EPSG:19861

Laborde Grid

Attributes

Data source: EPSG

Information source: IGN Technical Note 74.

Revision date: 2018-04-20

Scope: Engineering survey, topographic mapping.

Remarks: Longitude is referenced to the Paris meridian. See Laborde Grid (Greenwich) (projection code 8440) for equivalent in degrees referenced to Greenwich. Within a few hundred km of origin, may be approximated by Oblique Mercator method - see proj code 19911.

Method: Laborde Oblique Mercator

Area of use: Madagascar - onshore and nearshore.

Description: (0,)

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Madagascar - onshore and nearshore.

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Definition: OGC Well Known Text

PROJECTION["Laborde_Oblique_Mercator"],
PARAMETER["latitude_of_center",-18.9],
PARAMETER["longitude_of_center",44.1],
PARAMETER["azimuth",18.9],
PARAMETER["scale_factor",0.9995],
PARAMETER["false_easting",400000],
PARAMETER["false_northing",800000]

Definition: OGC Well Known Text 2 (2019)

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]],
    ID["EPSG",19861]]

Definition: ESRI Well Known Text

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",44.1],
PARAMETER["Latitude_Of_Center",-18.9]

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

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:19861","+proj=labrd +lat_0=-18.9 +lon_0=44.1 +azi=18.9 +k=0.9995 +x_0=400000 +y_0=800000");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "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
            }
        }
    ],
    "id": {
        "authority": "EPSG",
        "code": 19861
    }
}

Definition: GeoServer

19861=PROJECTION["Laborde_Oblique_Mercator"],PARAMETER["latitude_of_center",-18.9],PARAMETER["longitude_of_center",44.1],PARAMETER["azimuth",18.9],PARAMETER["scale_factor",0.9995],PARAMETER["false_easting",400000],PARAMETER["false_northing",800000]

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"
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">
	<Layer srs="+proj=labrd +lat_0=-18.9 +lon_0=44.1 +azi=18.9 +k=0.9995 +x_0=400000 +y_0=800000">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 19861, 'EPSG', 19861, '+proj=labrd +lat_0=-18.9 +lon_0=44.1 +azi=18.9 +k=0.9995 +x_0=400000 +y_0=800000', 'PROJECTION["Laborde_Oblique_Mercator"],PARAMETER["latitude_of_center",-18.9],PARAMETER["longitude_of_center",44.1],PARAMETER["azimuth",18.9],PARAMETER["scale_factor",0.9995],PARAMETER["false_easting",400000],PARAMETER["false_northing",800000]');