EPSG systems

EPSG:10199 CWS13 Grid

Projected system (Transverse Mercator) in use: UK - Chester to Shrewsbury. The full definition below, and conversion in one click.

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.

System record
CodeEPSG:10199
NameCWS13 Grid
TypeProjected system — Transverse Mercator
Area of use UK - Chester to Shrewsbury
United Kingdom (UK) - on or related to the rail route from from Chester via Wrexham to Shrewsbury.
Bounds W -3,16° · S 52,50° · E -2,65° · N 53,26°
Countries United Kingdom
DatumCWS13 Intermediate Reference Frame
Ellipsoid GRS 1980 a = 6378137 m · 1/f = 298.257222101
Base geographic system EPSG:10196 — CWS13-IRF
Unit metre (E east, N north)
Transformation to WGS 84 No simple transformation published (ellipsoid alone)
ScopeEngineering survey and topographic mapping for railway applications.

Projection parameters

ParameterValueUnit
Latitude of natural origin52.4degree
Longitude of natural origin-2.9degree
Scale factor at natural origin1unity
False easting199668.0926metre
False northing89354.3229metre

proj4 definition

+proj=tmerc +lat_0=52.4 +lon_0=-2.9 +k=1 +x_0=199668.0926 +y_0=89354.3229 +ellps=GRS80 +units=m +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:10199.

WKT (ESRI format, the .prj content)

PROJCS["CWS13_Grid",GEOGCS["GCS_CWS13-IRF",DATUM["CWS13_Intermediate_Reference_Frame",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",199668.0926],PARAMETER["False_Northing",89354.3229],PARAMETER["Central_Meridian",-2.9],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",52.4],UNIT["Meter",1.0]]

All systems — United Kingdom

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