IGNF:RGM04GDD.MAYO53 - RGM04 geographiques (dd) et SHOM 1953 (MAYOTTE)

{
  "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
  "type": "CompoundCRS",
  "name": "RGM04 geographiques (dd) et SHOM 1953 (MAYOTTE)",
  "components": [
    {
      "type": "GeographicCRS",
      "name": "RGM04 geographiques (dd)",
      "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "Reseau Geodesique de Mayotte 2004",
        "ellipsoid": {
          "name": "GRS 1980",
          "semi_major_axis": 6378137,
          "inverse_flattening": 298.257222101
        }
      },
      "coordinate_system": {
        "subtype": "ellipsoidal",
        "axis": [
          {
            "name": "Geodetic longitude",
            "abbreviation": "Lon",
            "direction": "east",
            "unit": "degree"
          },
          {
            "name": "Geodetic latitude",
            "abbreviation": "Lat",
            "direction": "north",
            "unit": "degree"
          }
        ]
      }
    },
    {
      "type": "VerticalCRS",
      "name": "SHOM 1953 (MAYOTTE)",
      "datum": {
        "type": "VerticalReferenceFrame",
        "name": "SHOM 1953 (MAYOTTE)"
      },
      "coordinate_system": {
        "subtype": "vertical",
        "axis": [
          {
            "name": "Gravity-related height",
            "abbreviation": "H",
            "direction": "up",
            "unit": "metre"
          }
        ]
      }
    }
  ],
  "scope": "NATIONALE A CARACTERE LEGAL",
  "area": "ILE DE MAYOTTE",
  "bbox": {
    "south_latitude": -13.05,
    "west_longitude": 44.95,
    "north_latitude": -12.5,
    "east_longitude": 45.4
  },
  "id": {
    "authority": "IGNF",
    "code": "RGM04GDD.MAYO53"
  }
}

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 'geographic_crs_name': 'RGM04 geographiques (dd)',
 'geopotential_datum_name': 'SHOM 1953 (MAYOTTE)',
 'grid_mapping_name': 'latitude_longitude',
 'horizontal_datum_name': 'Reseau Geodesique de Mayotte 2004',
 'inverse_flattening': 298.257222101,
 'longitude_of_prime_meridian': 0.0,
 'prime_meridian_name': 'Greenwich',
 'reference_ellipsoid_name': 'GRS 1980',
 'semi_major_axis': 6378137.0,
 'semi_minor_axis': 6356752.314140356}