IGNF:UTM20W84MART - RRAF UTM Nord fuseau 20

{
  "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
  "type": "ProjectedCRS",
  "name": "RRAF UTM Nord fuseau 20",
  "base_crs": {
    "name": "RRAF geographiques (dms)",
    "datum": {
      "type": "GeodeticReferenceFrame",
      "name": "Reseau de Reference des Antilles Francaises 1991",
      "ellipsoid": {
        "name": "WGS 84",
        "semi_major_axis": 6378137,
        "inverse_flattening": 298.257223563
      }
    },
    "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": "RRAFG"
    }
  },
  "conversion": {
    "name": "UTM NORD FUSEAU 20",
    "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": -63,
        "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"
      }
    ]
  },
  "scope": "NATIONALE A CARACTERE LEGAL",
  "area": "ANTILLES FRANCAISES - UTM NORD FUSEAU 20",
  "bbox": {
    "south_latitude": 14.25,
    "west_longitude": -63.2,
    "north_latitude": 18.2,
    "east_longitude": -60.73
  },
  "id": {
    "authority": "IGNF",
    "code": "UTM20W84MART"
  }
}

{'crs_wkt': 'PROJCRS["RRAF UTM Nord fuseau 20",BASEGEOGCRS["RRAF geographiques '
            '(dms)",DATUM["Reseau de Reference des Antilles Francaises '
            '1991",ELLIPSOID["WGS '
            '84",6378137,298.257223563,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],ID["IGNF","RRAFG"]],CONVERSION["UTM '
            'NORD FUSEAU 20",METHOD["Transverse '
            'Mercator",ID["EPSG",9807]],PARAMETER["Latitude of natural '
            'origin",0,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8801]],PARAMETER["Longitude '
            'of natural '
            'origin",-63,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]],USAGE[SCOPE["NATIONALE '
            'A CARACTERE LEGAL"],AREA["ANTILLES FRANCAISES - UTM NORD FUSEAU '
            '20"],BBOX[14.25,-63.2,18.2,-60.73]],ID["IGNF","UTM20W84MART"]]',
 'false_easting': 500000.0,
 'false_northing': 0.0,
 'geographic_crs_name': 'RRAF geographiques (dms)',
 'grid_mapping_name': 'transverse_mercator',
 'horizontal_datum_name': 'Reseau de Reference des Antilles Francaises 1991',
 'inverse_flattening': 298.257223563,
 'latitude_of_projection_origin': 0.0,
 'longitude_of_central_meridian': -63.0,
 'longitude_of_prime_meridian': 0.0,
 'prime_meridian_name': 'Greenwich',
 'projected_crs_name': 'RRAF UTM Nord fuseau 20',
 'reference_ellipsoid_name': 'WGS 84',
 'scale_factor_at_central_meridian': 0.9996,
 'semi_major_axis': 6378137.0,
 'semi_minor_axis': 6356752.314245179}