EPSG Library · Americas and Asia-Pacific

EPSG:7844 — GDA2020

Source: EPSG Dataset via PROJ 9.5.1 · Updated 2026-10-05

Summary

EPSG:7844 (GDA2020) is a geographic 2D coordinate reference system on the Geocentric Datum of Australia 2020 datum with coordinates in degrees. Area of use: Australia including Lord Howe Island, Macquarie Island, Ashmore and Cartier Islands, Christmas Island, Cocos (Keeling) Islands, Norfolk Island.

Type: geographic 2D
Datum: Geocentric Datum of Australia 2020
Units: degree
Axes: Lat, Lon

Definition

EPSG:7844 as published in the EPSG Dataset (PROJ 9.5.1).
Property	Value
EPSG code	EPSG:7844
Name	GDA2020
Type	Geographic 2d CRS
Datum	Geocentric Datum of Australia 2020
Ellipsoid	GRS 1980 (a = 6,378,137.000 m, 1/f = 298.257222)
Prime meridian	Greenwich
Axes	Geodetic latitude (Lat, north, degree); Geodetic longitude (Lon, east, degree)
Scope	Geodesy, cadastre, engineering survey, topographic mapping.
Bounding box	93.41° to 173.34° longitude, -60.55° to -8.47° latitude

Area of use

Australia including Lord Howe Island, Macquarie Island, Ashmore and Cartier Islands, Christmas Island, Cocos (Keeling) Islands, Norfolk Island. All onshore and offshore.

Example coordinates

A WGS 84 point at longitude 133.375°, latitude -34.51° (inside the area of use) has these coordinates in EPSG:7844:

Computed with PROJ using the EPSG default operation: unavailable until proj_trans is called.
Axis	Value	Unit
Longitude	133.375000	°
Latitude	-34.510000	°

Open this conversion in the coordinate converter

Transformations to WGS 84

Candidate operations from the EPSG Dataset, best first as ranked by PROJ.
Operation	Accuracy	Area of use
axis order change (2D) + GDA2020 to WGS 84 (2) + axis order change (2D)	3 m	Australia including Lord Howe Island, Macquarie Island, Ashmore and Cartier Islands, Christmas Island, Cocos (Keeling) Islands, Norfolk Island. All onshore and offshore.
axis order change (2D) + Inverse of WGS 84 to GDA2020 (3) + axis order change (2D)	3 m	Australia including Lord Howe Island, Macquarie Island, Ashmore and Cartier Islands, Christmas Island, Cocos (Keeling) Islands, Norfolk Island. All onshore and offshore.

Transformations change the datum, so each has an accuracy and an area of use. Choose the most accurate one that covers your data and record its name. See datum transformations.

Grid-based operations not bundled with standard PROJ installs: Inverse of WGS 84 to GDA2020 (4).

Definitions and downloads

PROJ string

+proj=longlat +ellps=GRS80 +no_defs +type=crs

A PROJ string cannot carry every EPSG detail (axis order, datum ensemble, transformations). Prefer WKT2 or the EPSG code itself.

Proj4js definition used by the converter

+proj=longlat +ellps=GRS80 +towgs84=0,0,0 +no_defs

Datum shift from GDA2020 to WGS 84 (2) (EPSG accuracy 3 m), the best single Helmert operation for this area of use. Where PROJ prefers a grid-based or multi-step operation (see the table above), results can differ by up to that operation's accuracy.

WKT2:2019

GEOGCRS["GDA2020", DATUM["Geocentric Datum of Australia 2020", 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, cadastre, engineering survey, topographic mapping."], AREA["Australia including Lord Howe Island, Macquarie Island, Ashmore and Cartier Islands, Christmas Island, Cocos (Keeling) Islands, Norfolk Island. All onshore and offshore."], BBOX[-60.55,93.41,-8.47,173.34]], ID["EPSG",7844]]

Downloads

7844.prj — ESRI WKT for shapefiles
7844.wkt — OGC WKT2:2019

FAQ

What is EPSG:7844?

Where can EPSG:7844 be used?

Its area of use is: Australia including Lord Howe Island, Macquarie Island, Ashmore and Cartier Islands, Christmas Island, Cocos (Keeling) Islands, Norfolk Island. All onshore and offshore.

What is the axis order of EPSG:7844?

By the EPSG definition: Geodetic latitude, Geodetic longitude. Many GIS formats such as GeoJSON and KML store longitude first instead.

How accurate is the transformation from EPSG:7844 to WGS 84?

The most accurate EPSG transformation listed here is “axis order change (2D) + GDA2020 to WGS 84 (2) + axis order change (2D)”, with a stated accuracy of 3 m for Australia including Lord Howe Island, Macquarie Island, Ashmore and Cartier Islands, Christmas Island, Cocos (Keeling) Islands, Norfolk Island. All onshore and offshore.. Always check the area of use before applying it.

Coordinate systems

Articles

Tools

References

IOGP. EPSG Geodetic Parameter Dataset, epsg.org/crs_7844.
PROJ 9.5.1 / pyproj 3.7.2, used to compute every value on this page.

Cite this page

GeoCAD Bridge. “EPSG:7844 — GDA2020.” GeoCAD Bridge EPSG Library, updated 2026-10-05. https://www.geocadbridge.com/epsg/7844/