Ellipsoid: Clarke 1880 (RGS)
Prime meridian: Greenwich
Data source: EPSG
Information source: IGN Paris.
Revision date: 2015-04-22
Scope: Geodesy.
Remarks: Used as the basis for computation of the 12th Parallel traverse conducted 1966-70 from Senegal to Chad and connecting to the Blue Nile 1958 (Adindan) triangulation in Sudan.
Definition: OGC Well Known Text
DATUM["Point_58", SPHEROID["Clarke 1880 (RGS)",6378249.145,293.465, AUTHORITY["EPSG","7012"]], AUTHORITY["EPSG","6620"]]
Definition: OGC Well Known Text 2 (2019)
DATUM["Point 58", ELLIPSOID["Clarke 1880 (RGS)",6378249.145,293.465, LENGTHUNIT["metre",1]], ID["EPSG",6620]]
Definition: ESRI Well Known Text
DATUM["D_Point_58", SPHEROID["Clarke_1880_RGS",6378249.145,293.465]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.5/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "Point 58", "ellipsoid": { "name": "Clarke 1880 (RGS)", "semi_major_axis": 6378249.145, "inverse_flattening": 293.465 }, "scope": "Geodesy.", "area": "Senegal - central, Mali - southwest, Burkina Faso - central, Niger - southwest, Nigeria - north, Chad - central. All in proximity to the parallel of latitude of 12°N.", "bbox": { "south_latitude": 10.26, "west_longitude": -17.19, "north_latitude": 15.7, "east_longitude": 30.42 }, "id": { "authority": "EPSG", "code": 6620 } }