EPSG:8441

Tananarive / Laborde Grid

Transform Get position on a map

Available transformations
to EPSG:4326
No other targets exist for this CRS

Selected transformation

Method: Geocentric translations (geog2D domain)

Remarks: Derived at 9 points throughout Madagascar. Adopted by OMV.

Information source: "Laborde projection in Madagascar cartography and its recovery in WGS84 datum", Marco Roggero. Società Italiana di Fotogrammetria e Topografia (SIFET) 2009 publication Appl Geomat (2009) 1:131–140.

Revision date: 2020-03-14

Attributes

Unit: metre

Geodetic CRS: Tananarive

Datum: Tananarive 1925

Ellipsoid: International 1924

Prime meridian: Greenwich

Data source: EPSG

Information source: Société des Pétroles de Madagascar.

Revision date: 2018-04-19

Scope: Engineering survey, topographic mapping.

Remarks: See Tananarive (Paris) / Laborde Grid (CRS code 29701) for original definition in grads with respect to the Paris meridian. This is equivalent.

Area of use: Madagascar - onshore.

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

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SimpleMap

Center coordinates
436064.89 773558.76

Projected bounds:
-26284.79 -60450.07
901225.99 1597848.35

WGS84 bounds:
42.53 -26.59
51.03 -11.69

Madagascar - onshore and nearshore.
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Definition: OGC Well Known Text

PROJCS["Tananarive / Laborde Grid",
    GEOGCS["Tananarive",
        DATUM["Tananarive_1925",
            SPHEROID["International 1924",6378388,297],
            TOWGS84[-198.383,-240.517,-107.909,0,0,0,0]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4297"]],
    PROJECTION["Laborde_Oblique_Mercator"],
    PARAMETER["latitude_of_center",-18.9],
    PARAMETER["longitude_of_center",46.4372291666667],
    PARAMETER["azimuth",18.9],
    PARAMETER["scale_factor",0.9995],
    PARAMETER["false_easting",400000],
    PARAMETER["false_northing",800000],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AUTHORITY["EPSG","8441"]]

Definition: OGC Well Known Text 2 (2019)

BOUNDCRS[
    SOURCECRS[
        PROJCRS["Tananarive / Laborde Grid",
            BASEGEOGCRS["Tananarive",
                DATUM["Tananarive 1925",
                    ELLIPSOID["International 1924",6378388,297,
                        LENGTHUNIT["metre",1]]],
                PRIMEM["Greenwich",0,
                    ANGLEUNIT["degree",0.0174532925199433]],
                ID["EPSG",4297]],
            CONVERSION["Laborde Grid (Greenwich)",
                METHOD["Laborde Oblique Mercator",
                    ID["EPSG",9813]],
                PARAMETER["Latitude of projection centre",-18.9,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8811]],
                PARAMETER["Longitude of projection centre",46.4372291666667,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8812]],
                PARAMETER["Azimuth of initial line",18.9,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8813]],
                PARAMETER["Scale factor on initial line",0.9995,
                    SCALEUNIT["unity",1],
                    ID["EPSG",8815]],
                PARAMETER["False easting",400000,
                    LENGTHUNIT["metre",1],
                    ID["EPSG",8806]],
                PARAMETER["False northing",800000,
                    LENGTHUNIT["metre",1],
                    ID["EPSG",8807]]],
            CS[Cartesian,2],
                AXIS["northing (X)",north,
                    ORDER[1],
                    LENGTHUNIT["metre",1]],
                AXIS["easting (Y)",east,
                    ORDER[2],
                    LENGTHUNIT["metre",1]],
            USAGE[
                SCOPE["Engineering survey, topographic mapping."],
                AREA["Madagascar - onshore."],
                BBOX[-25.64,43.18,-11.89,50.56]],
            ID["EPSG",8441]]],
    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",-198.383,
            ID["EPSG",8605]],
        PARAMETER["Y-axis translation",-240.517,
            ID["EPSG",8606]],
        PARAMETER["Z-axis translation",-107.909,
            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["Tananarive_1925_Laborde_Grid",
    GEOGCS["GCS_Tananarive_1925",
        DATUM["D_Tananarive_1925",
            SPHEROID["International_1924",6378388.0,297.0]],
        PRIMEM["Greenwich",0.0],
        UNIT["Degree",0.0174532925199433]],
    PROJECTION["Laborde_Oblique_Mercator"],
    PARAMETER["False_Easting",400000.0],
    PARAMETER["False_Northing",800000.0],
    PARAMETER["Scale_Factor",0.9995],
    PARAMETER["Azimuth",18.9],
    PARAMETER["Longitude_Of_Center",46.4372291666667],
    PARAMETER["Latitude_Of_Center",-18.9],
    UNIT["Meter",1.0]]

Definition: PROJ.4

+proj=labrd +lat_0=-18.9 +lon_0=46.4372291666667 +azi=18.9 +k=0.9995 +x_0=400000 +y_0=800000 +ellps=intl +towgs84=-198.383,-240.517,-107.909,0,0,0,0 +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:8441","+proj=labrd +lat_0=-18.9 +lon_0=46.4372291666667 +azi=18.9 +k=0.9995 +x_0=400000 +y_0=800000 +ellps=intl +towgs84=-198.383,-240.517,-107.909,0,0,0,0 +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": "Tananarive / Laborde Grid",
        "base_crs": {
            "name": "Tananarive",
            "datum": {
                "type": "GeodeticReferenceFrame",
                "name": "Tananarive 1925",
                "ellipsoid": {
                    "name": "International 1924",
                    "semi_major_axis": 6378388,
                    "inverse_flattening": 297
                }
            },
            "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": 4297
            }
        },
        "conversion": {
            "name": "Laborde Grid (Greenwich)",
            "method": {
                "name": "Laborde Oblique Mercator",
                "id": {
                    "authority": "EPSG",
                    "code": 9813
                }
            },
            "parameters": [
                {
                    "name": "Latitude of projection centre",
                    "value": -18.9,
                    "unit": "degree",
                    "id": {
                        "authority": "EPSG",
                        "code": 8811
                    }
                },
                {
                    "name": "Longitude of projection centre",
                    "value": 46.4372291666667,
                    "unit": "degree",
                    "id": {
                        "authority": "EPSG",
                        "code": 8812
                    }
                },
                {
                    "name": "Azimuth of initial line",
                    "value": 18.9,
                    "unit": "degree",
                    "id": {
                        "authority": "EPSG",
                        "code": 8813
                    }
                },
                {
                    "name": "Scale factor on initial line",
                    "value": 0.9995,
                    "unit": "unity",
                    "id": {
                        "authority": "EPSG",
                        "code": 8815
                    }
                },
                {
                    "name": "False easting",
                    "value": 400000,
                    "unit": "metre",
                    "id": {
                        "authority": "EPSG",
                        "code": 8806
                    }
                },
                {
                    "name": "False northing",
                    "value": 800000,
                    "unit": "metre",
                    "id": {
                        "authority": "EPSG",
                        "code": 8807
                    }
                }
            ]
        },
        "coordinate_system": {
            "subtype": "Cartesian",
            "axis": [
                {
                    "name": "Northing",
                    "abbreviation": "X",
                    "direction": "north",
                    "unit": "metre"
                },
                {
                    "name": "Easting",
                    "abbreviation": "Y",
                    "direction": "east",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 8441
        }
    },
    "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": -198.383,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8605
                }
            },
            {
                "name": "Y-axis translation",
                "value": -240.517,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8606
                }
            },
            {
                "name": "Z-axis translation",
                "value": -107.909,
                "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

8441=PROJCS["Tananarive / Laborde Grid",GEOGCS["Tananarive",DATUM["Tananarive_1925",SPHEROID["International 1924",6378388,297],TOWGS84[-198.383,-240.517,-107.909,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4297"]],PROJECTION["Laborde_Oblique_Mercator"],PARAMETER["latitude_of_center",-18.9],PARAMETER["longitude_of_center",46.4372291666667],PARAMETER["azimuth",18.9],PARAMETER["scale_factor",0.9995],PARAMETER["false_easting",400000],PARAMETER["false_northing",800000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","8441"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=labrd"
	"lat_0=-18.9"
	"lon_0=46.4372291666667"
	"azi=18.9"
	"k=0.9995"
	"x_0=400000"
	"y_0=800000"
	"ellps=intl"
	"towgs84=-198.383,-240.517,-107.909,0,0,0,0"
	"units=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=labrd +lat_0=-18.9 +lon_0=46.4372291666667 +azi=18.9 +k=0.9995 +x_0=400000 +y_0=800000 +ellps=intl +towgs84=-198.383,-240.517,-107.909,0,0,0,0 +units=m +no_defs +type=crs">
	<Layer srs="+proj=labrd +lat_0=-18.9 +lon_0=46.4372291666667 +azi=18.9 +k=0.9995 +x_0=400000 +y_0=800000 +ellps=intl +towgs84=-198.383,-240.517,-107.909,0,0,0,0 +units=m +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 8441, 'EPSG', 8441, '+proj=labrd +lat_0=-18.9 +lon_0=46.4372291666667 +azi=18.9 +k=0.9995 +x_0=400000 +y_0=800000 +ellps=intl +towgs84=-198.383,-240.517,-107.909,0,0,0,0 +units=m +no_defs +type=crs', 'PROJCS["Tananarive / Laborde Grid",GEOGCS["Tananarive",DATUM["Tananarive_1925",SPHEROID["International 1924",6378388,297],TOWGS84[-198.383,-240.517,-107.909,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4297"]],PROJECTION["Laborde_Oblique_Mercator"],PARAMETER["latitude_of_center",-18.9],PARAMETER["longitude_of_center",46.4372291666667],PARAMETER["azimuth",18.9],PARAMETER["scale_factor",0.9995],PARAMETER["false_easting",400000],PARAMETER["false_northing",800000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","8441"]]');