Ellipsoid: International 1924
Prime meridian: Greenwich
Data source: EPSG
Information source: DMA / NIMA / NGA TR8350.2 (3rd edition, Amendment 1, 3 January 2000) and St. Helena Government, Environment and Natural Resources Directorate (ENRD).
Revision date: 2016-12-15
Scope: Geodesy, topographic mapping.
Area of use: St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore.
WGS84 bounds:
-5.59 -16.08
-5.85 -15.85
Definition: OGC Well Known Text
DATUM["Astro_DOS_71", SPHEROID["International 1924",6378388,297, AUTHORITY["EPSG","7022"]], AUTHORITY["EPSG","6710"]]
Definition: OGC Well Known Text 2 (2019)
DATUM["Astro DOS 71", ELLIPSOID["International 1924",6378388,297, LENGTHUNIT["metre",1]], ID["EPSG",6710]]
Definition: ESRI Well Known Text
DATUM["D_DOS_71_4", SPHEROID["International_1924",6378388.0,297.0]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.5/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "Astro DOS 71", "ellipsoid": { "name": "International 1924", "semi_major_axis": 6378388, "inverse_flattening": 297 }, "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": 6710 } }