56]],
            ID["EPSG",4156]]],
    ABRIDGEDTRANSFORMATION["S-JTSK [JTSK03] to S-JTSK (1)",
        METHOD["NADCON",
            ID["EPSG",9613]],
        PARAMETERFILE["Latitude difference file","Slovakia_JTSK03_to_JTSK.LAS"],
        PARAMETERFILE["Longitude difference file","Slovakia_JTSK03_to_JTSK.LOS"],
        USAGE[
            SCOPE["Transformation of coordinates at 0.05m level of accuracy."],
            AREA["Slovakia."],
            BBOX[47.73,16.84,49.61,22.56]],
        ID["EPSG",8364],
        REMARK["Derived at 684 identical points. Also available as an NTv2 file."]]]

Definition: PROJ.4

+proj=tmerc +lat_0=0 +lon_0=21 +k=1 +x_0=21500000 +y_0=0 +ellps=GRS80 +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js)

proj4.defs("EPSG:3875","+proj=tmerc +lat_0=0 +lon_0=21 +k=1 +x_0=21500000 +y_0=0 +ellps=GRS80 +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": "ETRS89 / GK21FIN",
            "base_crs": {
                "name": "ETRS89",
                "datum_ensemble": {
                    "name": "European Terrestrial Reference System 1989 ensemble",
                    "members": [
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                            "name": "European Terrestrial Reference Frame 1989",
                            "id": {
                                "authority": "EPSG",
                                "code": 1178
                            }
                        },
                        {
                            "name": "European Terrestrial Reference Frame 1990",
                            "id": {
                                "authority": "EPSG",
                                "code": 1179
                            }
                        },
                        {
                            "name": "European Terrestrial Reference Frame 1991",
                            "id": {
                                "authority": "EPSG",
                                "code": 1180
                            }
                        },
                        {
                            "name": "European Terrestrial Reference Frame 1992",
                            "id": {
                                "authority": "EPSG",
                                "code": 1181
                            }
                        },
                        {
                            "name": "European Terrestrial Reference Frame 1993",
                            "id": {
                                "authority": "EPSG",
                                "code": 1182
                            }
                        },
                        {
                            "name": "European Terrestrial Reference Frame 1994",
                            "id": {
                                "authority": "EPSG",
                                "code": 1183
                            }
                        },
                        {
                            "name": "European Terrestrial Reference Frame 1996",
                            "id": {
                                "authority": "EPSG",
                                "code": 1184
                            }
                        },
                        {
                            "name": "European Terrestrial Reference Frame 1997",
                            "id": {
                                "authority": "EPSG",
                                "code": 1185
                            }
                        },
                        {
                            "name": "European Terrestrial Reference Frame 2000",
                            "id": {
                                "authority": "EPSG",
                                "code": 1186
                            }
                        },
                        {
                            "name": "European Terrestrial Reference Frame 2005",
                            "id": {
                                "authority": "EPSG",
                                "code": 1204
                            }
                        },
                        {
                            "name": "European Terrestrial Reference Frame 2014",
                            "id": {
                                "authority": "EPSG",
                                "code": 1206
                            }
                        }
                    ],
                    "ellipsoid": {
                        "name": "GRS 1980",
                        "semi_major_axis": 6378137,
                        "inverse_flattening": 298.257222101
                    },
                    "accuracy": "0.1",
                    "id": {
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                        "code": 6258
                    }
                },
                "coordinate_system": {
                    "subtype": "ellipsoidal",
                    "axis": [
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                            "name": "Geodetic latitude",
                            "abbreviation": "Lat",
                            "direction": "north",
                            "unit": "degree"
                        },
                        {
                            "name": "Geodetic longitude",
                            "abbreviation": "Lon",
                            "direction": "east",
                            "unit": "degree"
                        }
                    ]
                },
                "id": {
                    "authority": "EPSG",
                    "code": 4258
                }
            },
            "conversion": {
                "name": "Finland Gauss-Kruger zone 21",
                "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": 21,
                        "unit": "degree",
                        "id": {
                            "authority": "EPSG",
                            "code": 8802
                        }
                    },
                    {
                        "name": "Scale factor at natural origin",
                        "value": 1,
                        "unit": "unity",
                        "id": {
                            "authority": "EPSG",
                            "code": 8805
                        }
                    },
                    {
                        "name": "False easting",
                        "value": 21500000,
                        "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": "Northing",
                        "abbreviation": "N",
                        "direction": "north",
                        "unit": "metre"
                    },
                    {
                        "name": "Easting",
                        "abbreviation": "E",
                        "direction": "east",
                        "unit": "metre"
                    }
                ]
            },
            "id": {
                "authority": "EPSG",
                "code": 3875
            }
        },
        "target_crs": {
            "type": "GeographicCRS",
            "name": "S-JTSK [JTSK03]",
            "datum": {
                "type": "GeodeticReferenceFrame",
                "name": "System of the Unified Trigonometrical Cadastral Network [JTSK03]",
                "ellipsoid": {
                    "name": "Bessel 1841",
                    "semi_major_axis": 6377397.155,
                    "inverse_flattening": 299.1528128
                }
            },
            "coordinate_system": {
                "subtype": "ellipsoidal",
                "axis": [
                    {
                        "name": "Geodetic latitude",
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                        "direction": "north",
                        "unit": "degree"
                    },
                    {
                        "name": "Geodetic longitude",
                        "abbreviation": "Lon",
                        "direction": "east",
                        "unit": "degree"
                    }
                ]
            },
            "id": {
                "authority": "EPSG",
                "code": 8351
            }
        },
        "transformation": {
            "name": "ETRS89 to S-JTSK [JTSK03] (1)",
            "method": {
                "name": "Coordinate Frame rotation (geog2D domain)",
                "id": {
                    "authority": "EPSG",
                    "code": 9607
                }
            },
            "parameters": [
                {
                    "name": "X-axis translation",
                    "value": -485.014055,
                    "unit": "metre",
                    "id": {
                        "authority": "EPSG",
                        "code": 8605
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                },
                {
                    "name": "Y-axis translation",
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                    "unit": "metre",
                    "id": {
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                    }
                },
                {
                    "name": "Z-axis translation",
                    "value": -483.842943,
                    "unit": "metre",
                    "id": {
                        "authority": "EPSG",
                        "code": 8607
                    }
                },
                {
                    "name": "X-axis rotation",
                    "value": 7.78625453,
                    "unit": {
                        "type": "AngularUnit",
                        "name": "arc-second",
                        "conversion_factor": 4.84813681109536e-06
                    },
                    "id": {
                        "authority": "EPSG",
                        "code": 8608
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                },
                {
                    "name": "Y-axis rotation",
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                        "name": "arc-second",
                        "conversion_factor": 4.84813681109536e-06
                    },
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                        "code": 8609
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                },
                {
                    "name": "Z-axis rotation",
                    "value": 4.10248899,
                    "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
                    }
                }
            ],
            "id": {
                "authority": "EPSG",
                "code": 8365
            }
        }
    },
    "target_crs": {
        "type": "GeographicCRS",
        "name": "S-JTSK",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "System of the Unified Trigonometrical Cadastral Network",
            "ellipsoid": {
                "name": "Bessel 1841",
                "semi_major_axis": 6377397.155,
                "inverse_flattening": 299.1528128
            }
        },
        "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": 4156
        }
    },
    "transformation": {
        "name": "S-JTSK [JTSK03] to S-JTSK (1)",
        "source_crs": {
            "type": "GeographicCRS",
            "name": "S-JTSK [JTSK03]",
            "datum": {
                "type": "GeodeticReferenceFrame",
                "name": "System of the Unified Trigonometrical Cadastral Network [JTSK03]",
                "ellipsoid": {
                    "name": "Bessel 1841",
                    "semi_major_axis": 6377397.155,
                    "inverse_flattening": 299.1528128
                }
            },
            "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": 8351
            }
        },
        "method": {
            "name": "NADCON",
            "id": {
                "authority": "EPSG",
                "code": 9613
            }
        },
        "parameters": [
            {
                "name": "Latitude difference file",
                "value": "Slovakia_JTSK03_to_JTSK.LAS",
                "id": {
                    "authority": "EPSG",
                    "code": 8657
                }
            },
            {
                "name": "Longitude difference file",
                "value": "Slovakia_JTSK03_to_JTSK.LOS",
                "id": {
                    "authority": "EPSG",
                    "code": 8658
                }
            }
        ],
        "id": {
            "authority": "EPSG",
            "code": 8364
        }
    }
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=tmerc"
	"lat_0=0"
	"lon_0=21"
	"k=1"
	"x_0=21500000"
	"y_0=0"
	"ellps=GRS80"
	"units=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=tmerc +lat_0=0 +lon_0=21 +k=1 +x_0=21500000 +y_0=0 +ellps=GRS80 +units=m +no_defs +type=crs">
	<Layer srs="+proj=tmerc +lat_0=0 +lon_0=21 +k=1 +x_0=21500000 +y_0=0 +ellps=GRS80 +units=m +no_defs +type=crs">
	</Layer>
</Map>