EPSG:4673

Chatham Islands 1979

Transform Get position on a map

Available transformations
to EPSG:4326
EPSG:4326 - WGS 84

  • New Zealand - Chatham Islands group - onshore. , accuracy 2.0 m, code 1081 (default) [7]

Selected transformation

Method: Coordinate Frame rotation (geog2D domain)

Remarks: Derived at 4 stations using concatenation through WGS72. Parameter vales are also used to transform CI1979 to NZGD2000 - see tfm code 1082.

Information source: Land Information New Zealand: LINZS25000 Standard for New Zealand Geodetic Datum 2000; 16 November 2007.

Revision date: 2020-03-14

Attributes

Unit: degree (supplier to define representation)

Geodetic CRS: Chatham Islands 1979

Datum: Chatham Islands Datum 1979

Ellipsoid: International 1924

Prime meridian: Greenwich

Data source: EPSG

Information source: Office of Surveyor General (OSG) Technical Report 14, June 2001.

Revision date: 2008-04-04

Scope: Geodesy.

Remarks: Replaces CI1971. Replaced by NZGD2000 from March 2000.

Area of use: New Zealand - Chatham Islands group - onshore.

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

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Center coordinates
-176.4 -43.97

WGS84 bounds:
-177.25 -44.64
-175.54 -43.3

New Zealand - Chatham Islands group - onshore.
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Definition: OGC Well Known Text

GEOGCS["Chatham Islands 1979",
    DATUM["Chatham_Islands_Datum_1979",
        SPHEROID["International 1924",6378388,297],
        TOWGS84[174.05,-25.49,112.57,0,0,-0.554,0.2263]],
    PRIMEM["Greenwich",0,
        AUTHORITY["EPSG","8901"]],
    UNIT["degree",0.0174532925199433,
        AUTHORITY["EPSG","9122"]],
    AUTHORITY["EPSG","4673"]]

Definition: OGC Well Known Text 2 (2019)

GEOGCRS["Chatham Islands 1979",
    DATUM["Chatham Islands Datum 1979",
        ELLIPSOID["International 1924",6378388,297,
            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["New Zealand - Chatham Islands group - onshore."],
        BBOX[-44.64,-177.25,-43.3,-175.54]],
    ID["EPSG",4673]]

Definition: ESRI Well Known Text

GEOGCS["GCS_Chatham_Islands_1979",
    DATUM["D_Chatham_Islands_1979",
        SPHEROID["International_1924",6378388.0,297.0]],
    PRIMEM["Greenwich",0.0],
    UNIT["Degree",0.0174532925199433]]

Definition: PROJ.4

+proj=longlat +ellps=intl +towgs84=174.05,-25.49,112.57,0,0,-0.554,0.2263 +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:4673","+proj=longlat +ellps=intl +towgs84=174.05,-25.49,112.57,0,0,-0.554,0.2263 +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeographicCRS",
    "name": "Chatham Islands 1979",
    "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "Chatham Islands Datum 1979",
        "ellipsoid": {
            "name": "International 1924",
            "semi_major_axis": 6378388,
            "inverse_flattening": 297
        }
    },
    "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": "New Zealand - Chatham Islands group - onshore.",
    "bbox": {
        "south_latitude": -44.64,
        "west_longitude": -177.25,
        "north_latitude": -43.3,
        "east_longitude": -175.54
    },
    "id": {
        "authority": "EPSG",
        "code": 4673
    }
}

Definition: GeoServer

4673=GEOGCS["Chatham Islands 1979",DATUM["Chatham_Islands_Datum_1979",SPHEROID["International 1924",6378388,297],TOWGS84[174.05,-25.49,112.57,0,0,-0.554,0.2263]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4673"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=longlat"
	"ellps=intl"
	"towgs84=174.05,-25.49,112.57,0,0,-0.554,0.2263"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +ellps=intl +towgs84=174.05,-25.49,112.57,0,0,-0.554,0.2263 +no_defs +type=crs">
	<Layer srs="+proj=longlat +ellps=intl +towgs84=174.05,-25.49,112.57,0,0,-0.554,0.2263 +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 4673, 'EPSG', 4673, '+proj=longlat +ellps=intl +towgs84=174.05,-25.49,112.57,0,0,-0.554,0.2263 +no_defs +type=crs', 'GEOGCS["Chatham Islands 1979",DATUM["Chatham_Islands_Datum_1979",SPHEROID["International 1924",6378388,297],TOWGS84[174.05,-25.49,112.57,0,0,-0.554,0.2263]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4673"]]');