EPSG:4020 DEPRECATED

Unknown datum based upon the Helmert 1906 ellipsoid

Attributes

Unit: degree (supplier to define representation)

Geodetic CRS: Unknown datum based upon the Helmert 1906 ellipsoid

Datum: Not specified (based on Helmert 1906 ellipsoid)

Ellipsoid: Helmert 1906

Prime meridian: Greenwich

Data source: EPSG

Information source: OGP

Revision date: 2004-01-06

Scope: Not recommended.

Remarks: Use only in cases where geodetic datum is unknown.

Area of use: Not specified.

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

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SimpleMap

Center coordinates
0.0 0.0

WGS84 bounds:
-180.0 -90.0
180.0 90.0

Not specified.
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Definition: OGC Well Known Text

GEOGCS["Unknown datum based upon the Helmert 1906 ellipsoid (deprecated)",
    DATUM["Not_specified_based_on_Helmert_1906_ellipsoid",
        SPHEROID["Helmert 1906",6378200,298.3,
            AUTHORITY["EPSG","7020"]],
        AUTHORITY["EPSG","6020"]],
    PRIMEM["Greenwich",0,
        AUTHORITY["EPSG","8901"]],
    UNIT["degree",0.0174532925199433,
        AUTHORITY["EPSG","9122"]],
    AUTHORITY["EPSG","4020"]]

Definition: OGC Well Known Text 2 (2019)

GEOGCRS["Unknown datum based upon the Helmert 1906 ellipsoid",
    DATUM["Not specified (based on Helmert 1906 ellipsoid)",
        ELLIPSOID["Helmert 1906",6378200,298.3,
            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]],
    USAGE[
        SCOPE["Not recommended."],
        AREA["Not specified."],
        BBOX[-90,-180,90,180]],
    ID["EPSG",4020]]

Definition: ESRI Well Known Text

GEOGCS["GCS_Helmert_1906",
    DATUM["D_Helmert_1906",
        SPHEROID["Helmert_1906",6378200.0,298.3]],
    PRIMEM["Greenwich",0.0],
    UNIT["Degree",0.0174532925199433]]

Definition: PROJ.4

+proj=longlat +ellps=helmert +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:4020","+proj=longlat +ellps=helmert +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeographicCRS",
    "name": "Unknown datum based upon the Helmert 1906 ellipsoid",
    "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "Not specified (based on Helmert 1906 ellipsoid)",
        "ellipsoid": {
            "name": "Helmert 1906",
            "semi_major_axis": 6378200,
            "inverse_flattening": 298.3
        }
    },
    "coordinate_system": {
        "subtype": "ellipsoidal",
        "axis": [
            {
                "name": "Geodetic latitude",
                "abbreviation": "Lat",
                "direction": "north",
                "unit": "degree"
            },
            {
                "name": "Geodetic longitude",
                "abbreviation": "Lon",
                "direction": "east",
                "unit": "degree"
            }
        ]
    },
    "scope": "Not recommended.",
    "area": "Not specified.",
    "bbox": {
        "south_latitude": -90,
        "west_longitude": -180,
        "north_latitude": 90,
        "east_longitude": 180
    },
    "id": {
        "authority": "EPSG",
        "code": 4020
    }
}

Definition: GeoServer

4020=GEOGCS["Unknown datum based upon the Helmert 1906 ellipsoid (deprecated)",DATUM["Not_specified_based_on_Helmert_1906_ellipsoid",SPHEROID["Helmert 1906",6378200,298.3,AUTHORITY["EPSG","7020"]],AUTHORITY["EPSG","6020"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4020"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=longlat"
	"ellps=helmert"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +ellps=helmert +no_defs +type=crs">
	<Layer srs="+proj=longlat +ellps=helmert +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 4020, 'EPSG', 4020, '+proj=longlat +ellps=helmert +no_defs +type=crs', 'GEOGCS["Unknown datum based upon the Helmert 1906 ellipsoid (deprecated)",DATUM["Not_specified_based_on_Helmert_1906_ellipsoid",SPHEROID["Helmert 1906",6378200,298.3,AUTHORITY["EPSG","7020"]],AUTHORITY["EPSG","6020"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4020"]]');