EPSG Library · Kuwait, Bahrain, Oman

EPSG:3440 — PSD93 / UTM zone 40N

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

Summary

EPSG:3440 (PSD93 / UTM zone 40N) is a projected coordinate reference system on the PDO Survey Datum 1993 datum using the Transverse Mercator method, with coordinates in metres. Area of use: Oman - onshore east of 54°E.

Type: projected
Datum: PDO Survey Datum 1993
Units: metre
Axes: E, N
Central meridian: 57°

Definition

EPSG:3440 as published in the EPSG Dataset (PROJ 9.5.1).
Property	Value
EPSG code	EPSG:3440
Name	PSD93 / UTM zone 40N
Type	Projected CRS
Datum	PDO Survey Datum 1993
Ellipsoid	Clarke 1880 (RGS) (a = 6,378,249.145 m, 1/f = 293.465)
Prime meridian	Greenwich
Projection method	Transverse Mercator
Axes	Easting (E, east, metre); Northing (N, north, metre)
Scope	Oil and gas exploration and production.
Bounding box	54° to 59.91° longitude, 16.89° to 26.58° latitude

Area of use

Oman - onshore east of 54°E. Includes Musandam and the Kuria Muria (Al Hallaniyah) islands.

Projection parameters

Transverse Mercator parameters.
Parameter	Value	Unit
Latitude of natural origin	0	degree
Longitude of natural origin	57	degree
Scale factor at natural origin	0.9996	unity
False easting	500,000	metre
False northing	0	metre

Example coordinates

A WGS 84 point at longitude 58.5°, latitude 24.0° (inside the area of use) has these coordinates in EPSG:3440:

Computed with PROJ using the EPSG default operation: unavailable until proj_trans is called.
Axis	Value	Unit
E	652,285.428	m
N	2,654,790.184	m

At this point the projection scale factor is 0.99988758 and the grid convergence is +0.610223°.

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) + PSD93 to WGS 84 (1) + axis order change (2D)	0.5 m	Oman - onshore. Includes Musandam and the Kuria Muria (Al Hallaniyah) islands.
axis order change (2D) + PSD93 to WGS 72 (1) + WGS 72 to WGS 84 (1) + axis order change (2D)	3.2 m	Oman - onshore. Includes Musandam and the Kuria Muria (Al Hallaniyah) islands.
axis order change (2D) + PSD93 to WGS 84 (3) + axis order change (2D)	0.5 m	Oman - block 4.

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.

Definitions and downloads

PROJ string

+proj=utm +zone=40 +a=6378249.145 +rf=293.465 +units=m +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=utm +zone=40 +a=6378249.145 +rf=293.465 +units=m +towgs84=-180.624,-225.516,173.919,-0.81,-1.898,8.336,16.71006 +no_defs

Datum shift from PSD93 to WGS 84 (1) (EPSG accuracy 0.5 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

PROJCRS["PSD93 / UTM zone 40N", BASEGEOGCRS["PSD93", DATUM["PDO Survey Datum 1993", ELLIPSOID["Clarke 1880 (RGS)",6378249.145,293.465, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], ID["EPSG",4134]], CONVERSION["UTM zone 40N", METHOD["Transverse Mercator", ID["EPSG",9807]], PARAMETER["Latitude of natural origin",0, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8801]], PARAMETER["Longitude of natural origin",57, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8802]], PARAMETER["Scale factor at natural origin",0.9996, SCALEUNIT["unity",1], ID["EPSG",8805]], PARAMETER["False easting",500000, LENGTHUNIT["metre",1], ID["EPSG",8806]], PARAMETER["False northing",0, LENGTHUNIT["metre",1], ID["EPSG",8807]]], CS[Cartesian,2], AXIS["(E)",east, ORDER[1], LENGTHUNIT["metre",1]], AXIS["(N)",north, ORDER[2], LENGTHUNIT["metre",1]], USAGE[ SCOPE["Oil and gas exploration and production."], AREA["Oman - onshore east of 54°E. Includes Musandam and the Kuria Muria (Al Hallaniyah) islands."], BBOX[16.89,54,26.58,59.91]], ID["EPSG",3440]]

Downloads

3440.prj — ESRI WKT for shapefiles
3440.wkt — OGC WKT2:2019

FAQ

What is EPSG:3440?

Where can EPSG:3440 be used?

Its area of use is: Oman - onshore east of 54°E. Includes Musandam and the Kuria Muria (Al Hallaniyah) islands.

Is EPSG:3440 in metres or degrees?

EPSG:3440 is projected, so coordinates are easting and northing in metres, not degrees.

How do I convert EPSG:3440 to latitude and longitude?

Transform from EPSG:3440 to EPSG:4326 (WGS 84). In GeoCAD Bridge open the coordinate converter with EPSG:3440 preselected, enter easting and northing, and choose WGS 84 as the target.

What is the central meridian of EPSG:3440?

57° (UTM zone 40), with a scale factor of 0.9996, false easting 500 000 m and false northing 0 m.

How accurate is the transformation from EPSG:3440 to WGS 84?

The most accurate EPSG transformation listed here is “axis order change (2D) + PSD93 to WGS 84 (1) + axis order change (2D)”, with a stated accuracy of 0.5 m for Oman - onshore. Includes Musandam and the Kuria Muria (Al Hallaniyah) islands.. Always check the area of use before applying it.

Coordinate systems

Articles

Tools

References

IOGP. EPSG Geodetic Parameter Dataset, epsg.org/crs_3440.
PROJ 9.5.1 / pyproj 3.7.2, used to compute every value on this page.

Cite this page

GeoCAD Bridge. “EPSG:3440 — PSD93 / UTM zone 40N.” GeoCAD Bridge EPSG Library, updated 2026-10-05. https://www.geocadbridge.com/epsg/3440/