EPSG systems

EPSG:10175 DoPw22-IRF

Geographic system in latitude and longitude, in use: UK - Dovey Junction to Pwllheli. 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.

System record
CodeEPSG:10175
NameDoPw22-IRF
TypeGeographic system
Area of use UK - Dovey Junction to Pwllheli
United Kingdom (UK) - on or related to the rail route from Dovey Junction to Pwllheli.
Bounds W -4,51° · S 52,45° · E -3,80° · N 53,01°
Countries United Kingdom
DatumDoPw22 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)
ScopeEngineering 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:10175.

WKT (ESRI format, the .prj content)

GEOGCS["GCS_DoPw22-IRF",DATUM["DoPw22_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.