EPSG:4121 — GGRS87

Geographic 2D · Greece - onshore

Export Formats

OGC WKT

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"]
]

WKT2

GEOGCRS[
    "GGRS87",
    DATUM[
        "Greek Geodetic Reference System 1987",
        ELLIPSOID[
            "GRS 1980",
            6378137,
            298.257222101,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",7019]
        ],
        ID["EPSG",6121]
    ],
    CS[ellipsoidal,2,ID["EPSG",6422]],
    AXIS["Geodetic latitude (Lat)",north],
    AXIS["Geodetic longitude (Lon)",east],
    ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
    ID["EPSG",4121]
]

PROJ.4

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

Proj4js

How to add a projection to Proj4js? →

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

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 4121,
  "name": "GGRS87",
  "kind": "geographic 2D",
  "area": "Greece - onshore",
  "unit": "degree (supplier to define representation)",
  "bbox": [
    34.88,
    19.57,
    41.75,
    28.3
  ],
  "proj4": "+proj=longlat +ellps=GRS80 +towgs84=-199.87,74.79,246.62,0,0,0,0 +no_defs +type=crs"
}

PostGIS

How to add a projection to 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"]]');

MapServer

How to add a projection to MapServer? →

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

GeoServer

How to add a projection to 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"]]

Related Coordinate Systems

Available Transformations (2)

Transformation	Source → Target	Accuracy (m)
GGRS87 to WGS 84 (1)	4121 → 4326	1
Greek to GGRS87 (1)	4120 → 4121	5

Other CRS using Greek Geodetic Reference System 1987

Frequently Asked Questions

How do I add EPSG:4121 to GeoServer?

Add the following definition to your GeoServer configuration:

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"]]

Read the full GeoServer guide →

How do I add EPSG:4121 to PostGIS?

Add the following definition to your PostGIS configuration:

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"]]');

Read the full PostGIS guide →

How do I add EPSG:4121 to MapServer?

Add the following definition to your MapServer configuration:

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

Read the full MapServer guide →

How do I use EPSG:4121 with Proj4js?

Add the following definition to your Proj4js configuration:

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

Read the full Proj4js guide →