EPSG:3108 ETRS89 / Guernsey Grid
Projected system (Transverse Mercator) in use: Channel Islands - Guernsey, Alderney, Sark. The full definition below, and conversion in one click.
| Code | EPSG:3108 |
|---|---|
| Name | ETRS89 / Guernsey Grid |
| Type | Projected system — Transverse Mercator |
| Area of use |
Channel Islands - Guernsey, Alderney, Sark Channel Islands - Guernsey, Alderney, Sark, Herm, Brecqhou, Jethou, Lihou - onshore and offshore. |
| Bounds | W -3,06° · S 49,21° · E -2,03° · N 49,94° |
| Countries | Jersey, Guernsey |
| Datum | European Terrestrial Reference System 1989 |
| Ellipsoid | GRS 1980 a = 6378137 m · 1/f = 298.257222101 |
| Base geographic system | EPSG:4258 — ETRS89 |
| Unit | metre (E east, N north) |
| Transformation to WGS 84 | ETRS89 to WGS 84 (1) (EPSG:1149) — accuracy 1 m |
| Scope | Engineering survey, topographic mapping. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 49.5 | degree |
| Longitude of natural origin | -2.4166666666666665 | degree |
| Scale factor at natural origin | 0.999997 | unity |
| False easting | 47000 | metre |
| False northing | 50000 | metre |
proj4 definition
+proj=tmerc +lat_0=49.5 +lon_0=-2.41666666666667 +k=0.999997 +x_0=47000 +y_0=50000 +ellps=GRS80 +units=m +towgs84=0,0,0 +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:3108.
WKT (ESRI format, the .prj content)
PROJCS["ETRS_1989_Guernsey_Grid",GEOGCS["GCS_ETRS_1989",DATUM["D_ETRS_1989",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",47000.0],PARAMETER["False_Northing",50000.0],PARAMETER["Central_Meridian",-2.41666666666667],PARAMETER["Scale_Factor",0.999997],PARAMETER["Latitude_Of_Origin",49.5],UNIT["Meter",1.0]]Other systems — Jersey
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.