EPSG:8440

Laborde Grid (Greenwich)

Attributes

Data source: EPSG

Information source: Société des Pétroles de Madagascar.

Revision date: 2018-04-19

Scope: Engineering survey, topographic mapping.

Remarks: See Laborde Grid (projection code 19861) for original definition in grads with respect to the Paris meridian. This is equivalent.

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",46.4372291666667],
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 (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]],
    ID["EPSG",8440]]

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",46.4372291666667],
PARAMETER["Latitude_Of_Center",-18.9]

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

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:8440","+proj=labrd +lat_0=-18.9 +lon_0=46.4372291666667 +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 (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
            }
        }
    ],
    "id": {
        "authority": "EPSG",
        "code": 8440
    }
}

Definition: GeoServer

8440=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]

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"
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">
	<Layer srs="+proj=labrd +lat_0=-18.9 +lon_0=46.4372291666667 +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 ( 8440, 'EPSG', 8440, '+proj=labrd +lat_0=-18.9 +lon_0=46.4372291666667 +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",46.4372291666667],PARAMETER["azimuth",18.9],PARAMETER["scale_factor",0.9995],PARAMETER["false_easting",400000],PARAMETER["false_northing",800000]');