EPSG:4121

GGRS87

Transform Get position on a map

Available transformations
to EPSG:4326
No other targets exist for this CRS

  • Greece - onshore. , accuracy 1.0 m, code 1272 (default) [3]

Selected transformation

Method: Geocentric translations (geog2D domain)

Remarks:

Information source: Geodesy Department; Public Petroleum Corporation of Greece.

Revision date: 2020-03-14

Attributes

Unit: degree (supplier to define representation)

Geodetic CRS: GGRS87

Datum: Greek Geodetic Reference System 1987

Ellipsoid: GRS 1980

Prime meridian: Greenwich

Data source: EPSG

Information source: Geodesy Department; Public Petroleum Corporation of Greece.

Revision date: 2011-07-20

Scope: Geodesy.

Area of use: Greece - onshore.

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

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Center coordinates
23.93 38.31

WGS84 bounds:
19.57 34.88
28.3 41.75

Greece - onshore.
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Definition: OGC Well Known Text

GEOGCS["GGRS87",
    DATUM["Greek_Geodetic_Reference_System_1987",
        SPHEROID["GRS 1980",6378137,298.257222101],
        TOWGS84[-199.87,74.79,246.62,0,0,0,0]],
    PRIMEM["Greenwich",0,
        AUTHORITY["EPSG","8901"]],
    UNIT["degree",0.0174532925199433,
        AUTHORITY["EPSG","9122"]],
    AUTHORITY["EPSG","4121"]]

Definition: OGC Well Known Text 2 (2019)

GEOGCRS["GGRS87",
    DATUM["Greek Geodetic Reference System 1987",
        ELLIPSOID["GRS 1980",6378137,298.257222101,
            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["Geodesy."],
        AREA["Greece - onshore."],
        BBOX[34.88,19.57,41.75,28.3]],
    ID["EPSG",4121]]

Definition: ESRI Well Known Text

GEOGCS["GCS_GGRS_1987",
    DATUM["D_GGRS_1987",
        SPHEROID["GRS_1980",6378137.0,298.257222101]],
    PRIMEM["Greenwich",0.0],
    UNIT["Degree",0.0174532925199433]]

Definition: PROJ.4

+proj=longlat +ellps=GRS80 +towgs84=-199.87,74.79,246.62,0,0,0,0 +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:4121","+proj=longlat +ellps=GRS80 +towgs84=-199.87,74.79,246.62,0,0,0,0 +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeographicCRS",
    "name": "GGRS87",
    "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "Greek Geodetic Reference System 1987",
        "ellipsoid": {
            "name": "GRS 1980",
            "semi_major_axis": 6378137,
            "inverse_flattening": 298.257222101
        }
    },
    "coordinate_system": {
        "subtype": "ellipsoidal",
        "axis": [
            {
                "name": "Geodetic latitude",
                "abbreviation": "Lat",
                "direction": "north",
                "unit": "degree"
            },
            {
                "name": "Geodetic longitude",
                "abbreviation": "Lon",
                "direction": "east",
                "unit": "degree"
            }
        ]
    },
    "scope": "Geodesy.",
    "area": "Greece - onshore.",
    "bbox": {
        "south_latitude": 34.88,
        "west_longitude": 19.57,
        "north_latitude": 41.75,
        "east_longitude": 28.3
    },
    "id": {
        "authority": "EPSG",
        "code": 4121
    }
}

Definition: GeoServer

4121=GEOGCS["GGRS87",DATUM["Greek_Geodetic_Reference_System_1987",SPHEROID["GRS 1980",6378137,298.257222101],TOWGS84[-199.87,74.79,246.62,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4121"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=longlat"
	"ellps=GRS80"
	"towgs84=-199.87,74.79,246.62,0,0,0,0"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +ellps=GRS80 +towgs84=-199.87,74.79,246.62,0,0,0,0 +no_defs +type=crs">
	<Layer srs="+proj=longlat +ellps=GRS80 +towgs84=-199.87,74.79,246.62,0,0,0,0 +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 4121, 'EPSG', 4121, '+proj=longlat +ellps=GRS80 +towgs84=-199.87,74.79,246.62,0,0,0,0 +no_defs +type=crs', 'GEOGCS["GGRS87",DATUM["Greek_Geodetic_Reference_System_1987",SPHEROID["GRS 1980",6378137,298.257222101],TOWGS84[-199.87,74.79,246.62,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4121"]]');