EPSG:21781

CH1903 / LV03 -- Swiss CH1903 / LV03

Available transformations
to EPSG:4150

Selected transformation

Method: NTv2

Grid Files: CHENyx06a.gsb

Remarks: For improved accuracy (0.01m) use CHENyx06 interpolation programme FINELTRA. File CHENyx06 replaced by CHENyx06a; there is a small area at the border of the data where some more real data has been introduced. swisstopo consider the change insignificant.

Information source: Bundesamt für Landestopografie swisstopo; www.swisstopo.ch

Revision date: 2015-12-30

Attributes

Unit: metre

Geodetic CRS: CH1903

Datum: CH1903

Ellipsoid: Bessel 1841

Prime meridian: Greenwich

Data source: EPSG

Information source: Bundesamt für Landestopografie swisstopo; www.swisstopo.ch

Revision date: 2015-11-25

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

Remarks: Replaces LV03C (CRS code 21780) in Switzerland, but used only occasionally in Liechtenstein. Replaced by CH1903+ / LV95 (CRS code 2056).

Area of use: Liechtenstein; Switzerland.

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

Center coordinates
660012.99 185172.18

Projected bounds:
485072.08 74261.66
837118.86 299941.98

WGS84 bounds:
5.96 45.82
10.49 47.81

Liechtenstein; Switzerland.
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Definition: OGC Well Known Text 2 (2019)

BOUNDCRS[
    SOURCECRS[
        PROJCRS["CH1903 / LV03",
            BASEGEOGCRS["CH1903",
                DATUM["CH1903",
                    ELLIPSOID["Bessel 1841",6377397.155,299.1528128,
                        LENGTHUNIT["metre",1]]],
                PRIMEM["Greenwich",0,
                    ANGLEUNIT["degree",0.0174532925199433]],
                ID["EPSG",4149]],
            CONVERSION["Swiss Oblique Mercator 1903M",
                METHOD["Hotine Oblique Mercator (variant B)",
                    ID["EPSG",9815]],
                PARAMETER["Latitude of projection centre",46.9524055555556,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8811]],
                PARAMETER["Longitude of projection centre",7.43958333333333,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8812]],
                PARAMETER["Azimuth of initial line",90,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8813]],
                PARAMETER["Angle from Rectified to Skew Grid",90,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8814]],
                PARAMETER["Scale factor on initial line",1,
                    SCALEUNIT["unity",1],
                    ID["EPSG",8815]],
                PARAMETER["Easting at projection centre",600000,
                    LENGTHUNIT["metre",1],
                    ID["EPSG",8816]],
                PARAMETER["Northing at projection centre",200000,
                    LENGTHUNIT["metre",1],
                    ID["EPSG",8817]]],
            CS[Cartesian,2],
                AXIS["easting (Y)",east,
                    ORDER[1],
                    LENGTHUNIT["metre",1]],
                AXIS["northing (X)",north,
                    ORDER[2],
                    LENGTHUNIT["metre",1]],
            USAGE[
                SCOPE["Cadastre, engineering survey, topographic mapping (large and medium scale)."],
                AREA["Liechtenstein; Switzerland."],
                BBOX[45.82,5.96,47.81,10.49]],
            ID["EPSG",21781]]],
    TARGETCRS[
        GEOGCRS["CH1903+",
            DATUM["CH1903+",
                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["Liechtenstein; Switzerland."],
                BBOX[45.82,5.96,47.81,10.49]],
            ID["EPSG",4150]]],
    ABRIDGEDTRANSFORMATION["CH1903 to CH1903+ (1)",
        METHOD["NTv2",
            ID["EPSG",9615]],
        PARAMETERFILE["Latitude and longitude difference file","CHENyx06a.gsb"],
        USAGE[
            SCOPE["Approximation using NTv2 method of results of FINELTRA programme to an accuracy of 0.01m except at boundary of the Geneva and Vaud cantons, in city of Geneva and in the main valleys of Valais canton where differences are up to 20 cm."],
            AREA["Liechtenstein; Switzerland."],
            BBOX[45.82,5.96,47.81,10.49]],
        ID["EPSG",15486],
        REMARK["For improved accuracy (0.01m) use CHENyx06 interpolation programme FINELTRA. File CHENyx06 replaced by CHENyx06a; there is a small area at the border of the data where some more real data has been introduced. swisstopo consider the change insignificant."]]]

Definition: PROJ.4

+proj=somerc +lat_0=46.9524055555556 +lon_0=7.43958333333333 +k_0=1 +x_0=600000 +y_0=200000 +ellps=bessel +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js)

proj4.defs("EPSG:21781","+proj=somerc +lat_0=46.9524055555556 +lon_0=7.43958333333333 +k_0=1 +x_0=600000 +y_0=200000 +ellps=bessel +units=m +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "BoundCRS",
    "source_crs": {
        "type": "ProjectedCRS",
        "name": "CH1903 / LV03",
        "base_crs": {
            "name": "CH1903",
            "datum": {
                "type": "GeodeticReferenceFrame",
                "name": "CH1903",
                "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": 4149
            }
        },
        "conversion": {
            "name": "Swiss Oblique Mercator 1903M",
            "method": {
                "name": "Hotine Oblique Mercator (variant B)",
                "id": {
                    "authority": "EPSG",
                    "code": 9815
                }
            },
            "parameters": [
                {
                    "name": "Latitude of projection centre",
                    "value": 46.9524055555556,
                    "unit": "degree",
                    "id": {
                        "authority": "EPSG",
                        "code": 8811
                    }
                },
                {
                    "name": "Longitude of projection centre",
                    "value": 7.43958333333333,
                    "unit": "degree",
                    "id": {
                        "authority": "EPSG",
                        "code": 8812
                    }
                },
                {
                    "name": "Azimuth of initial line",
                    "value": 90,
                    "unit": "degree",
                    "id": {
                        "authority": "EPSG",
                        "code": 8813
                    }
                },
                {
                    "name": "Angle from Rectified to Skew Grid",
                    "value": 90,
                    "unit": "degree",
                    "id": {
                        "authority": "EPSG",
                        "code": 8814
                    }
                },
                {
                    "name": "Scale factor on initial line",
                    "value": 1,
                    "unit": "unity",
                    "id": {
                        "authority": "EPSG",
                        "code": 8815
                    }
                },
                {
                    "name": "Easting at projection centre",
                    "value": 600000,
                    "unit": "metre",
                    "id": {
                        "authority": "EPSG",
                        "code": 8816
                    }
                },
                {
                    "name": "Northing at projection centre",
                    "value": 200000,
                    "unit": "metre",
                    "id": {
                        "authority": "EPSG",
                        "code": 8817
                    }
                }
            ]
        },
        "coordinate_system": {
            "subtype": "Cartesian",
            "axis": [
                {
                    "name": "Easting",
                    "abbreviation": "Y",
                    "direction": "east",
                    "unit": "metre"
                },
                {
                    "name": "Northing",
                    "abbreviation": "X",
                    "direction": "north",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 21781
        }
    },
    "target_crs": {
        "type": "GeographicCRS",
        "name": "CH1903+",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "CH1903+",
            "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": 4150
        }
    },
    "transformation": {
        "name": "CH1903 to CH1903+ (1)",
        "method": {
            "name": "NTv2",
            "id": {
                "authority": "EPSG",
                "code": 9615
            }
        },
        "parameters": [
            {
                "name": "Latitude and longitude difference file",
                "value": "CHENyx06a.gsb",
                "id": {
                    "authority": "EPSG",
                    "code": 8656
                }
            }
        ],
        "id": {
            "authority": "EPSG",
            "code": 15486
        }
    }
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=somerc"
	"lat_0=46.9524055555556"
	"lon_0=7.43958333333333"
	"k_0=1"
	"x_0=600000"
	"y_0=200000"
	"ellps=bessel"
	"units=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=somerc +lat_0=46.9524055555556 +lon_0=7.43958333333333 +k_0=1 +x_0=600000 +y_0=200000 +ellps=bessel +units=m +no_defs +type=crs">
	<Layer srs="+proj=somerc +lat_0=46.9524055555556 +lon_0=7.43958333333333 +k_0=1 +x_0=600000 +y_0=200000 +ellps=bessel +units=m +no_defs +type=crs">
	</Layer>
</Map>