IGNF:ED50UTM31.IGN69 - ED50 UTM NORD FUSEAU 31 et NGF-IGN 1969

{
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  "type": "CompoundCRS",
  "name": "ED50 UTM NORD FUSEAU 31 et NGF-IGN 1969",
  "components": [
    {
      "type": "ProjectedCRS",
      "name": "ED50 UTM NORD FUSEAU 31",
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        "name": "ED50 geographiques (dms)",
        "datum": {
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          "name": "European Datum 1950",
          "ellipsoid": {
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            "semi_major_axis": 6378388,
            "inverse_flattening": 297
          }
        },
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              "name": "Geodetic longitude",
              "abbreviation": "Lon",
              "direction": "east",
              "unit": "degree"
            },
            {
              "name": "Geodetic latitude",
              "abbreviation": "Lat",
              "direction": "north",
              "unit": "degree"
            }
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        "id": {
          "authority": "IGNF",
          "code": "ED50G"
        }
      },
      "conversion": {
        "name": "UTM NORD FUSEAU 31",
        "method": {
          "name": "Transverse Mercator",
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          }
        },
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            "name": "Latitude of natural origin",
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            "unit": "degree",
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              "code": 8801
            }
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            "unit": "degree",
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            "unit": "unity",
            "id": {
              "authority": "EPSG",
              "code": 8805
            }
          },
          {
            "name": "False easting",
            "value": 500000,
            "unit": "metre",
            "id": {
              "authority": "EPSG",
              "code": 8806
            }
          },
          {
            "name": "False northing",
            "value": 0,
            "unit": "metre",
            "id": {
              "authority": "EPSG",
              "code": 8807
            }
          }
        ]
      },
      "coordinate_system": {
        "subtype": "Cartesian",
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            "name": "Easting",
            "abbreviation": "X",
            "direction": "east",
            "unit": "metre"
          },
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            "name": "Northing",
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            "unit": "metre"
          }
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    },
    {
      "type": "VerticalCRS",
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        "name": "NGF-IGN 1969"
      },
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        "subtype": "vertical",
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            "name": "Gravity-related height",
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            "direction": "up",
            "unit": "metre"
          }
        ]
      }
    }
  ],
  "scope": "NATIONALE, HISTORIQUE",
  "area": "FRANCE CONTINENTALE (CORSE EXCLUE) - UTM NORD FUSEAU 31",
  "bbox": {
    "south_latitude": 42,
    "west_longitude": 0,
    "north_latitude": 51.5,
    "east_longitude": 6
  },
  "id": {
    "authority": "IGNF",
    "code": "ED50UTM31.IGN69"
  }
}

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 'geographic_crs_name': 'ED50 geographiques (dms)',
 'geopotential_datum_name': 'NGF-IGN 1969',
 'grid_mapping_name': 'transverse_mercator',
 'horizontal_datum_name': 'European Datum 1950',
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 'latitude_of_projection_origin': 0.0,
 'longitude_of_central_meridian': 3.0,
 'longitude_of_prime_meridian': 0.0,
 'prime_meridian_name': 'Greenwich',
 'projected_crs_name': 'ED50 UTM NORD FUSEAU 31',
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 'scale_factor_at_central_meridian': 0.9996,
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