EPSG systems

EPSG:5257 TUREF / TM39

Projected system (Transverse Mercator) in use: Turkey - 37.5°E to 40.5°E onshore. The full definition below, and conversion in one click.

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System record
Code	EPSG:5257
Name	TUREF / TM39
Type	Projected system — Transverse Mercator
Area of use	Turkey - 37.5°E to 40.5°E onshore Türkiye (Turkey) - between 37°30'E and 40°30'E, onshore.
Bounds	W 37,50° · S 36,66° · E 40,50° · N 41,19°
Countries	Türkiye
Datum	Turkish National Reference Frame
Ellipsoid	GRS 1980 a = 6378137 m · 1/f = 298.257222101
Base geographic system	EPSG:5252 — TUREF
Unit	metre (X north, Y east)
Transformation to WGS 84	TUREF to WGS 84 (1) (EPSG:5261) — accuracy 1 m
Scope	Cadastre, engineering survey, topographic mapping (large scale).

Projection parameters

Parameter	Value	Unit
Latitude of natural origin	0	degree
Longitude of natural origin	39	degree
Scale factor at natural origin	1	unity
False easting	500000	metre
False northing	0	metre

proj4 definition

+proj=tmerc +lat_0=0 +lon_0=39 +k=1 +x_0=500000 +y_0=0 +ellps=GRS80 +units=m +towgs84=0,0,0 +no_defs

Paste it into QGIS, proj4js, PostGIS (spatial_ref_sys) or GDAL. +towgs84 carries the EPSG transformation to WGS 84; the official code stays EPSG:5257.

WKT (ESRI format, the .prj content)

PROJCS["TUREF_TM39",GEOGCS["GCS_TUREF",DATUM["D_Turkish_National_Reference_Frame",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",39.0],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]

All systems — Türkiye

Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.

Projection parameters

proj4 definition

WKT (ESRI format, the .prj content)

Other systems — Türkiye