EPSG:4901

ATF (Paris)

Attributes

Unit: grad

Geodetic CRS: ATF (Paris)

Datum: Ancienne Triangulation Francaise (Paris)

Ellipsoid: Plessis 1817

Prime meridian: Paris RGS

Data source: EPSG

Revision date: 2007-11-01

Scope: Geodesy.

Remarks: ProjCRS covering all mainland France based on this datum used Bonne projection. In Alsace, suspected to be an extension of core network based on transformation of old German system.

Area of use: France - mainland onshore.

Coordinate system: Ellipsoidal 2D CS. Axes: latitude, longitude. Orientations: north, east. UoM: grads.

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SimpleMap

Center coordinates
-0.73 51.93

WGS84 bounds:
-4.87 42.33
8.23 51.14

France - mainland onshore.
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Definition: OGC Well Known Text

GEOGCS["ATF (Paris)",
    DATUM["Ancienne_Triangulation_Francaise_Paris",
        SPHEROID["Plessis 1817",6376523,308.64,
            AUTHORITY["EPSG","7027"]],
        AUTHORITY["EPSG","6901"]],
    PRIMEM["Paris RGS",2.33720833333333,
        AUTHORITY["EPSG","8914"]],
    UNIT["grad",0.0157079632679489,
        AUTHORITY["EPSG","9105"]],
    AUTHORITY["EPSG","4901"]]

Definition: OGC Well Known Text 2 (2019)

GEOGCRS["ATF (Paris)",
    DATUM["Ancienne Triangulation Francaise (Paris)",
        ELLIPSOID["Plessis 1817",6376523,308.64,
            LENGTHUNIT["metre",1]]],
    PRIMEM["Paris RGS",2.33720833333333,
        ANGLEUNIT["degree",0.0174532925199433]],
    CS[ellipsoidal,2],
        AXIS["geodetic latitude (Lat)",north,
            ORDER[1],
            ANGLEUNIT["grad",0.0157079632679489]],
        AXIS["geodetic longitude (Lon)",east,
            ORDER[2],
            ANGLEUNIT["grad",0.0157079632679489]],
    USAGE[
        SCOPE["Geodesy."],
        AREA["France - mainland onshore."],
        BBOX[42.33,-4.87,51.14,8.23]],
    ID["EPSG",4901]]

Definition: ESRI Well Known Text

GEOGCS["GCS_ATF_Paris",
    DATUM["D_ATF",
        SPHEROID["Plessis_1817",6376523.0,308.64]],
    PRIMEM["Paris_RGS",2.33720833333333],
    UNIT["Grad",0.0157079632679489]]

Definition: PROJ.4

+proj=longlat +a=6376523 +rf=308.64 +pm=2.33720833333333 +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:4901","+proj=longlat +a=6376523 +rf=308.64 +pm=2.33720833333333 +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeographicCRS",
    "name": "ATF (Paris)",
    "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "Ancienne Triangulation Francaise (Paris)",
        "ellipsoid": {
            "name": "Plessis 1817",
            "semi_major_axis": 6376523,
            "inverse_flattening": 308.64
        },
        "prime_meridian": {
            "name": "Paris RGS",
            "longitude": 2.33720833333333
        }
    },
    "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
                }
            }
        ]
    },
    "scope": "Geodesy.",
    "area": "France - mainland onshore.",
    "bbox": {
        "south_latitude": 42.33,
        "west_longitude": -4.87,
        "north_latitude": 51.14,
        "east_longitude": 8.23
    },
    "id": {
        "authority": "EPSG",
        "code": 4901
    }
}

Definition: GeoServer

4901=GEOGCS["ATF (Paris)",DATUM["Ancienne_Triangulation_Francaise_Paris",SPHEROID["Plessis 1817",6376523,308.64,AUTHORITY["EPSG","7027"]],AUTHORITY["EPSG","6901"]],PRIMEM["Paris RGS",2.33720833333333,AUTHORITY["EPSG","8914"]],UNIT["grad",0.0157079632679489,AUTHORITY["EPSG","9105"]],AUTHORITY["EPSG","4901"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=longlat"
	"a=6376523"
	"rf=308.64"
	"pm=2.33720833333333"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +a=6376523 +rf=308.64 +pm=2.33720833333333 +no_defs +type=crs">
	<Layer srs="+proj=longlat +a=6376523 +rf=308.64 +pm=2.33720833333333 +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 4901, 'EPSG', 4901, '+proj=longlat +a=6376523 +rf=308.64 +pm=2.33720833333333 +no_defs +type=crs', 'GEOGCS["ATF (Paris)",DATUM["Ancienne_Triangulation_Francaise_Paris",SPHEROID["Plessis 1817",6376523,308.64,AUTHORITY["EPSG","7027"]],AUTHORITY["EPSG","6901"]],PRIMEM["Paris RGS",2.33720833333333,AUTHORITY["EPSG","8914"]],UNIT["grad",0.0157079632679489,AUTHORITY["EPSG","9105"]],AUTHORITY["EPSG","4901"]]');