IGNF:WGS72UTM31.IGN69 - WGS72 UTM fuseau 31 et NGF-IGN 1969

{
  "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
  "type": "CompoundCRS",
  "name": "WGS72 UTM fuseau 31 et NGF-IGN 1969",
  "components": [
    {
      "type": "ProjectedCRS",
      "name": "WGS72 UTM fuseau 31",
      "base_crs": {
        "name": "WGS72 geographiques (dms)",
        "datum": {
          "type": "DynamicGeodeticReferenceFrame",
          "name": "World Geodetic System 1972",
          "frame_reference_epoch": 1972,
          "ellipsoid": {
            "name": "WGS 72",
            "semi_major_axis": 6378135,
            "inverse_flattening": 298.26
          }
        },
        "coordinate_system": {
          "subtype": "ellipsoidal",
          "axis": [
            {
              "name": "Geodetic longitude",
              "abbreviation": "Lon",
              "direction": "east",
              "unit": "degree"
            },
            {
              "name": "Geodetic latitude",
              "abbreviation": "Lat",
              "direction": "north",
              "unit": "degree"
            }
          ]
        },
        "id": {
          "authority": "IGNF",
          "code": "WGS72G"
        }
      },
      "conversion": {
        "name": "UTM NORD FUSEAU 31",
        "method": {
          "name": "Transverse Mercator",
          "id": {
            "authority": "EPSG",
            "code": 9807
          }
        },
        "parameters": [
          {
            "name": "Latitude of natural origin",
            "value": 0,
            "unit": "degree",
            "id": {
              "authority": "EPSG",
              "code": 8801
            }
          },
          {
            "name": "Longitude of natural origin",
            "value": 3,
            "unit": "degree",
            "id": {
              "authority": "EPSG",
              "code": 8802
            }
          },
          {
            "name": "Scale factor at natural origin",
            "value": 0.9996,
            "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",
        "axis": [
          {
            "name": "Easting",
            "abbreviation": "X",
            "direction": "east",
            "unit": "metre"
          },
          {
            "name": "Northing",
            "abbreviation": "Y",
            "direction": "north",
            "unit": "metre"
          }
        ]
      }
    },
    {
      "type": "VerticalCRS",
      "name": "NGF-IGN 1969",
      "datum": {
        "type": "VerticalReferenceFrame",
        "name": "NGF-IGN 1969"
      },
      "coordinate_system": {
        "subtype": "vertical",
        "axis": [
          {
            "name": "Gravity-related height",
            "abbreviation": "H",
            "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": "WGS72UTM31.IGN69"
  }
}

{'crs_wkt': 'COMPOUNDCRS["WGS72 UTM fuseau 31 et NGF-IGN 1969",PROJCRS["WGS72 '
            'UTM fuseau 31",BASEGEOGCRS["WGS72 geographiques '
            '(dms)",DYNAMIC[FRAMEEPOCH[1972]],DATUM["World Geodetic System '
            '1972",ELLIPSOID["WGS '
            '72",6378135,298.26,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],ID["IGNF","WGS72G"]],CONVERSION["UTM '
            'NORD FUSEAU 31",METHOD["Transverse '
            'Mercator",ID["EPSG",9807]],PARAMETER["Latitude of natural '
            'origin",0,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8801]],PARAMETER["Longitude '
            'of natural '
            'origin",3,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8802]],PARAMETER["Scale '
            'factor at natural '
            'origin",0.9996,SCALEUNIT["unity",1],ID["EPSG",8805]],PARAMETER["False '
            'easting",500000,LENGTHUNIT["metre",1],ID["EPSG",8806]],PARAMETER["False '
            'northing",0,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]]],VERTCRS["NGF-IGN '
            '1969",VDATUM["NGF-IGN 1969"],CS[vertical,1],AXIS["gravity-related '
            'height (H)",up,LENGTHUNIT["metre",1]]],USAGE[SCOPE["NATIONALE, '
            'HISTORIQUE"],AREA["FRANCE CONTINENTALE (CORSE EXCLUE) - UTM NORD '
            'FUSEAU 31"],BBOX[42,0,51.5,6]],ID["IGNF","WGS72UTM31.IGN69"]]',
 'false_easting': 500000.0,
 'false_northing': 0.0,
 'geographic_crs_name': 'WGS72 geographiques (dms)',
 'geopotential_datum_name': 'NGF-IGN 1969',
 'grid_mapping_name': 'transverse_mercator',
 'horizontal_datum_name': 'World Geodetic System 1972',
 'inverse_flattening': 298.26,
 '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': 'WGS72 UTM fuseau 31',
 'reference_ellipsoid_name': 'WGS 72',
 'scale_factor_at_central_meridian': 0.9996,
 'semi_major_axis': 6378135.0,
 'semi_minor_axis': 6356750.520016094}