IGNF:LAMB4 - NTF Lambert IV

{
  "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
  "type": "ProjectedCRS",
  "name": "NTF Lambert IV",
  "base_crs": {
    "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
          }
        }
      ]
    },
    "id": {
      "authority": "IGNF",
      "code": "NTFPGRAD"
    }
  },
  "conversion": {
    "name": "LAMBERT IV CORSE",
    "method": {
      "name": "Lambert Conic Conformal (1SP)",
      "id": {
        "authority": "EPSG",
        "code": 9801
      }
    },
    "parameters": [
      {
        "name": "Latitude of natural origin",
        "value": 46.85,
        "unit": {
          "type": "AngularUnit",
          "name": "grad",
          "conversion_factor": 0.0157079632679489
        },
        "id": {
          "authority": "EPSG",
          "code": 8801
        }
      },
      {
        "name": "Longitude of natural origin",
        "value": 0,
        "unit": {
          "type": "AngularUnit",
          "name": "grad",
          "conversion_factor": 0.0157079632679489
        },
        "id": {
          "authority": "EPSG",
          "code": 8802
        }
      },
      {
        "name": "Scale factor at natural origin",
        "value": 0.99994471,
        "unit": "unity",
        "id": {
          "authority": "EPSG",
          "code": 8805
        }
      },
      {
        "name": "False easting",
        "value": 234.358,
        "unit": "metre",
        "id": {
          "authority": "EPSG",
          "code": 8806
        }
      },
      {
        "name": "False northing",
        "value": 185861.369,
        "unit": "metre",
        "id": {
          "authority": "EPSG",
          "code": 8807
        }
      }
    ]
  },
  "coordinate_system": {
    "subtype": "Cartesian",
    "axis": [
      {
        "name": "Easting",
        "abbreviation": "X",
        "direction": "east",
        "unit": "metre"
      },
      {
        "name": "Northing",
        "abbreviation": "Y",
        "direction": "north",
        "unit": "metre"
      }
    ]
  },
  "scope": "NATIONALE, HISTORIQUE",
  "area": "FRANCE METROPOLITAINE (CORSE COMPRISE) - LAMBERT IV CORSE",
  "bbox": {
    "south_latitude": 41.3100821709321,
    "west_longitude": 7.7367772754414,
    "north_latitude": 43.0200472881681,
    "east_longitude": 10
  },
  "id": {
    "authority": "IGNF",
    "code": "LAMB4"
  }
}

{'crs_wkt': 'PROJCRS["NTF Lambert IV",BASEGEOGCRS["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]],ID["IGNF","NTFPGRAD"]],CONVERSION["LAMBERT '
            'IV CORSE",METHOD["Lambert Conic Conformal '
            '(1SP)",ID["EPSG",9801]],PARAMETER["Latitude of natural '
            'origin",46.85,ANGLEUNIT["grad",0.0157079632679489],ID["EPSG",8801]],PARAMETER["Longitude '
            'of natural '
            'origin",0,ANGLEUNIT["grad",0.0157079632679489],ID["EPSG",8802]],PARAMETER["Scale '
            'factor at natural '
            'origin",0.99994471,SCALEUNIT["unity",1],ID["EPSG",8805]],PARAMETER["False '
            'easting",234.358,LENGTHUNIT["metre",1],ID["EPSG",8806]],PARAMETER["False '
            'northing",185861.369,LENGTHUNIT["metre",1],ID["EPSG",8807]]],CS[Cartesian,2],AXIS["easting '
            '(X)",east,ORDER[1],LENGTHUNIT["metre",1]],AXIS["northing '
            '(Y)",north,ORDER[2],LENGTHUNIT["metre",1]],USAGE[SCOPE["NATIONALE, '
            'HISTORIQUE"],AREA["FRANCE METROPOLITAINE (CORSE COMPRISE) - '
            'LAMBERT IV '
            'CORSE"],BBOX[41.3100821709321,7.7367772754414,43.0200472881681,10]],ID["IGNF","LAMB4"]]',
 'false_easting': 234.358,
 'false_northing': 185861.369,
 'geographic_crs_name': 'NTF geographiques Paris (gr)',
 'grid_mapping_name': 'lambert_conformal_conic',
 'horizontal_datum_name': 'Nouvelle Triangulation Francaise (Paris)',
 'inverse_flattening': 293.4660212936269,
 'longitude_of_central_meridian': 0.0,
 'longitude_of_prime_meridian': 2.5969213,
 'prime_meridian_name': 'Paris',
 'projected_crs_name': 'NTF Lambert IV',
 'reference_ellipsoid_name': 'Clarke 1880 (IGN)',
 'semi_major_axis': 6378249.2,
 'semi_minor_axis': 6356515.0,
 'standard_parallel': 46.85}