EPSG systems

EPSG:9739 EOS21-IRF

Geographic system in latitude and longitude, in use: UK - Tweedmouth to Aberdeen. Datum, ellipsoid and transformation to WGS 84 below.

EPSG publishes no simple transformation to WGS 84 for this datum: conversion works on the ellipsoid alone and can be off by tens of metres.

Convert coordinates Open in Carte Download the .prj

System record
Code	EPSG:9739
Name	EOS21-IRF
Type	Geographic system
Area of use	UK - Tweedmouth to Aberdeen United Kingdom (UK) - on or related to the complex of rail routes in the East of Scotland, incorporating the route from Tweedbank through the Borders to Edinburgh; the line from Edinburgh to Aberdeen; routes via Kirkaldy and Cowdenbeath; and routes via Leuchars and Perth to Dundee.
Bounds	W -3,56° · S 55,55° · E -1,94° · N 57,21°
Countries	United Kingdom
Datum	EOS21 Intermediate Reference Frame
Ellipsoid	GRS 1980 a = 6378137 m · 1/f = 298.257222101
Unit	degree (Lat north, Lon east)
Transformation to WGS 84	No simple transformation published (ellipsoid alone)
Scope	Engineering survey and topographic mapping for railway applications.

proj4 definition

+proj=longlat +ellps=GRS80 +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:9739.

WKT (ESRI format, the .prj content)

GEOGCS["GCS_EOS21-IRF",DATUM["EOS21_Intermediate_Reference_Frame",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]

All systems — United Kingdom

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

proj4 definition

WKT (ESRI format, the .prj content)

Other systems — United Kingdom