EPSG:2161 Sierra Leone 1968 / UTM zone 28N
Projected system (Transverse Mercator) in use: Sierra Leone - west of 12°W. The full definition below, and conversion in one click.
| Code | EPSG:2161 |
|---|---|
| Name | Sierra Leone 1968 / UTM zone 28N |
| Type | Projected system — Transverse Mercator |
| Area of use |
Sierra Leone - west of 12°W Sierra Leone - onshore west of 12°W. |
| Bounds | W -13,35° · S 7,15° · E -12,00° · N 9,94° |
| Countries | Sierra Leone |
| Datum | Sierra Leone 1968 |
| Ellipsoid | Clarke 1880 (RGS) a = 6378249.145 m · 1/f = 293.465 |
| Base geographic system | EPSG:4175 — Sierra Leone 1968 |
| Unit | metre (E east, N north) |
| Transformation to WGS 84 | Sierra Leone 1968 to WGS 84 (1) (EPSG:1614) — accuracy 26 m |
| Scope | Engineering survey, topographic mapping. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 0 | degree |
| Longitude of natural origin | -15 | degree |
| Scale factor at natural origin | 0.9996 | unity |
| False easting | 500000 | metre |
| False northing | 0 | metre |
proj4 definition
+proj=utm +zone=28 +a=6378249.145 +rf=293.465 +units=m +towgs84=-88,4,101 +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:2161.
WKT (ESRI format, the .prj content)
PROJCS["Sierra_Leone_1968_UTM_Zone_28N",GEOGCS["GCS_Sierra_Leone_1968",DATUM["D_Sierra_Leone_1968",SPHEROID["Clarke_1880_RGS",6378249.145,293.465]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-15.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]Other systems — Sierra Leone
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.