EPSG Library · Levant, Iraq and Turkey

EPSG:5253 — TUREF / TM27

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

Summary

EPSG:5253 (TUREF / TM27) is a projected coordinate reference system on the Turkish National Reference Frame datum using the Transverse Mercator method, with coordinates in metres. Area of use: Türkiye (Turkey) - west of 28°30'E, onshore.

Type: projected
Datum: Turkish National Reference Frame
Units: metre
Axes: X, Y

Definition

EPSG:5253 as published in the EPSG Dataset (PROJ 9.5.1).
Property	Value
EPSG code	EPSG:5253
Name	TUREF / TM27
Type	Projected CRS
Datum	Turkish National Reference Frame
Ellipsoid	GRS 1980 (a = 6,378,137.000 m, 1/f = 298.257222)
Prime meridian	Greenwich
Projection method	Transverse Mercator
Axes	Northing (X, north, metre); Easting (Y, east, metre)
Scope	Cadastre, engineering survey, topographic mapping (large scale).
Bounding box	25.62° to 28.5° longitude, 36.5° to 42.11° latitude

Area of use

Türkiye (Turkey) - west of 28°30'E, onshore.

Projection parameters

Transverse Mercator parameters.
Parameter	Value	Unit
Latitude of natural origin	0	degree
Longitude of natural origin	27	degree
Scale factor at natural origin	1	unity
False easting	500,000	metre
False northing	0	metre

Example coordinates

A WGS 84 point at longitude 27.06°, latitude 39.305° (inside the area of use) has these coordinates in EPSG:5253:

Computed with PROJ using the EPSG default operation: axis order change (2D) + Inverse of TUREF to WGS 84 (1) + Gauss-Kruger CM 27E + axis order change (2D).
Axis	Value	Unit
X	505,175.196	m
Y	4,352,366.311	m

At this point the projection scale factor is 1.00000033 and the grid convergence is +0.038007°.

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) + TUREF to WGS 84 (1) + axis order change (2D)	1 m	Türkiye (Turkey) - 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.

Definitions and downloads

PROJ string

+proj=tmerc +lat_0=0 +lon_0=27 +k=1 +x_0=500000 +y_0=0 +ellps=GRS80 +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=tmerc +lat_0=0 +lon_0=27 +k=1 +x_0=500000 +y_0=0 +ellps=GRS80 +units=m +towgs84=0,0,0 +no_defs

Datum shift from TUREF to WGS 84 (1) (EPSG accuracy 1 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["TUREF / TM27", BASEGEOGCRS["TUREF", DATUM["Turkish National Reference Frame", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], ID["EPSG",5252]], CONVERSION["Gauss-Kruger CM 27E", METHOD["Transverse Mercator", ID["EPSG",9807]], PARAMETER["Latitude of natural origin",0, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8801]], PARAMETER["Longitude of natural origin",27, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8802]], PARAMETER["Scale factor at natural origin",1, 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["northing (X)",north, ORDER[1], LENGTHUNIT["metre",1]], AXIS["easting (Y)",east, ORDER[2], LENGTHUNIT["metre",1]], USAGE[ SCOPE["Cadastre, engineering survey, topographic mapping (large scale)."], AREA["Türkiye (Turkey) - west of 28°30'E, onshore."], BBOX[36.5,25.62,42.11,28.5]], ID["EPSG",5253]]

Downloads

5253.prj — ESRI WKT for shapefiles
5253.wkt — OGC WKT2:2019

FAQ

What is EPSG:5253?

Where can EPSG:5253 be used?

Its area of use is: Türkiye (Turkey) - west of 28°30'E, onshore.

Is EPSG:5253 in metres or degrees?

EPSG:5253 is projected, so coordinates are northing and easting in metres, not degrees.

How do I convert EPSG:5253 to latitude and longitude?

Transform from EPSG:5253 to EPSG:4326 (WGS 84). In GeoCAD Bridge open the coordinate converter with EPSG:5253 preselected, enter easting and northing, and choose WGS 84 as the target.

How accurate is the transformation from EPSG:5253 to WGS 84?

The most accurate EPSG transformation listed here is “axis order change (2D) + TUREF to WGS 84 (1) + axis order change (2D)”, with a stated accuracy of 1 m for Türkiye (Turkey) - 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_5253.
PROJ 9.5.1 / pyproj 3.7.2, used to compute every value on this page.

Cite this page

GeoCAD Bridge. “EPSG:5253 — TUREF / TM27.” GeoCAD Bridge EPSG Library, updated 2026-10-05. https://www.geocadbridge.com/epsg/5253/