St. Helena: coordinate systems
10 current national systems, and 0 regional or world-wide systems that also cover this country. Every code opens its page: definition, parameters, proj4, WKT.
Projected systems 5
Plane X/Y coordinates (Easting, Northing), most often in metres: what plans, cadastre and surveys use.
| Code | Name | Conversion |
|---|---|---|
| EPSG:7877 | Astro DOS 71 / SHLG71 | Converts here |
| EPSG:7878 | Astro DOS 71 / UTM zone 30S | Converts here |
| EPSG:7882 | St. Helena Tritan / SHLG(Tritan) | Converts here |
| EPSG:7883 | St. Helena Tritan / UTM zone 30S | Converts here |
| EPSG:7887 | SHMG2015 | Converts here |
Geographic systems 5
Latitude and longitude on the ellipsoid of a datum. They underlie the projected systems of the same datum.
| Code | Name | Conversion |
|---|---|---|
| EPSG:4710 | Astro DOS 71 | Converts here |
| EPSG:4712 | Ascension Island 1958 | Converts here |
| EPSG:4734 | Tristan 1968 | Converts here |
| EPSG:7881 | St. Helena Tritan | Converts here |
| EPSG:7886 | SHGD2015 | Converts here |
Which system should I use?
For a plan or a survey in this country, use the national system named by the specification or the cadastre. A UTM zone suits a project that spills over national zones; WGS 84 (EPSG:4326) is for exchanging with a GPS.