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Unit: metre
Data source: EPSG
Revision date: 1998-04-16
Remarks: Adopts Clarke's values for a and b using his 1865 ratio of 39.370432 inches per metre to convert axes to metres.
Definition: OGC Well Known Text
SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627, AUTHORITY["EPSG","7011"]]
Definition: OGC Well Known Text 2 (2019)
ELLIPSOID["Clarke 1880 (IGN)",6378249.2,293.466021293627, LENGTHUNIT["metre",1], ID["EPSG",7011]]
Definition: ESRI Well Known Text
SPHEROID["Clarke_1880_IGN",6378249.2,293.466021293627]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "Ellipsoid", "name": "Clarke 1880 (IGN)", "semi_major_axis": 6378249.2, "semi_minor_axis": 6356515, "id": { "authority": "EPSG", "code": 7011 } }
Definition: GeoServer
7011-ellipsoid=SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627,AUTHORITY["EPSG","7011"]]