IGNF:NTFPGRAD.NGC48 - NTF geographiques Paris (gr) et NIVELLEMENT GENERAL DE LA CORSE (NGC)

{
  "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
  "type": "CompoundCRS",
  "name": "NTF geographiques Paris (gr) et NIVELLEMENT GENERAL DE LA CORSE (NGC)",
  "components": [
    {
      "type": "GeographicCRS",
      "name": "NTF geographiques Paris (gr)",
      "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "Nouvelle Triangulation Francaise (Paris)",
        "ellipsoid": {
          "name": "Clarke 1880 (IGN)",
          "semi_major_axis": 6378249.2,
          "semi_minor_axis": 6356515
        },
        "prime_meridian": {
          "name": "Paris",
          "longitude": {
            "value": 2.5969213,
            "unit": {
              "type": "AngularUnit",
              "name": "grad",
              "conversion_factor": 0.0157079632679489
            }
          }
        }
      },
      "coordinate_system": {
        "subtype": "ellipsoidal",
        "axis": [
          {
            "name": "Geodetic longitude",
            "abbreviation": "Lon",
            "direction": "east",
            "unit": {
              "type": "AngularUnit",
              "name": "grad",
              "conversion_factor": 0.0157079632679489
            }
          },
          {
            "name": "Geodetic latitude",
            "abbreviation": "Lat",
            "direction": "north",
            "unit": {
              "type": "AngularUnit",
              "name": "grad",
              "conversion_factor": 0.0157079632679489
            }
          }
        ]
      }
    },
    {
      "type": "VerticalCRS",
      "name": "NIVELLEMENT GENERAL DE LA CORSE (NGC)",
      "datum": {
        "type": "VerticalReferenceFrame",
        "name": "NIVELLEMENT GENERAL DE LA CORSE (NGC)"
      },
      "coordinate_system": {
        "subtype": "vertical",
        "axis": [
          {
            "name": "Gravity-related height",
            "abbreviation": "H",
            "direction": "up",
            "unit": "metre"
          }
        ]
      }
    }
  ],
  "scope": "LOCALE, HISTORIQUE",
  "area": "CORSE",
  "bbox": {
    "south_latitude": 41.2,
    "west_longitude": 8,
    "north_latitude": 43.5,
    "east_longitude": 10
  },
  "id": {
    "authority": "IGNF",
    "code": "NTFPGRAD.NGC48"
  }
}

{'crs_wkt': 'COMPOUNDCRS["NTF geographiques Paris (gr) et NIVELLEMENT GENERAL '
            'DE LA CORSE (NGC)",GEOGCRS["NTF geographiques Paris '
            '(gr)",DATUM["Nouvelle Triangulation Francaise '
            '(Paris)",ELLIPSOID["Clarke 1880 '
            '(IGN)",6378249.2,293.466021293627,LENGTHUNIT["metre",1]]],PRIMEM["Paris",2.5969213,ANGLEUNIT["grad",0.0157079632679489]],CS[ellipsoidal,2],AXIS["geodetic '
            'longitude '
            '(Lon)",east,ORDER[1],ANGLEUNIT["grad",0.0157079632679489]],AXIS["geodetic '
            'latitude '
            '(Lat)",north,ORDER[2],ANGLEUNIT["grad",0.0157079632679489]]],VERTCRS["NIVELLEMENT '
            'GENERAL DE LA CORSE (NGC)",VDATUM["NIVELLEMENT GENERAL DE LA '
            'CORSE (NGC)"],CS[vertical,1],AXIS["gravity-related height '
            '(H)",up,LENGTHUNIT["metre",1]]],USAGE[SCOPE["LOCALE, '
            'HISTORIQUE"],AREA["CORSE"],BBOX[41.2,8,43.5,10]],ID["IGNF","NTFPGRAD.NGC48"]]',
 'geographic_crs_name': 'NTF geographiques Paris (gr)',
 'geopotential_datum_name': 'NIVELLEMENT GENERAL DE LA CORSE (NGC)',
 'grid_mapping_name': 'latitude_longitude',
 'horizontal_datum_name': 'Nouvelle Triangulation Francaise (Paris)',
 'inverse_flattening': 293.466021293627,
 'longitude_of_prime_meridian': 2.5969213,
 'prime_meridian_name': 'Paris',
 'reference_ellipsoid_name': 'Clarke 1880 (IGN)',
 'semi_major_axis': 6378249.2,
 'semi_minor_axis': 6356515.0}