EPSG:29903 TM75 / Irish Grid
Projected system (Transverse Mercator) in use: Europe - Ireland (Republic and Ulster) - onshore. The full definition below, and conversion in one click.
| Code | EPSG:29903 |
|---|---|
| Name | TM75 / Irish Grid |
| Type | Projected system — Transverse Mercator |
| Area of use |
Europe - Ireland (Republic and Ulster) - onshore Ireland - onshore. United Kingdom (UK) - Northern Ireland (Ulster) - onshore. |
| Bounds | W -10,56° · S 51,39° · E -5,34° · N 55,43° |
| Countries | Ireland, United Kingdom |
| Datum | Geodetic Datum of 1965 |
| Ellipsoid | Airy Modified 1849 a = 6377340.189 m · 1/f = 299.3249646 |
| Base geographic system | EPSG:4300 — TM75 |
| Unit | metre (E east, N north) |
| Transformation to WGS 84 | TM75 to WGS 84 (2) (EPSG:1954) — accuracy 1 m |
| Scope | Engineering survey, topographic mapping. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 53.5 | degree |
| Longitude of natural origin | -8 | degree |
| Scale factor at natural origin | 1.000035 | unity |
| False easting | 200000 | metre |
| False northing | 250000 | metre |
proj4 definition
+proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1.000035 +x_0=200000 +y_0=250000 +a=6377340.189 +rf=299.3249646 +units=m +towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15 +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:29903.
WKT (ESRI format, the .prj content)
PROJCS["TM75_Irish_Grid",GEOGCS["GCS_TM75",DATUM["D_TM75",SPHEROID["Airy_Modified",6377340.189,299.3249646]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",200000.0],PARAMETER["False_Northing",250000.0],PARAMETER["Central_Meridian",-8.0],PARAMETER["Scale_Factor",1.000035],PARAMETER["Latitude_Of_Origin",53.5],UNIT["Meter",1.0]]Other systems — Ireland
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.