EPSG:29701

Tananarive (Paris) / Laborde Grid

Available transformations
to EPSG:4326
EPSG:4326 - WGS 84

Selected transformation

Remarks: Used by OMV.

Information source: OGP

Revision date: 2020-03-14

Steps of transformation: 1265 6873

Attributes

Unit: metre

Geodetic CRS: Tananarive (Paris)

Datum: Tananarive 1925 (Paris)

Ellipsoid: International 1924

Prime meridian: Paris

Data source: EPSG

Information source: Société des Pétroles de Madagascar.

Revision date: 2018-04-20

Steps of transformation: 1265 6873

Scope: Engineering survey, topographic mapping.

Remarks: See Tananarive / Laborde Grid (CRS code 8441) for equivalent referenced to Greenwich. May be approximated by Tananarive (Paris) / Laborde Grid approximation - see CRS code 29702.

Area of use: Madagascar - onshore.

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

Center coordinates
445630.14 815027.18

Projected bounds:
72529.11 50717.38
849613.92 1571200.18

WGS84 bounds:
43.18 -25.64
50.56 -11.89

Madagascar - onshore.
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Definition: PROJ.4

+proj=labrd +lat_0=-18.9 +lon_0=44.1 +azi=18.9 +k=0.9995 +x_0=400000 +y_0=800000 +ellps=intl +pm=paris +towgs84=-198.383,-240.517,-107.909,0,0,0,0 +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js)

proj4.defs("EPSG:29701","+proj=labrd +lat_0=-18.9 +lon_0=44.1 +azi=18.9 +k=0.9995 +x_0=400000 +y_0=800000 +ellps=intl +pm=paris +towgs84=-198.383,-240.517,-107.909,0,0,0,0 +units=m +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.4/projjson.schema.json",
    "type": "BoundCRS",
    "source_crs": {
        "type": "ProjectedCRS",
        "name": "Tananarive (Paris) / Laborde Grid",
        "base_crs": {
            "name": "Tananarive (Paris)",
            "datum": {
                "type": "GeodeticReferenceFrame",
                "name": "Tananarive 1925 (Paris)",
                "ellipsoid": {
                    "name": "International 1924",
                    "semi_major_axis": 6378388,
                    "inverse_flattening": 297
                },
                "prime_meridian": {
                    "name": "Paris",
                    "longitude": {
                        "value": 2.5969213,
                        "unit": {
                            "type": "AngularUnit",
                            "name": "grad",
                            "conversion_factor": 0.0157079632679489
                        }
                    }
                }
            },
            "coordinate_system": {
                "subtype": "ellipsoidal",
                "axis": [
                    {
                        "name": "Geodetic latitude",
                        "abbreviation": "Lat",
                        "direction": "north",
                        "unit": {
                            "type": "AngularUnit",
                            "name": "grad",
                            "conversion_factor": 0.0157079632679489
                        }
                    },
                    {
                        "name": "Geodetic longitude",
                        "abbreviation": "Lon",
                        "direction": "east",
                        "unit": {
                            "type": "AngularUnit",
                            "name": "grad",
                            "conversion_factor": 0.0157079632679489
                        }
                    }
                ]
            },
            "id": {
                "authority": "EPSG",
                "code": 4810
            }
        },
        "conversion": {
            "name": "Laborde Grid",
            "method": {
                "name": "Laborde Oblique Mercator",
                "id": {
                    "authority": "EPSG",
                    "code": 9813
                }
            },
            "parameters": [
                {
                    "name": "Latitude of projection centre",
                    "value": -21,
                    "unit": {
                        "type": "AngularUnit",
                        "name": "grad",
                        "conversion_factor": 0.0157079632679489
                    },
                    "id": {
                        "authority": "EPSG",
                        "code": 8811
                    }
                },
                {
                    "name": "Longitude of projection centre",
                    "value": 49,
                    "unit": {
                        "type": "AngularUnit",
                        "name": "grad",
                        "conversion_factor": 0.0157079632679489
                    },
                    "id": {
                        "authority": "EPSG",
                        "code": 8812
                    }
                },
                {
                    "name": "Azimuth of initial line",
                    "value": 21,
                    "unit": {
                        "type": "AngularUnit",
                        "name": "grad",
                        "conversion_factor": 0.0157079632679489
                    },
                    "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": 29701
        }
    },
    "target_crs": {
        "type": "GeographicCRS",
        "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
        }
    },
    "transformation": {
        "name": "Tananarive (Paris) to Tananarive (1)",
        "method": {
            "name": "Longitude rotation",
            "id": {
                "authority": "EPSG",
                "code": 9601
            }
        },
        "parameters": [
            {
                "name": "Longitude offset",
                "value": 8414.02501199997,
                "unit": {
                    "type": "Unit",
                    "name": "",
                    "conversion_factor": 1
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8602
                }
            }
        ],
        "id": {
            "authority": "EPSG",
            "code": 1265
        }
    }
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=labrd"
	"lat_0=-18.9"
	"lon_0=44.1"
	"azi=18.9"
	"k=0.9995"
	"x_0=400000"
	"y_0=800000"
	"ellps=intl"
	"pm=paris"
	"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=44.1 +azi=18.9 +k=0.9995 +x_0=400000 +y_0=800000 +ellps=intl +pm=paris +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=44.1 +azi=18.9 +k=0.9995 +x_0=400000 +y_0=800000 +ellps=intl +pm=paris +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 ( 29701, 'EPSG', 29701, '+proj=labrd +lat_0=-18.9 +lon_0=44.1 +azi=18.9 +k=0.9995 +x_0=400000 +y_0=800000 +ellps=intl +pm=paris +towgs84=-198.383,-240.517,-107.909,0,0,0,0 +units=m +no_defs +type=crs', 'None');

Definition: OGC WKT 2 (2019)

BOUNDCRS[SOURCECRS[PROJCRS["Tananarive (Paris) / Laborde Grid",BASEGEOGCRS["Tananarive (Paris)",DATUM["Tananarive 1925 (Paris)",ELLIPSOID["International 1924",6378388,297,LENGTHUNIT["metre",1]]],PRIMEM["Paris",2.5969213,ANGLEUNIT["grad",0.0157079632679489]],ID["EPSG",4810]],CONVERSION["Laborde Grid",METHOD["Laborde Oblique Mercator",ID["EPSG",9813]],PARAMETER["Latitude of projection centre",-21,ANGLEUNIT["grad",0.0157079632679489],ID["EPSG",8811]],PARAMETER["Longitude of projection centre",49,ANGLEUNIT["grad",0.0157079632679489],ID["EPSG",8812]],PARAMETER["Azimuth of initial line",21,ANGLEUNIT["grad",0.0157079632679489],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]],ID["EPSG",29701]]],TARGETCRS[GEOGCRS["Tananarive",DATUM["Tananarive 1925",ELLIPSOID["International 1924",6378388,297,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",4297]]],ABRIDGEDTRANSFORMATION["Tananarive (Paris) to Tananarive (1)",METHOD["Longitude rotation",ID["EPSG",9601]],PARAMETER["Longitude offset",8414.02501199997,ID["EPSG",8602]],ID["EPSG",1265]]]