EPSG:7877 Astro DOS 71 / SHLG71
Projected system (Transverse Mercator) in use: St Helena - St Helena Island. The full definition below, and conversion in one click.
| Code | EPSG:7877 |
|---|---|
| Name | Astro DOS 71 / SHLG71 |
| Type | Projected system — Transverse Mercator |
| Area of use |
St Helena - St Helena Island St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore. |
| Bounds | W -5,85° · S -16,08° · E -5,59° · N -15,85° |
| Countries | St. Helena |
| Datum | Astro DOS 71 |
| Ellipsoid | International 1924 a = 6378388 m · 1/f = 297 |
| Base geographic system | EPSG:4710 — Astro DOS 71 |
| Unit | metre (E east, N north) |
| Transformation to WGS 84 | Astro DOS 71 to WGS 84 (2) (EPSG:7894) — accuracy 1 m |
| Scope | Topographic mapping. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | -15.966666666666667 | degree |
| Longitude of natural origin | -5.716666666666667 | degree |
| Scale factor at natural origin | 1 | unity |
| False easting | 300000 | metre |
| False northing | 2000000 | metre |
proj4 definition
+proj=tmerc +lat_0=-15.9666666666667 +lon_0=-5.71666666666667 +k=1 +x_0=300000 +y_0=2000000 +ellps=intl +units=m +towgs84=-323.65,551.39,-491.22 +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:7877.
WKT (ESRI format, the .prj content)
PROJCS["Astro_DOS_71_4_SHLG71",GEOGCS["GCS_DOS_71_4",DATUM["D_DOS_71_4",SPHEROID["International_1924",6378388.0,297.0]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",300000.0],PARAMETER["False_Northing",2000000.0],PARAMETER["Central_Meridian",-5.71666666666667],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",-15.9666666666667],UNIT["Meter",1.0]]Other systems — St. Helena
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.