EPSG:9869 MRH21 Grid
Projected system (Transverse Mercator) in use: UK - Cardiff to Lincoln. 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.
| Code | EPSG:9869 |
|---|---|
| Name | MRH21 Grid |
| Type | Projected system — Transverse Mercator |
| Area of use |
UK - Cardiff to Lincoln United Kingdom (UK) - on or related to Midland Rail Hub, covering routes through Cardiff, Bristol, Gloucester, Derby, Birmingham, Leicester, and Lincoln. |
| Bounds | W -3,27° · S 51,35° · E -0,36° · N 53,26° |
| Countries | United Kingdom |
| Datum | MRH21 Intermediate Reference Frame |
| Ellipsoid | GRS 1980 a = 6378137 m · 1/f = 298.257222101 |
| Base geographic system | EPSG:9866 — MRH21-IRF |
| Unit | metre (E east, N north) |
| Transformation to WGS 84 | No simple transformation published (ellipsoid alone) |
| Scope | Engineering survey and topographic mapping for railway applications. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 52.3 | degree |
| Longitude of natural origin | -1.8 | degree |
| Scale factor at natural origin | 1 | unity |
| False easting | 227286.9881 | metre |
| False northing | 265751.2874 | metre |
proj4 definition
+proj=tmerc +lat_0=52.3 +lon_0=-1.8 +k=1 +x_0=227286.9881 +y_0=265751.2874 +ellps=GRS80 +units=m +no_defsPaste it into QGIS, proj4js, PostGIS (spatial_ref_sys) or GDAL. +towgs84 carries the EPSG transformation to WGS 84; the official code stays EPSG:9869.
WKT (ESRI format, the .prj content)
PROJCS["MRH21_Grid",GEOGCS["GCS_MRH21-IRF",DATUM["MRH21_Intermediate_Reference_Frame",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",227286.9881],PARAMETER["False_Northing",265751.2874],PARAMETER["Central_Meridian",-1.8],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",52.3],UNIT["Meter",1.0]]Other systems — United Kingdom
- EPSG:9739EOS21-IRF
- EPSG:9741EOS21 Grid
- EPSG:9758ECML14_NB-IRF
- EPSG:9761ECML14_NB Grid
- EPSG:9763EWR2-IRF
- EPSG:9766EWR2 Grid
- EPSG:9866MRH21-IRF
- EPSG:9871MOLDOR11-IRF
- EPSG:9880MOLDOR11 Grid
- EPSG:9939EBBWV14-IRF
- EPSG:9943EBBWV14 Grid
- EPSG:9964HULLEE13-IRF
- EPSG:9967HULLEE13 Grid
- EPSG:9969SCM22-IRF
- EPSG:9972SCM22 Grid
- EPSG:9974FNL22-IRF
- EPSG:9977FNL22 Grid
- EPSG:10175DoPw22-IRF
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.