Ellipsoid: GRS 1980
Prime meridian: Greenwich
Data source: EPSG
Information source: St. Helena Government, Environment and Natural Resources Directorate (ENRD).
Revision date: 2016-11-29
Scope: Geodesy, topographic mapping.
Remarks: Developed by Richard Stanaway, Quickclose Pty Ltd, superseding Astro DOS 71 from 1st January 2016.
Area of use: St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore.
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "St. Helena Geodetic Datum 2015", "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 }, "scope": "Geodesy, topographic mapping.", "area": "St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore.", "bbox": { "south_latitude": -16.08, "west_longitude": -5.85, "north_latitude": -15.85, "east_longitude": -5.59 }, "id": { "authority": "EPSG", "code": 1174 } }