EPSG
EPSG Guidance Note #7-2.
2005-09-12
Geographic 3D to geographic 2D conversions.
See EPSG Guidance Note #7 or Coordinate Operation Method description for techniques for handling reverse conversion.
France - onshore and offshore, mainland and Corsica (France métropolitaine including Corsica).
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Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "Conversion", "name": "RGF93 geog3D to geog2D", "method": { "name": "Geographic3D to 2D conversion", "id": { "authority": "EPSG", "code": 9659 } }, "id": { "authority": "EPSG", "code": 15535 } }