EPSG:8441

Tananarive / Laborde Grid

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.

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)

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]]

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/v0.5/projjson.schema.json",
    "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"
            }
        ]
    },
    "scope": "Engineering survey, topographic mapping.",
    "area": "Madagascar - onshore.",
    "bbox": {
        "south_latitude": -25.64,
        "west_longitude": 43.18,
        "north_latitude": -11.89,
        "east_longitude": 50.56
    },
    "id": {
        "authority": "EPSG",
        "code": 8441
    }
}

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"]]');